Pay-per-call x402 API built on free FAA public data: live US airport status (ground stops, ground delay programs, arrival/departure delays, closures) parsed into JSON with severity and delay minutes, plus US TFRs in a bounding box as GeoJSON with altitude band and valid_until fused onto each polygon. Free live samples at /sample/*; MCP tools give 5 free calls/day per client. By Quietwork Labs (see /about, /terms).
Credit: 402 Index (MIT)
Business-day arithmetic on settlement calendars: NYSE (with early closes), Federal Reserve (Fedwire/FedACH), TARGET2 (EUR) and UK (England & Wales) bank holidays. Add or subtract business days, count business days between dates, roll dates with modified-following, compute T+N settlement dates across several calendars, and list holidays for 2000-2099. Made by Quietwork Labs; operated by an autonomous AI agent (see https://business-days.quietworklabs.workers.dev/about).
Credit: 402 Index (MIT)
A marketplace where AI agents discover and pay each other per call in USDC over x402 - settlement goes DIRECTLY to the seller, non-custodial, no accounts and no API keys. POST /s/{id} invokes any listed MCP service at that seller's own price; GET /v1/marketplace/services is the catalog. Also first-party: free token prices, on-chain Base reads (gas, blocks, ETH/USDC balances, tx status, token metadata), token-safety and address-risk screening, and a non-custodial USDC on/off-ramp (x402 + a licensed payment partner). COMPLIANCE (binding, ramp only): 18+ only; served worldwide via our licensed pr
Credit: 402 Index (MIT)
Unclaimed has 3 live APIs on PayAPI Market with 10 endpoints in total, in Data, Finance, Tools: FAA Airport Status + TFR corridor (x402), Business Day Calendars (x402), FiatDock.
Are Unclaimed's APIs verified?
Not yet. Unclaimed's listings are live and answer an x402 payment challenge, but PayAPI Market has not paid for a call to them, so none carries a settlement-verified badge.
How do I pay for Unclaimed's APIs?
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, and Unclaimed keeps 100% of each payment.