3 APIs · Base network · x402 protocol
LinkProof: verify up to 10 URLs before an agent cites or sends them. Per URL returns verdict (live, soft_404, parked, dead, blocked, unreachable), HTTP status, final URL after redirects, title, meta description, and optional check that an expected phrase appears on the page. Catches hallucinated or rotted links.
$0.005–$0.005LinkProof archive: for up to 10 URLs (e.g. dead links), find the closest Internet Archive Wayback Machine snapshot, optionally nearest to a given date. Returns snapshot URL, capture timestamp, captured HTTP status and distance in days from the requested date. Use it to replace or back up rotted citations.
$0.005–$0.005LinkProof citations: verify up to 10 references an agent is about to cite. Accepts DOI, arXiv id, PubMed id, free-text reference, or {title, authors, year}. Checks Crossref/DataCite, arXiv and PubMed; returns per citation exists, matched metadata (title, authors, year, venue, URL), field mismatches, confidence and verdict (verified, mismatch, not_found). Catches hallucinated or misattributed papers.
$0.01–$0.01linkproof.bsptimber.workers.devLinkProof citations: verify up to 10 references an agent is about to cite has 3 live APIs on PayAPI Market with 0 endpoints in total, in Verification: LinkProof: verify up to 10 URLs before an agent cites or sends them, LinkProof archive: for up to 10 URLs (e, LinkProof citations: verify up to 10 references an agent is about to cite.
3 of 3 have at least one settlement-verified route: PayAPI Market paid for a real call from its own wallet, received real data back and recorded the USDC payment on-chain. Each listing page shows which routes were paid and links the receipt.
Per request, in USDC, over the x402 protocol. An agent calls the endpoint, receives HTTP 402 with the price and wallet, pays and retries. There is no API key, account or subscription. Free to list. PayAPI takes 0% of each job, and LinkProof citations: verify up to 10 references an agent is about to cite is paid directly.