Add CurrencyCore to ChatGPT.
One custom MCP server.
ChatGPT can call CurrencyCore's currency tools from a workspace chat. Add the server URL, connect it with OAuth, and choose an organization. ChatGPT then fetches central-bank reference rates, PPP data, and history instead of answering from training memory.
No JSON config · OAuth on first connect · Same quota as the REST API
// Workspace settings
Plugins / Connectors
Add custom MCP server
Name: CurrencyCore
URL: https://mcp.currency-core.com/mcp
// Connect, sign in, choose an organizationCheck the workspace, not just the URL.
Custom MCP servers are a workspace feature. If the option is missing, the cause is usually the plan or an admin policy.
| Requirement | Detail |
|---|---|
| Plan | Full MCP tool calls require a Business, Enterprise, or Edu workspace on the web. |
| Pro | Pro accounts have limited read and fetch connector support, not full tool calling. |
| Admin permission | A workspace admin may need to allow custom connectors or MCP servers first. |
| Client | Use the web app. This page does not claim mobile support. |
Four steps, no config file.
There is no mcpServers JSON for this path. The server is added through the workspace UI.
Confirm the workspace
Make sure you are in a Business, Enterprise, or Edu workspace, and that a workspace admin allows custom connectors.
Add the custom server
Open the plugins or connectors area in workspace settings and choose the custom MCP server option. Labels vary by plan and rollout.
Enter the name and URL
Use CurrencyCore and https://mcp.currency-core.com/mcp. Save the connector.
Connect and verify
Sign in through OAuth, choose an organization, then start a new chat and ask for a conversion.
Verify prompt
Ask: "Use the CurrencyCore convert tool to convert 500 USD to INR and include the rate date." A working connection returns a conversion with a date. If ChatGPT answers from memory, check that the connector is enabled for the workspace and the chat.
What ChatGPT can call.
All 14 tools are exposed. Core tools work on every plan; the seven analytics tools need Growth or higher and are gated at call time.
| Tool | What ChatGPT can do with it | Plan |
|---|---|---|
convert | Convert an amount between currencies, with optional PPP adjustment. | All plans |
get_rates | Get a USD-base reference-rate snapshot for a date. | All plans |
get_rates_by_base | Re-express the snapshot against another base currency. | All plans |
get_history | Get a dated series for one currency. Free is limited to 30 days. | All plans |
get_ppp_factor | Get one country's IMF PPP factor for a year. | All plans |
analyze_history | Summarize change, strength, and period statistics over a window. | Growth+ |
analyze_ppp | Compare PPP factor change across countries. | Growth+ |
analyze_volatility | Compare or rank currencies by annualized volatility. | Growth+ |
analyze_correlation | Measure how closely currencies move together. | Growth+ |
analyze_drawdown | Measure peak-to-trough decline and recovery. | Growth+ |
analyze_safe_haven | Score currencies on stability and crisis performance. | Growth+ |
analyze_mean_reversion | Measure how strongly a currency returns to its mean. | Growth+ |
list_countries | Resolve a country to its official currency code. No sign-in. | All plans |
list_currencies | List supported ISO 4217 codes and names. No sign-in. | All plans |
Full inputs, outputs, and errors are in the MCP tool reference. The same data is available over HTTP from the currency API.
If the tools do not appear.
Most ChatGPT problems are a workspace permission or a cached tool list, not the server URL.
No custom MCP option
Your plan may not include full MCP, or an admin has not allowed custom connectors. Ask an admin, or use Claude, Cursor, or VS Code.
Tools never run
The connection may not be authorized. Reconnect and complete OAuth, then start a new chat with tools enabled. If only two tools appear, see the pre-fix symptom.
The tool list is stale
ChatGPT freezes the tools it discovered at connect time. Refresh the connector or start a new chat.
The wrong org is billed
The connection is bound to the organization chosen at consent. Remove and re-add the connector to switch.
Analytics return 403
The analyze_ tools require Growth or higher. Core conversion and rate tools still work on Free.
429 during a busy day
The organization shares one monthly quota and rate limit across REST and MCP. Wait for the reset, or upgrade.
ChatGPT MCP questions
Can ChatGPT use CurrencyCore as an MCP server?
Yes, on a Business, Enterprise, or Edu workspace on the web. Add a custom MCP server with the URL https://mcp.currency-core.com/mcp, connect it with OAuth, and choose an organization. Pro accounts have limited read and fetch connector support rather than full tool calling.
Where do I add a custom MCP server in ChatGPT?
Open the workspace plugins or connectors area in workspace settings and choose the option to add a custom MCP server. The labels vary by plan and rollout. A workspace admin may need to allow custom connectors first.
Why are the CurrencyCore tools missing from ChatGPT?
ChatGPT freezes the tool list it discovered when the connector was added. Start a new chat, refresh the connector, or remove and re-add it. Also confirm the workspace plan supports full MCP and the connector is enabled for the chat.
Does ChatGPT use AI credits for CurrencyCore tool calls?
No. CurrencyCore MCP uses no AI credits. Each successful keyed tool call counts as one API request against the organization's monthly quota, and public tool calls are unmetered after sign-in.
Give ChatGPT real currency data.
Not training memory.
MCP is included on every CurrencyCore plan. Commercial use is allowed on every plan, including Free. Free tier: 1,000 requests per month, no credit card required.