diff --git a/.cursor/rules/project-conventions.mdc b/.cursor/rules/project-conventions.mdc
index 2ac70891a..835451c28 100644
--- a/.cursor/rules/project-conventions.mdc
+++ b/.cursor/rules/project-conventions.mdc
@@ -18,8 +18,7 @@ This rule serves as high-level documentation for how you should write code for t
 - Jobs: Sidekiq + Redis
 - External
   - Payments: Stripe
-  - User bank data syncing: Plaid 
-  - Market data: Synth (our custom API)
+  - User bank data syncing: Plaid
 
 ## Project conventions
 
diff --git a/.cursor/rules/project-design.mdc b/.cursor/rules/project-design.mdc
index 4b60f2f9e..3c4ea3471 100644
--- a/.cursor/rules/project-design.mdc
+++ b/.cursor/rules/project-design.mdc
@@ -158,20 +158,11 @@ app/models/
     registry.rb <- Defines available providers by concept
     concepts/
       exchange_rate.rb <- defines the interface required for the exchange rate concept
-    synth.rb # <- Concrete provider implementation
 ```
 
 ### One-off data
 
-For data that does not fit neatly into a "concept", an interface is not required and the concrete provider may implement ad-hoc methods called directly in code.  For example, the [synth.rb](mdc:app/models/provider/synth.rb) provider has a `usage` method that is only applicable to this specific provider.  This should be called directly without any abstractions:
-
-```rb
-class SomeModel < Application
-  def synth_usage
-    Provider::Registry.get_provider(:synth)&.usage
-  end
-end
-```
+For data that does not fit neatly into a "concept", an interface is not required and the concrete provider may implement ad-hoc methods called directly in code.
 
 ## "Provided" Concerns
 
diff --git a/.env.example b/.env.example
index ab12d9077..00bde4ad0 100644
--- a/.env.example
+++ b/.env.example
@@ -17,10 +17,6 @@ SECRET_KEY_BASE=secret-value
 # Optional self-hosting vars
 # --------------------------------------------------------------------------------------------------------
 
-# Optional: Synth API Key for exchange rates + stock prices
-# (you can also set this in your self-hosted settings page)
-# Get it here: https://synthfinance.com/
-SYNTH_API_KEY=
 
 # Optional: Twelve Data API Key for exchange rates + stock prices
 # (you can also set this in your self-hosted settings page)
diff --git a/.env.local.example b/.env.local.example
index 88ce74ded..abe6c2d91 100644
--- a/.env.local.example
+++ b/.env.local.example
@@ -1,6 +1,5 @@
 # To enable / disable self-hosting features.
 SELF_HOSTED=false
 
-# Enable Synth market data (careful, this will use your API credits)
-SYNTH_API_KEY=yourapikeyhere
+# Enable Twelve market data (careful, this will use your API credits)
 TWELVE_DATA_API_KEY=yourapikeyhere
diff --git a/.env.test.example b/.env.test.example
index 37fb9ef92..f42af1685 100644
--- a/.env.test.example
+++ b/.env.test.example
@@ -6,7 +6,6 @@ SELF_HOSTED=false
 # Uncomment and fill in live keys when you need to generate a VCR cassette fixture
 # ================
 
-# SYNTH_API_KEY=<add live key here>
 
 # ================
 # Miscellaneous
diff --git a/CLAUDE.md b/CLAUDE.md
index ed57f55c8..e67a52e61 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -115,7 +115,6 @@ Sidekiq handles asynchronous tasks:
 
 ### Multi-Currency Support
 - All monetary values stored in base currency (user's primary currency)
-- Exchange rates fetched from Synth API
 - `Money` objects handle currency conversion and formatting
 - Historical exchange rates for accurate reporting
 
diff --git a/app/controllers/settings/hostings_controller.rb b/app/controllers/settings/hostings_controller.rb
index 6702bbb94..beda30f75 100644
--- a/app/controllers/settings/hostings_controller.rb
+++ b/app/controllers/settings/hostings_controller.rb
@@ -6,9 +6,6 @@ class Settings::HostingsController < ApplicationController
   before_action :ensure_admin, only: :clear_cache
 
   def show
-    synth_provider = Provider::Registry.get_provider(:synth)
-    @synth_usage = synth_provider&.usage
-
     twelve_data_provider = Provider::Registry.get_provider(:twelve_data)
     @twelve_data_usage = twelve_data_provider&.usage
   end
@@ -22,10 +19,6 @@ class Settings::HostingsController < ApplicationController
       Setting.require_email_confirmation = hosting_params[:require_email_confirmation]
     end
 
-    if hosting_params.key?(:synth_api_key)
-      Setting.synth_api_key = hosting_params[:synth_api_key]
-    end
-
     if hosting_params.key?(:twelve_data_api_key)
       Setting.twelve_data_api_key = hosting_params[:twelve_data_api_key]
     end
@@ -43,7 +36,7 @@ class Settings::HostingsController < ApplicationController
 
   private
     def hosting_params
-      params.require(:setting).permit(:require_invite_for_signup, :require_email_confirmation, :synth_api_key, :twelve_data_api_key)
+      params.require(:setting).permit(:require_invite_for_signup, :require_email_confirmation, :twelve_data_api_key)
     end
 
     def ensure_admin
diff --git a/app/models/family/auto_merchant_detector.rb b/app/models/family/auto_merchant_detector.rb
index 39e58a3ad..bea5dab32 100644
--- a/app/models/family/auto_merchant_detector.rb
+++ b/app/models/family/auto_merchant_detector.rb
@@ -36,9 +36,7 @@ class Family::AutoMerchantDetector
           source: "ai",
           name: auto_detection.business_name,
           website_url: auto_detection.business_url,
-        ) do |pm|
-          pm.logo_url = "#{default_logo_provider_url}/#{auto_detection.business_url}"
-        end
+        )
       end
 
       merchant_id = merchant_id || ai_provider_merchant&.id
@@ -65,9 +63,6 @@ class Family::AutoMerchantDetector
       Provider::Registry.get_provider(:openai)
     end
 
-    def default_logo_provider_url
-      "https://logo.synthfinance.com"
-    end
 
     def user_merchants_input
       family.merchants.map do |merchant|
diff --git a/app/models/provider/registry.rb b/app/models/provider/registry.rb
index 9d6de82f3..aeb77a81a 100644
--- a/app/models/provider/registry.rb
+++ b/app/models/provider/registry.rb
@@ -32,14 +32,6 @@ class Provider::Registry
         Provider::Stripe.new(secret_key:, webhook_secret:)
       end
 
-      def synth
-        api_key = ENV.fetch("SYNTH_API_KEY", Setting.synth_api_key)
-
-        return nil unless api_key.present?
