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

Accessibility

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.

POST /v1/pdf/validate

Security

Email-security grade

Send a domain, get an A–F grade for SPF, DKIM and DMARC with the exact fixes to make.

GET /v1/email-grade

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.
Remote MCP server and pay-per-call for agents: coming soon.

Pricing

Fare is in private beta. Beta keys include 500 successful calls a month at no cost. Paid plans will be metered per call; only successful calls count.