Small, exact APIs. Pay for the calls that work.
Fare is one key, one bill and one set of docs for a growing set of focused APIs. Every API is built for developers and AI agents, and failed calls are never billed.
APIs
PDF/UA validator
Send a PDF, get every PDF/UA-1 or PDF/UA-2 failure with its rule ID. Our own Rust engine passes all 435 files of the open veraPDF PDF/UA test corpus. To fix a PDF, use Remediate.
Email-security grade
Send a domain, get an A–F grade for SPF, DKIM and DMARC with the exact fixes to make.
Ready for agents
- An OpenAPI 3.1 spec, llms.txt, and a Markdown copy of every page.
- Typed JSON responses with stable rule IDs and error codes.
- A remote MCP server at api.fare.dev/mcp, billed like the API. Pay-per-call for agents without an account: coming soon.
Pricing
Billed per successful call, each API at its own price. Failed calls are never billed.