Docs
Last updated: 2026-10-10
AttestPage returns signed evidence for AI agents: whether a quote or a whole set of citations appears on the cited pages, what our fetcher got back from a URL, whether links are live, whether package names exist on npm, PyPI or crates.io, and signed timestamps over hashes. Each page here is also markdown: add .md to its URL or send Accept: text/markdown.
Routes
- Verify a quote:
POST /v1/verify/quote, US$0.01 - Verify quotes on one page:
POST /v1/verify/quotes, US$0.08 per call of up to 20 quotes - Verify citations:
POST /v1/verify/citations, US$0.10 per batch - Verify a document:
POST /v1/verify/document, US$0.10 per part of up to 10 pairs, free preview - Fetch a page:
POST /v1/fetch, US$0.002 - Check links:
POST /v1/check/links, US$0.005 per batch - Check packages:
POST /v1/check/packages, US$0.005 per batch - Attest a hash:
POST /v1/attest, US$0.002 - Verify a receipt:
POST /v1/receipt/verify, free - Samples:
GET /v1/sample/{name}, free
Guides
- Payments: the x402 flow and when a call is charged
- How it works: the fetcher, content_kind values and receipts
- Receipt demo: a signed receipt end to end, with free calls only
- Demo: one paid call and its signed receipt: the request, the 402 offer, the paid retry with x402 and the receipt, with a signature check in Node.js
- Verify receipts offline: the checker script and keys
- MCP server: one MCP tool per route, paying with x402 or the free trial
- Agent Skill: a SKILL.md telling an agent when to check a source and how to read the verdict
- Example recipes: LangChain, LlamaIndex, OpenAI Agents SDK and Claude Agent SDK agents that call these routes on the trial or with x402
- More examples: runnable recipes, including one x402 payment step by step with plain
fetch - Limits: caps, timeouts and rate limits
- Errors: error codes and charging
- Status: current state and uptime (JSON)
Answers
- How to verify a quote an LLM cites
- How to check a quote an LLM cites, step by step with curl: the free sample, the 402 offer, one check, the receipt, and the same call over MCP
- How to get a signed receipt of a web page
- How to get a signed receipt of a web page, step by step with curl: the free sample, the 402 offer, one receipt, its signature and text hash, and the same call over MCP
- How to check links before citing them
- How to check links before citing them, step by step with curl: the free sample, the 402 offer, one batch of links, the receipt, and the same call over MCP
- How to check a package name an LLM suggested before installing it
- How to tell a bot wall from the real page when an agent fetches a URL