-
-        Provider::Synth.new(api_key)
-      end
-
       def twelve_data
         api_key = ENV.fetch("TWELVE_DATA_API_KEY", Setting.twelve_data_api_key)
 
@@ -100,13 +92,13 @@ class Provider::Registry
     def available_providers
       case concept
       when :exchange_rates
-        %i[synth twelve_data]
+        %i[twelve_data]
       when :securities
-        %i[synth twelve_data]
+        %i[twelve_data]
       when :llm
         %i[openai]
       else
-        %i[synth plaid_us plaid_eu github openai]
+        %i[plaid_us plaid_eu github openai]
       end
     end
 end
diff --git a/app/models/provider/synth.rb b/app/models/provider/synth.rb
deleted file mode 100644
index ed2514ace..000000000
--- a/app/models/provider/synth.rb
+++ /dev/null
@@ -1,250 +0,0 @@
-class Provider::Synth < Provider
-  include ExchangeRateConcept, SecurityConcept
-
-  # Subclass so errors caught in this provider are raised as Provider::Synth::Error
-  Error = Class.new(Provider::Error)
-  InvalidExchangeRateError = Class.new(Error)
-  InvalidSecurityPriceError = Class.new(Error)
-
-  def initialize(api_key)
-    @api_key = api_key
-  end
-
-  def healthy?
-    with_provider_response do
-      response = client.get("#{base_url}/user")
-      JSON.parse(response.body).dig("id").present?
-    end
-  end
-
-  def usage
-    with_provider_response do
-      response = client.get("#{base_url}/user")
-
-      parsed = JSON.parse(response.body)
-
-      remaining = parsed.dig("api_calls_remaining")
-      limit = parsed.dig("api_limit")
-      used = limit - remaining
-
-      UsageData.new(
-        used: used,
-        limit: limit,
-        utilization: used.to_f / limit * 100,
-        plan: parsed.dig("plan"),
-      )
-    end
-  end
-
-  # ================================
-  #          Exchange Rates
-  # ================================
-
-  def fetch_exchange_rate(from:, to:, date:)
-    with_provider_response do
-      response = client.get("#{base_url}/rates/historical") do |req|
-        req.params["date"] = date.to_s
-        req.params["from"] = from
-        req.params["to"] = to
-      end
-
-      rates = JSON.parse(response.body).dig("data", "rates")
-
-      Rate.new(date: date.to_date, from:, to:, rate: rates.dig(to))
-    end
-  end
-
-  def fetch_exchange_rates(from:, to:, start_date:, end_date:)
-    with_provider_response do
-      data = paginate(
-        "#{base_url}/rates/historical-range",
-        from: from,
-        to: to,
-        date_start: start_date.to_s,
-        date_end: end_date.to_s
-      ) do |body|
-        body.dig("data")
-      end
-
-      data.paginated.map do |rate|
-        date = rate.dig("date")
-        rate = rate.dig("rates", to)
-
-        if date.nil? || rate.nil?
-          Rails.logger.warn("#{self.class.name} returned invalid rate data for pair from: #{from} to: #{to} on: #{date}.  Rate data: #{rate.inspect}")
-          Sentry.capture_exception(InvalidExchangeRateError.new("#{self.class.name} returned invalid rate data"), level: :warning) do |scope|
-            scope.set_context("rate", { from: from, to: to, date: date })
-          end
-
-          next
-        end
-
-        Rate.new(date: date.to_date, from:, to:, rate:)
-      end.compact
-    end
-  end
-
-  # ================================
-  #           Securities
-  # ================================
-
-  def search_securities(symbol, country_code: nil, exchange_operating_mic: nil)
-    with_provider_response do
-      response = client.get("#{base_url}/tickers/search") do |req|
-        req.params["name"] = symbol
-        req.params["dataset"] = "limited"
-        req.params["country_code"] = country_code if country_code.present?
