Changelog

This changelog records shipped documentation and developer-facing changes. It starts with the 2026-11-11 release and does not reconstruct older history.

2026-11-11

Developer guide

Added the developer guide under Guides, including migration paths for Fixer, CurrencyLayer, and ExchangeRate-API, a provider-neutral migration checklist, a generated Postman collection, this changelog, a FAQ, and a support page. The guide also covers caching, retries, testing, observability, framework setup, and common product patterns.

OpenAPI 3.1 published

Published the OpenAPI 3.1 contract at /openapi.json. It covers all 15 public paths, both authentication schemes (Authorization: Bearer and x-api-key), the shared error envelope, and the response schemas used by the API reference. The file is copied from packages/shared/openapi.json so the API, SDKs, and site use one source. See OpenAPI specification.

MCP OAuth fix

Fixed MCP OAuth discovery for remote clients:

• An unauthenticated request to /mcp now returns 401 with a WWW-Authenticate challenge instead of 200 with a reduced public tool list. Remote clients start the sign-in flow from that challenge.
• Protected-resource metadata is served at both /.well-known/oauth-protected-resource and /.well-known/oauth-protected-resource/mcp.
• The metadata resource is the exact /mcp URL, not the bare host, and the advertised scope includes mcp:tools.

See MCP OAuth and access and MCP troubleshooting.

Docs hub

Rebuilt the documentation hub at /docs/ with navigation grouped by Info, Endpoints, AI, MCP, Code Examples, and Integrations. The hub links the quickstart, authentication, OpenAPI, errors, MCP, and AI entry points, plus task-oriented guides.

API reference

Published the browsable REST reference at /docs/api/. It is generated from the same OpenAPI contract and grouped into Core, History, PPP, Analytics, Reference, and AI. Each path lists its parameters, authentication requirements, plan gates, response statuses, and schema names.

Verified at this release

These facts are current for this release and are documented on the linked pages:

• 15 public REST paths, described in the OpenAPI specification and the API reference.
• 160 fiat currencies. /v1/currencies returns 165 entries: 160 fiat plus XAU, XAG, XPT, XPD, and XDR reference entries. See Currencies.
• History reaches 1949 as annual parity for GBP/USD and USD/INR, 1971 for daily majors, and 1999 for EUR pairs. See History and History coverage.
• Free includes 1,000 requests per month, 100 AI credits, and the last 30 days of history. Starter is $9/mo with 50,000 requests and full history. Public pricing checked 2026-11-10. See Rate limits and Pricing.
• The rate feed is fiat only. Reference rates are polled hourly from central-bank sources, with daily fixings underneath. There is no 60-second feed. See Rates.

Related

• OpenAPI specification
• Authentication
• Errors
• Rate limits
• All integration guides
• API reference