MCPFax Agent Reliability Scores

Endpoints (62 live)

• GET /payto-change-feed (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /score — MCPFax credit grade, subscores, confidence, and cited evidence (0.008 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /revenue — Observed USDC inflow, payer breadth, trend, and cohort rank (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /payto-change-feed (0.005 USDC on Base)
• GET /payer — Know-your-agent payer graph and coverage-gated screening signals (0.008 USDC on Base)

+42 more endpoints.

MCP tools (7)

MCPFax Reliability https://mcpfax-reliability.bowling-anthony.workers.dev/mcp

• mcpfax_endpoint_credit_score — Creditworthiness grade for one x402 endpoint or MCP server: letter grade A-E (or NR when unrated), a 0-1000 score, per-component subscores, a confidence level, flags, and the dated evidence each figure rests on. Use this before trusting or paying an unfamiliar endpoint. The grade ranks observed risk; it is not a calibrated probability of failure, not validated over any forward horizon, and not a security audit. Coverage is young: the response carries archive_coverage (measured archive span), most listings grade NR, and payer-concentration risk is reported as "not rated" until a listing's own payment record clears the published coverage floor. Costs $0.008 USDC per call via x402 on Base.
• mcpfax_endpoint_revenue_estimate — Observed on-chain revenue signals for one listing: total USDC inflow, how many distinct payers, the modal transfer size, payment rate, 7- and 30-day trend windows, and where it sits in its cohort by percentile. Use this to size a seller's real traction. Inflow is observed on-chain and is not proven to be x402 sales revenue. Trend windows are only as wide as the wallet's real scanned span, which the response reports as trends.scanned_days with per-window backed-by-scan flags; a 30-day window is not yet backed by 30 days of scanning. Costs $0.005 USDC per call via x402 on Base.
• mcpfax_integration_drift — What changed under an x402 endpoint or MCP server you have ALREADY integrated: payTo rotations, price, asset and network changes, terms added or removed, and tool-schema changes. This is not a discovery tool and will not help you choose a server; it tells you whether the one you wired in still matches what you wired in. Pass up to 50 subjects and the `since` watermark returned by your last call, and you receive only what changed after it plus a fresh watermark, so repeat checks stay cheap. A subject with no changes is reported as observed-unchanged with the date that is true as of — that is a real answer and is billed. A subject MCPFax has never observed is named in `not_observed` and given NO verdict, because reporting "no changes" about something we never watched is indistinguishable from a genuine all-clear. The watermark is the last date MCPFax actually observed, never the current clock, so no window is skipped between sweeps. Coverage is young and every response carries its archiv
• mcpfax_payer_wallet_profile — Know-your-agent profile for a paying wallet: how many distinct services it pays, total observed spend, whether the address is a contract or an externally owned account, and coverage-gated screening signals. Use this to vet a counterparty that is paying you. Screening signals are withheld with status "not_rated" until the observed record for the address clears the published coverage floor (14 days, 20 payments); the measured graph facts are always returned and carry no inference about intent. Costs $0.008 USDC per call via x402 on Base.
• mcpfax_payto_change_feed — Chronological feed of rating actions since a date: grade upgrades and downgrades, payTo wallet changes (a seller redirecting payment), listing removals, and returns. Use this to monitor a portfolio of endpoints for adverse changes rather than re-scoring each one. The feed cannot return events from before the observatory archive started; the response reports coverage.archive_since, coverage.rating_actions_recorded, and whether the requested window predates the archive. Costs $0.005 USDC per call via x402 on Base.
• mcpfax_preflight_check — Check that an endpoint is live and that its terms have not changed, BEFORE you send it an expensive request. A $15 call with a hypothetical 2% loss rate carries $0.30 of expected loss; a reachability check cannot promise to prevent it. Compare the quoted fee with the value of the pending call and the failures this check can actually detect. For a cheap $0.001 lookup, the $0.008 fee is eight times the call price. Returns two halves. LIVE: one unpaid bounded probe (~2.2s cap) giving reachability, HTTP status, latency, whether an MCP server still answers initialize, and the price and payTo it is serving right now. HISTORICAL: reliability over our OBSERVED window (stated in days, never implied), payTo changes, price changes, tool-schema changes, first-seen date, and credit grade or an honest not-rated. Supply expected_price, expected_payto or expected_schema_hash and each is compared with old to new and the date we first observed the change. The verdict is ALLOW, WARN or UNKNOWN and is ADV
• mcpfax_wallet_authenticity — Payer-concentration and wash-risk assessment for a receiving wallet: how concentrated its observed payers are, the measured coverage of that observation, an explicit wash-risk haircut ONLY when coverage is sufficient, how many listings declare the same address, and observed USDC inflow. Use this to judge whether a seller's apparent revenue reflects real independent demand. The haircut and the adjusted-inflow figure are withheld as null with status "not_rated" until the wallet's own record covers at least 14 days and 20 payments, because below that a thin payer count is a property of our observation window, not of the wallet. Concentration is not proof of common control. Costs $0.01 USDC per call via x402 on Base.