-        # Synth uses mic_code, which encompasses both exchange_mic AND exchange_operating_mic (union)
-        req.params["mic_code"] = exchange_operating_mic if exchange_operating_mic.present?
-        req.params["limit"] = 25
-      end
-
-      parsed = JSON.parse(response.body)
-
-      parsed.dig("data").map do |security|
-        Security.new(
-          symbol: security.dig("symbol"),
-          name: security.dig("name"),
-          logo_url: security.dig("logo_url"),
-          exchange_operating_mic: security.dig("exchange", "operating_mic_code"),
-          country_code: security.dig("exchange", "country_code")
-        )
-      end
-    end
-  end
-
-  def fetch_security_info(symbol:, exchange_operating_mic:)
-    with_provider_response do
-      response = client.get("#{base_url}/tickers/#{symbol}") do |req|
-        req.params["operating_mic"] = exchange_operating_mic
-      end
-
-      data = JSON.parse(response.body).dig("data")
-
-      SecurityInfo.new(
-        symbol: symbol,
-        name: data.dig("name"),
-        links: data.dig("links"),
-        logo_url: data.dig("logo_url"),
-        description: data.dig("description"),
-        kind: data.dig("kind"),
-        exchange_operating_mic: exchange_operating_mic
-      )
-    end
-  end
-
-  def fetch_security_price(symbol:, exchange_operating_mic: nil, date:)
-    with_provider_response do
-      historical_data = fetch_security_prices(symbol:, exchange_operating_mic:, start_date: date, end_date: date)
-
-      raise ProviderError, "No prices found for security #{symbol} on date #{date}" if historical_data.data.empty?
-
-      historical_data.data.first
-    end
-  end
-
-  def fetch_security_prices(symbol:, exchange_operating_mic: nil, start_date:, end_date:)
-    with_provider_response do
-      params = {
-        start_date: start_date,
-        end_date: end_date,
-        operating_mic_code: exchange_operating_mic
-      }.compact
-
-      data = paginate(
-        "#{base_url}/tickers/#{symbol}/open-close",
-        params
-      ) do |body|
-        body.dig("prices")
-      end
-
-      currency = data.first_page.dig("currency")
-      exchange_operating_mic = data.first_page.dig("exchange", "operating_mic_code")
-
-      data.paginated.map do |price|
-        date = price.dig("date")
-        price = price.dig("close") || price.dig("open")
-
-        if date.nil? || price.nil?
-          Rails.logger.warn("#{self.class.name} returned invalid price data for security #{symbol} on: #{date}.  Price data: #{price.inspect}")
-          Sentry.capture_exception(InvalidSecurityPriceError.new("#{self.class.name} returned invalid security price data"), level: :warning) do |scope|
-            scope.set_context("security", { symbol: symbol, date: date })
-          end
-
-          next
-        end
-
-        Price.new(
-          symbol: symbol,
-          date: date.to_date,
-          price: price,
-          currency: currency,
-          exchange_operating_mic: exchange_operating_mic
-        )
-      end.compact
-    end
-  end
-
-  private
-    attr_reader :api_key
-
-    def base_url
-      ENV["SYNTH_URL"] || "https://api.synthfinance.com"
-    end
-
-    def app_name
-      "maybe_app"
-    end
-
-    def app_type
-      Rails.application.config.app_mode
-    end
-
-    def client
-      @client ||= Faraday.new(url: base_url) do |faraday|
-        faraday.request(:retry, {
-          max: 2,
-          interval: 0.05,
-          interval_randomness: 0.5,
-          backoff_factor: 2
-        })
-
-        faraday.response :raise_error
-        faraday.headers["Authorization"] = "Bearer #{api_key}"
-        faraday.headers["X-Source"] = app_name
-        faraday.headers["X-Source-Type"] = app_type
-      end
-    end
-
-    def fetch_page(url, page, params = {})
-      client.get(url, params.merge(page: page))
-    end
-
-    def paginate(url, params = {})
-      results = []
-      page = 1
-      current_page = 0
-      total_pages = 1
-      first_page = nil
-
-      while current_page < total_pages
-        response = fetch_page(url, page, params)
-
-        body = JSON.parse(response.body)
-        first_page = body unless first_page
-        page_results = yield(body)
-        results.concat(page_results)
-
-        current_page = body.dig("paging", "current_page")
-        total_pages = body.dig("paging", "total_pages")
-
-        page += 1
-      end
-
-      PaginatedData.new(
-        paginated: results,
-        first_page: first_page,
-        total_pages: total_pages
-      )
-    end
-end
diff --git a/app/models/security.rb b/app/models/security.rb
index b6e852956..ca5b38c4b 100644
--- a/app/models/security.rb
+++ b/app/models/security.rb
@@ -18,7 +18,7 @@ class Security < ApplicationRecord
   end
 
   def to_combobox_option
-    SynthComboboxOption.new(
+    ComboboxOption.new(
       symbol: ticker,
       name: name,
       logo_url: logo_url,
diff --git a/app/models/security/combobox_option.rb b/app/models/security/combobox_option.rb
new file mode 100644
index 000000000..822fc635f
--- /dev/null
+++ b/app/models/security/combobox_option.rb
@@ -0,0 +1,13 @@
+class Security::ComboboxOption
+  include ActiveModel::Model
+
+  attr_accessor :symbol, :name, :logo_url, :exchange_operating_mic, :country_code
+
+  def id
+    "#{symbol}|#{exchange_operating_mic}"
+  end
+
+  def to_combobox_display
+    "#{symbol} - #{name} (#{exchange_operating_mic})"
+  end
+end
diff --git a/app/models/security/synth_combobox_option.rb b/app/models/security/synth_combobox_option.rb
deleted file mode 100644
index 15e769204..000000000
--- a/app/models/security/synth_combobox_option.rb
+++ /dev/null
@@ -1,13 +0,0 @@
-class Security::SynthComboboxOption
-  include ActiveModel::Model
-
-  attr_accessor :symbol, :name, :logo_url, :exchange_operating_mic, :country_code
-
-  def id
-    "#{symbol}|#{exchange_operating_mic}" # submitted by combobox as value
-  end
-
-  def to_combobox_display
-    "#{symbol} - #{name} (#{exchange_operating_mic})" # shown in combobox input when selected
-  end
-end
diff --git a/app/models/setting.rb b/app/models/setting.rb
index 522ddb7c8..fa3dba1b4 100644
--- a/app/models/setting.rb
+++ b/app/models/setting.rb
@@ -2,7 +2,6 @@
 class Setting < RailsSettings::Base
   cache_prefix { "v1" }
 
-  field :synth_api_key, type: :string, default: ENV["SYNTH_API_KEY"]
   field :twelve_data_api_key, type: :string, default: ENV["TWELVE_DATA_API_KEY"]
   field :openai_access_token, type: :string, default: ENV["OPENAI_ACCESS_TOKEN"]
 
diff --git a/app/models/trade/create_form.rb b/app/models/trade/create_form.rb
index ed26d9b65..b07cc87d8 100644
--- a/app/models/trade/create_form.rb
+++ b/app/models/trade/create_form.rb
@@ -18,7 +18,7 @@ class Trade::CreateForm
   end
 
   private
-    # Users can either look up a ticker from our provider (Synth) or enter a manual, "offline" ticker (that we won't fetch prices for)
+    # Users can either look up a ticker from a provider or enter a manual, "offline" ticker (that we won't fetch prices for)
     def security
       ticker_symbol, exchange_operating_mic = ticker.present? ? ticker.split("|") : [ manual_ticker, nil ]
 
diff --git a/app/views/accounts/_logo.html.erb b/app/views/accounts/_logo.html.erb
index 1da8e0bcf..40d9d4d0a 100644
--- a/app/views/accounts/_logo.html.erb
+++ b/app/views/accounts/_logo.html.erb
@@ -7,9 +7,7 @@
   "full" => "w-full h-full"
 } %>
 
-<% if account.plaid_account_id? && account.institution_domain.present? %>
-  <%= image_tag "https://logo.synthfinance.com/#{account.institution_domain}", class: "shrink-0 rounded-full #{size_classes[size]}" %>
-<% elsif account.logo.attached? %>
+<% if account.logo.attached? %>
   <%= image_tag account.logo, class: "shrink-0 rounded-full #{size_classes[size]}" %>
 <% else %>
   <%= render DS::FilledIcon.new(variant: :text, hex_color: color || account.accountable.color, text: account.name, size: size, rounded: true) %>
diff --git a/app/views/holdings/_holding.html.erb b/app/views/holdings/_holding.html.erb
index 5fe0e4c94..3b58fe284 100644
--- a/app/views/holdings/_holding.html.erb
+++ b/app/views/holdings/_holding.html.erb
@@ -3,7 +3,9 @@
 <%= turbo_frame_tag dom_id(holding) do %>
   <div class="grid grid-cols-12 items-center text-primary text-sm font-medium p-4">
     <div class="col-span-4 flex items-center gap-4">
-      <%= image_tag "https://logo.synthfinance.com/ticker/#{holding.ticker}", class: "w-9 h-9 rounded-full", loading: "lazy" %>
+      <% if holding.security.logo_url.present? %>
+        <%= image_tag holding.security.logo_url, class: "w-9 h-9 rounded-full", loading: "lazy" %>
+      <% end %>
 
       <div class="space-y-0.5">
         <%= link_to holding.name, holding_path(holding), data: { turbo_frame: :drawer }, class: "hover:underline" %>
diff --git a/app/views/holdings/show.html.erb b/app/views/holdings/show.html.erb
index d53e5c52b..1a612643d 100644
--- a/app/views/holdings/show.html.erb
+++ b/app/views/holdings/show.html.erb
@@ -6,7 +6,9 @@
         <%= tag.p @holding.ticker, class: "text-sm text-secondary" %>
       </div>
 
-      <%= image_tag "https://logo.synthfinance.com/ticker/#{@holding.ticker}", loading: "lazy", class: "w-9 h-9 rounded-full" %>
+      <% if @holding.security.logo_url.present? %>
+        <%= image_tag @holding.security.logo_url, loading: "lazy", class: "w-9 h-9 rounded-full" %>
+      <% end %>
     </div>
   <% end %>
 
diff --git a/app/views/settings/hostings/_synth_settings.html.erb b/app/views/settings/hostings/_synth_settings.html.erb
deleted file mode 100644
index d8f718396..000000000
--- a/app/views/settings/hostings/_synth_settings.html.erb
+++ /dev/null
@@ -1,49 +0,0 @@
-<div class="space-y-4">
-  <div>
-    <h2 class="font-medium mb-1"><%= t(".title") %></h2>
-    <% if ENV["SYNTH_API_KEY"].present? %>
-      <p class="text-sm text-secondary">You have successfully configured your Synth API key through the SYNTH_API_KEY environment variable.</p>
-    <% else %>
-      <p class="text-secondary text-sm mb-4"><%= t(".description") %></p>
-    <% end %>
-  </div>
-
-  <%= styled_form_with model: Setting.new,
-                       url: settings_hosting_path,
-                       method: :patch,
-                       data: {
-                         controller: "auto-submit-form",
-                         "auto-submit-form-trigger-event-value": "blur"
-                       } do |form| %>
-    <%= form.text_field :synth_api_key,
-                        label: t(".label"),
-                        type: "password",
-                        placeholder: t(".placeholder"),
-                        value: ENV.fetch("SYNTH_API_KEY", Setting.synth_api_key),
-                        disabled: ENV["SYNTH_API_KEY"].present?,
-                        container_class: @synth_usage.present? && !@synth_usage.success? ? "border-red-500" : "",
-                        data: { "auto-submit-form-target": "auto" } %>
-  <% end %>
-
-  <% if @synth_usage.present? && @synth_usage.success? %>
-    <div class="space-y-4">
-      <div class="space-y-2">
-        <p class="text-sm text-secondary">
-          <%= t(".api_calls_used",
-                used: number_with_delimiter(@synth_usage.data.used),
-                limit: number_with_delimiter(@synth_usage.data.limit),
-                percentage: number_to_percentage(@synth_usage.data.utilization, precision: 1)) %>
-        </p>
-        <div class="w-52 h-1.5 bg-gray-100 rounded-2xl">
-          <div class="h-full bg-green-500 rounded-2xl"
-               style="width: <%= [@synth_usage.data.utilization, 2].max %>%;"></div>
-        </div>
-      </div>
-      <div class="bg-gray-100 rounded-md px-1.5 py-0.5 w-fit">
-        <p class="text-xs font-medium text-secondary uppercase">
-          <%= t(".plan", plan: @synth_usage.data.plan) %>
-        </p>
-      </div>
-    </div>
-  <% end %>
-</div>
diff --git a/app/views/settings/hostings/show.html.erb b/app/views/settings/hostings/show.html.erb
index 0b2a19164..adea00382 100644
--- a/app/views/settings/hostings/show.html.erb
+++ b/app/views/settings/hostings/show.html.erb
@@ -1,9 +1,6 @@
 <%= content_for :page_title, t(".title") %>
 
 <%= settings_section title: t(".general") do %>
-  <div class="space-y-6">
-    <%= render "settings/hostings/synth_settings" %>
-  </div>
   <div class="space-y-6">
     <%= render "settings/hostings/twelve_data_settings" %>
   </div>
diff --git a/config/locales/views/settings/hostings/en.yml b/config/locales/views/settings/hostings/en.yml
index c93647646..4289abe65 100644
--- a/config/locales/views/settings/hostings/en.yml
+++ b/config/locales/views/settings/hostings/en.yml
@@ -21,13 +21,6 @@ en:
         confirm_clear_cache:
           title: Clear data cache?
           body: Are you sure you want to clear the data cache? This will remove all exchange rates, security prices, account balances, and other data. This action cannot be undone.
-      synth_settings:
-        api_calls_used: "%{used} / %{limit} API calls used (%{percentage})"
-        description: Input the API key provided by Synth
-        label: API Key
-        placeholder: Enter your API key here
-        plan: "%{plan} plan"
-        title: Synth Settings
       twelve_data_settings:
         api_calls_used: "%{used} / %{limit} API daily calls used (%{percentage})"
         description: Input the API key provided by Twelve Data
diff --git a/config/locales/views/settings/hostings/nb.yml b/config/locales/views/settings/hostings/nb.yml
index 6088e055d..f58758206 100644
--- a/config/locales/views/settings/hostings/nb.yml
+++ b/config/locales/views/settings/hostings/nb.yml
@@ -20,13 +20,6 @@ nb:
         confirm_clear_cache:
           title: Tøm cache?
           body: Er du sikker på at du vil tømme cache? Dette vil fjerne alle valutakurser, verdipapirpriser, kontobalanser og andre data. Denne handlingen kan ikke angres.
-      synth_settings:
-        api_calls_used: "%{used} / %{limit} API-kall brukt (%{percentage})"
-        description: Angi API-nøkkelen som er gitt av Synth
-        label: API-nøkkel
-        placeholder: Angi API-nøkkelen din her
-        plan: "%{plan} plan"
-        title: Synth-innstillinger
       update:
         failure: Ugyldig innstillingsverdi
         success: Innstillinger oppdatert
diff --git a/lib/tasks/securities.rake b/lib/tasks/securities.rake
index 4254b8c64..808df1924 100644
--- a/lib/tasks/securities.rake
+++ b/lib/tasks/securities.rake
@@ -1,64 +1,6 @@
 # frozen_string_literal: true
 
 namespace :securities do
-  desc "Backfill exchange_operating_mic for securities using Synth API"
-  task backfill_exchange_mic: :environment do
-    puts "Starting exchange_operating_mic backfill..."
-
-    api_key = Rails.application.config.app_mode.self_hosted? ? Setting.synth_api_key : ENV["SYNTH_API_KEY"]
-    unless api_key.present?
-      puts "ERROR: No Synth API key found. Please set SYNTH_API_KEY env var or configure it in Settings for self-hosted mode."
-      exit 1
-    end
-
-    securities = Security.where(exchange_operating_mic: nil).where.not(ticker: nil)
-    total = securities.count
-    processed = 0
-    errors = []
-
-    securities.find_each do |security|
-      processed += 1
-      print "\rProcessing #{processed}/#{total} (#{(processed.to_f/total * 100).round(1)}%)"
-
-      begin
-        response = Faraday.get("https://api.synthfinance.com/tickers/#{security.ticker}") do |req|
-          req.params["country_code"] = security.country_code if security.country_code.present?
-          req.headers["Authorization"] = "Bearer #{api_key}"
-        end
-
-        if response.success?
-          data = JSON.parse(response.body).dig("data")
-          exchange_data = data["exchange"]
-
-          # Update security with exchange info and other metadata
-          security.update!(
-            exchange_operating_mic: exchange_data["operating_mic_code"],
-            exchange_mic: exchange_data["mic_code"],
-            exchange_acronym: exchange_data["acronym"],
-            name: data["name"],
-            logo_url: data["logo_url"],
-            country_code: exchange_data["country_code"]
-          )
-        else
-          errors << "#{security.ticker}: HTTP #{response.status} - #{response.body}"
-        end
-      rescue => e
-        errors << "#{security.ticker}: #{e.message}"
-      end
-
-      # Add a small delay to not overwhelm the API
-      sleep(0.1)
-    end
-
-    puts "\n\nBackfill complete!"
-    puts "Processed #{processed} securities"
-
-    if errors.any?
-      puts "\nErrors encountered:"
-      errors.each { |error| puts "  - #{error}" }
-    end
-  end
-
   desc "De-duplicate securities based on ticker + exchange_operating_mic"
   task :deduplicate, [ :dry_run ] => :environment do |_t, args|
     dry_run = args[:dry_run].present?
diff --git a/test/controllers/settings/hostings_controller_test.rb b/test/controllers/settings/hostings_controller_test.rb
index ef672d3d7..cb18866f8 100644
--- a/test/controllers/settings/hostings_controller_test.rb
+++ b/test/controllers/settings/hostings_controller_test.rb
@@ -8,7 +8,6 @@ class Settings::HostingsControllerTest < ActionDispatch::IntegrationTest
     sign_in users(:family_admin)
 
     @provider = mock
-    Provider::Registry.stubs(:get_provider).with(:synth).returns(@provider)
     Provider::Registry.stubs(:get_provider).with(:twelve_data).returns(@provider)
     @usage_response = provider_success_response(
       OpenStruct.new(
@@ -32,7 +31,6 @@ class Settings::HostingsControllerTest < ActionDispatch::IntegrationTest
 
   test "should get edit when self hosting is enabled" do
     @provider.expects(:usage).returns(@usage_response)
-    @provider.expects(:usage).returns(@usage_response)
 
     with_self_hosting do
       get settings_hosting_url
@@ -42,9 +40,9 @@ class Settings::HostingsControllerTest < ActionDispatch::IntegrationTest
 
   test "can update settings when self hosting is enabled" do
     with_self_hosting do
-      patch settings_hosting_url, params: { setting: { synth_api_key: "1234567890" } }
+      patch settings_hosting_url, params: { setting: { twelve_data_api_key: "1234567890" } }
 
-      assert_equal "1234567890", Setting.synth_api_key
+      assert_equal "1234567890", Setting.twelve_data_api_key
     end
   end
 
diff --git a/test/interfaces/security_provider_interface_test.rb b/test/interfaces/security_provider_interface_test.rb
index a994bb73b..2d133683d 100644
--- a/test/interfaces/security_provider_interface_test.rb
+++ b/test/interfaces/security_provider_interface_test.rb
@@ -27,7 +27,7 @@ module SecurityProviderInterfaceTest
 
       assert response.success?
       assert response.data.first.date.is_a?(Date)
-      assert_equal 147, response.data.count # Synth won't return prices on weekends / holidays, so less than total day count of 213
+      assert_equal 147, response.data.count
     end
   end
 
diff --git a/test/models/family/auto_merchant_detector_test.rb b/test/models/family/auto_merchant_detector_test.rb
index 69c8e3cd5..21f9f4e15 100644
--- a/test/models/family/auto_merchant_detector_test.rb
+++ b/test/models/family/auto_merchant_detector_test.rb
@@ -29,8 +29,8 @@ class Family::AutoMerchantDetectorTest < ActiveSupport::TestCase
 
     assert_equal "McDonalds", txn1.reload.merchant.name
     assert_equal "Chipotle", txn2.reload.merchant.name
-    assert_equal "https://logo.synthfinance.com/mcdonalds.com", txn1.reload.merchant.logo_url
-    assert_equal "https://logo.synthfinance.com/chipotle.com", txn2.reload.merchant.logo_url
+    assert_nil txn1.reload.merchant.logo_url
+    assert_nil txn2.reload.merchant.logo_url
     assert_nil txn3.reload.merchant
 
     # After auto-detection, all transactions are locked and no longer enrichable
diff --git a/test/models/provider/registry_test.rb b/test/models/provider/registry_test.rb
deleted file mode 100644
index 76c20cd70..000000000
--- a/test/models/provider/registry_test.rb
+++ /dev/null
@@ -1,27 +0,0 @@
-require "test_helper"
-
-class Provider::RegistryTest < ActiveSupport::TestCase
-  test "synth configured with ENV" do
-    Setting.stubs(:synth_api_key).returns(nil)
-
-    with_env_overrides SYNTH_API_KEY: "123" do
-      assert_instance_of Provider::Synth, Provider::Registry.get_provider(:synth)
-    end
-  end
-
-  test "synth configured with Setting" do
-    Setting.stubs(:synth_api_key).returns("123")
-
-    with_env_overrides SYNTH_API_KEY: nil do
-      assert_instance_of Provider::Synth, Provider::Registry.get_provider(:synth)
-    end
-  end
-
-  test "synth not configured" do
-    Setting.stubs(:synth_api_key).returns(nil)
-
-    with_env_overrides SYNTH_API_KEY: nil do
-      assert_nil Provider::Registry.get_provider(:synth)
-    end
-  end
-end
diff --git a/test/models/provider/synth_test.rb b/test/models/provider/synth_test.rb
deleted file mode 100644
index 5dfa3bed5..000000000
--- a/test/models/provider/synth_test.rb
+++ /dev/null
@@ -1,26 +0,0 @@
-require "test_helper"
-require "ostruct"
-
-class Provider::SynthTest < ActiveSupport::TestCase
-  include ExchangeRateProviderInterfaceTest, SecurityProviderInterfaceTest
-
-  setup do
-    @subject = @synth = Provider::Synth.new(ENV["SYNTH_API_KEY"])
-  end
-
-  test "health check" do
-    VCR.use_cassette("synth/health") do
-      assert @synth.healthy?
-    end
-  end
-
-  test "usage info" do
-    VCR.use_cassette("synth/usage") do
-      usage = @synth.usage.data
-      assert usage.used.present?
-      assert usage.limit.present?
-      assert usage.utilization.present?
-      assert usage.plan.present?
-    end
-  end
-end
diff --git a/test/system/settings_test.rb b/test/system/settings_test.rb
index 028aad18d..7da571784 100644
--- a/test/system/settings_test.rb
+++ b/test/system/settings_test.rb
@@ -33,7 +33,6 @@ class SettingsTest < ApplicationSystemTestCase
 
   test "can update self hosting settings" do
     Rails.application.config.app_mode.stubs(:self_hosted?).returns(true)
-    Provider::Registry.stubs(:get_provider).with(:synth).returns(nil)
     Provider::Registry.stubs(:get_provider).with(:twelve_data).returns(nil)
     open_settings_from_sidebar
     assert_selector "li", text: "Self hosting"
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 077eae5bc..a5edb0cde 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -28,7 +28,6 @@ VCR.configure do |config|
   config.hook_into :webmock
   config.ignore_localhost = true
   config.default_cassette_options = { erb: true }
-  config.filter_sensitive_data("<SYNTH_API_KEY>") { ENV["SYNTH_API_KEY"] }
   config.filter_sensitive_data("<OPENAI_ACCESS_TOKEN>") { ENV["OPENAI_ACCESS_TOKEN"] }
   config.filter_sensitive_data("<OPENAI_ORGANIZATION_ID>") { ENV["OPENAI_ORGANIZATION_ID"] }
   config.filter_sensitive_data("<STRIPE_SECRET_KEY>") { ENV["STRIPE_SECRET_KEY"] }
diff --git a/test/vcr_cassettes/synth/exchange_rate.yml b/test/vcr_cassettes/synth/exchange_rate.yml
deleted file mode 100644
index adc22263d..000000000
--- a/test/vcr_cassettes/synth/exchange_rate.yml
+++ /dev/null
@@ -1,81 +0,0 @@
----
-http_interactions:
-- request:
-    method: get
-    uri: https://api.synthfinance.com/rates/historical?date=2024-01-01&from=USD&to=GBP
-    body:
-      encoding: US-ASCII
-      string: ''
-    headers:
-      Authorization:
-      - Bearer <SYNTH_API_KEY>
-      X-Source:
-      - maybe_app
-      X-Source-Type:
-      - managed
-      User-Agent:
-      - Faraday v2.13.1
-      Accept-Encoding:
-      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
-      Accept:
-      - "*/*"
-  response:
-    status:
-      code: 200
-      message: OK
-    headers:
-      Date:
-      - Fri, 16 May 2025 13:01:38 GMT
-      Content-Type:
-      - application/json; charset=utf-8
-      Transfer-Encoding:
-      - chunked
-      Connection:
-      - keep-alive
-      Cache-Control:
-      - max-age=0, private, must-revalidate
-      Etag:
-      - W/"0c93a67d0c68e6f206e2954a41aa2933"
-      Referrer-Policy:
-      - strict-origin-when-cross-origin
-      Rndr-Id:
-      - 146e30b2-e03b-47e3
-      Strict-Transport-Security:
-      - max-age=63072000; includeSubDomains
-      Vary:
-      - Accept-Encoding
-      X-Content-Type-Options:
-      - nosniff
-      X-Frame-Options:
-      - SAMEORIGIN
-      X-Permitted-Cross-Domain-Policies:
-      - none
-      X-Render-Origin-Server:
-      - Render
-      X-Request-Id:
-      - 3cf7ade1-8066-422a-97c7-5f8b99e24296
-      X-Runtime:
-      - '0.024284'
-      X-Xss-Protection:
-      - '0'
-      Cf-Cache-Status:
-      - DYNAMIC
-      Report-To:
-      - '{"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=ih8sEFqAOWyINqAEtKGKPKO2lr1qAYSVeipyB5F8g2umPODXvCD4hN3G6wTTs2Q7H8CDWsqiOlYkmVvmr%2BWvl2ojOtBwO25Ahk9TbhlcgRO9nT6mEIXOSdVXJpzpRn5Ov%2FMGigpQ"}],"group":"cf-nel","max_age":604800}'
-      Nel:
-      - '{"success_fraction":0,"report_to":"cf-nel","max_age":604800}'
-      Speculation-Rules:
-      - '"/cdn-cgi/speculation"'
-      Server:
-      - cloudflare
-      Cf-Ray:
-      - 940b109b5df1a3d7-ORD
-      Alt-Svc:
-      - h3=":443"; ma=86400
-      Server-Timing:
-      - cfL4;desc="?proto=TCP&rtt=25865&min_rtt=25683&rtt_var=9996&sent=4&recv=6&lost=0&retrans=0&sent_bytes=2827&recv_bytes=922&delivery_rate=106690&cwnd=219&unsent_bytes=0&cid=e48ae188d1f86721&ts=190&x=0"
-    body:
-      encoding: ASCII-8BIT
-      string: '{"data":{"date":"2024-01-01","source":"USD","rates":{"GBP":0.785476}},"meta":{"total_records":1,"credits_used":1,"credits_remaining":249734,"date":"2024-01-01"}}'
-  recorded_at: Fri, 16 May 2025 13:01:38 GMT
-recorded_with: VCR 6.3.1
diff --git a/test/vcr_cassettes/synth/exchange_rates.yml b/test/vcr_cassettes/synth/exchange_rates.yml
deleted file mode 100644
index 87071b8ff..000000000
--- a/test/vcr_cassettes/synth/exchange_rates.yml
+++ /dev/null
@@ -1,81 +0,0 @@
----
-http_interactions:
-- request:
-    method: get
-    uri: https://api.synthfinance.com/rates/historical-range?date_end=2024-07-31&date_start=2024-01-01&from=USD&page=1&to=GBP
-    body:
-      encoding: US-ASCII
-      string: ''
-    headers:
-      Authorization:
-      - Bearer <SYNTH_API_KEY>
-      X-Source:
-      - maybe_app
-      X-Source-Type:
-      - managed
-      User-Agent:
-      - Faraday v2.13.1
-      Accept-Encoding:
-      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
-      Accept:
-      - "*/*"
-  response:
-    status:
-      code: 200
-      message: OK
-    headers:
-      Date:
-      - Fri, 16 May 2025 13:01:35 GMT
-      Content-Type:
-      - application/json; charset=utf-8
-      Transfer-Encoding:
-      - chunked
-      Connection:
-      - keep-alive
-      Cache-Control:
-      - max-age=0, private, must-revalidate
-      Etag:
-      - W/"ad21b1fba71fe0b149fe37b483a60438"
-      Referrer-Policy:
-      - strict-origin-when-cross-origin
-      Rndr-Id:
-      - 28bc6622-47b8-4aeb
-      Strict-Transport-Security:
-      - max-age=63072000; includeSubDomains
-      Vary:
-      - Accept-Encoding
-      X-Content-Type-Options:
-      - nosniff
-      X-Frame-Options:
-      - SAMEORIGIN
-      X-Permitted-Cross-Domain-Policies:
-      - none
-      X-Render-Origin-Server:
-      - Render
-      X-Request-Id:
-      - fcf251a3-f850-4464-9592-ced9de5e0c86
-      X-Runtime:
-      - '0.080857'
-      X-Xss-Protection:
-      - '0'
-      Cf-Cache-Status:
-      - DYNAMIC
-      Report-To:
-      - '{"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=622lysAXubNaj3TsuhR9RYZRXPc%2BgnyMWj52fxy%2BptvXoPr%2FxVJgJZ0g02mOUjCywdAymkMpawfWCaZVQOIaPVpocco3g4Y%2B0FB667ilf3UtCyiHwqCosUq0T99JabIsgFFJ%2FhP4"}],"group":"cf-nel","max_age":604800}'
-      Nel:
-      - '{"success_fraction":0,"report_to":"cf-nel","max_age":604800}'
-      Speculation-Rules:
-      - '"/cdn-cgi/speculation"'
-      Server:
-      - cloudflare
-      Cf-Ray:
-      - 940b108a2921607d-ORD
-      Alt-Svc:
-      - h3=":443"; ma=86400
-      Server-Timing:
-      - cfL4;desc="?proto=TCP&rtt=25729&min_rtt=25575&rtt_var=9899&sent=4&recv=6&lost=0&retrans=0&sent_bytes=2825&recv_bytes=961&delivery_rate=108019&cwnd=251&unsent_bytes=0&cid=ca574e4a637aba29&ts=241&x=0"
-    body:
-      encoding: ASCII-8BIT
-      string: 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deleted file mode 100644
index c06c0f420..000000000
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index d60922db7..000000000
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