x402 Doctor

Connect Remote server

claude mcp add --transport http x402-doctor https://x402-doctor.fizzl.eu/mcp

{
  "mcpServers": {
    "x402-doctor": {
      "url": "https://x402-doctor.fizzl.eu/mcp"
    }
  }
}

{
  "servers": {
    "x402-doctor": {
      "type": "http",
      "url": "https://x402-doctor.fizzl.eu/mcp"
    }
  }
}

Settings > Connectors > Add custom connector
URL: https://x402-doctor.fizzl.eu/mcp

Tools 15 found in our last check

• x402_quick_check

  Free: does this x402 endpoint work for a paying agent? Returns pass, warn or fail with the number of problems and the top three. Limited to 10 calls per hour. For every check use x402_diagnose ($0.01); for code changes x402_fix ($0.05); before paying someone else's endpoint x402…

• x402_payee_check

  Free: is every payTo of this x402 endpoint really its seller's? Per payment option, one outcome of the draft ERC "x402 Payee Verification for ERC-8004 Agents": verified-wallet (the payTo is the agent wallet registered in the ERC-8004 Identity Registry), verified-delegation (the…

• check_payment_proof

  Free: after paying an x402 endpoint, pass the PAYMENT-RESPONSE header it returned (X-PAYMENT-RESPONSE in v1). Returns the transaction, network and payer it names, whether that transaction exists on-chain and succeeded, and which USDC moved from whom to whom, with an explorer lin…

• concordium_badge_check

  Free: look up an agent in Concordium's Agent Registry (CIS-8004) by its badge, the CIS-2 token address an Agent Card carries, or by the longer Agent ID that Concordium's registry app shows. Returns whether the badge is valid (Active, the card at agent_uri hashes to the metadata_…

• x402_trust_record

  Free: the daily track record of a paid x402 or MPP endpoint from the x402 Trust Index: on how many of the last 30 scanned days an agent could pay it, the latest verdict and reasons, price and networks. found: false when it is not in the index; add your own endpoint with x402_tru…

• x402_trust_add

  Free: add your own paid endpoint to the x402 Trust Index when no registry lists it yet (CDP Bazaar, Circle's Agent Marketplace, GoPlausible, XRPL AI Hub, nohumans.directory, PayAPI Market, HIVE402, MPP directory). x402 Doctor first checks that it answers 402 with a payment chall…

• verify_receipt

  Free: check the signed receipt that every paid x402 Doctor answer carries (diagnose, preflight, batch, deep, fix, delivery check; HTTP or MCP), for example to prove later which verdict you got before paying an endpoint. Pass the whole answer as response. Returns valid, the signe…

• x402_diagnose

  Paid ($0.01 via x402 in USDC on Base, Solana, Monad, Polygon, Arbitrum, Avalanche, Algorand or Stellar, or in RLUSD on the XRP Ledger): diagnose an x402 endpoint the way a paying agent would, without paying it: the 402 challenge format, every accepts[] option, the resource URL,…

• x402_preflight

  Paid ($0.001 via x402 in USDC on Base, Solana, Monad, Polygon, Arbitrum, Avalanche, Algorand or Stellar, or in RLUSD on the XRP Ledger): call this before your agent pays an x402 endpoint. Returns go, caution or no_go, the recommended payment option, and why: payment would fail,…

• x402_fix

  Paid ($0.05 via x402 in USDC on Base, Solana, Monad, Polygon, Arbitrum, Avalanche, Algorand or Stellar, or in RLUSD on the XRP Ledger): diagnoses your x402 endpoint, then returns per problem the concrete change as code for your stack (express, next, hono, node, python, generic),…

• x402_preflight_batch

  Paid ($0.005 via x402 in USDC on Base, Solana, Monad, Polygon, Arbitrum, Avalanche, Algorand or Stellar, or in RLUSD on the XRP Ledger): the pre-payment check for up to 10 x402 endpoints at once. Per endpoint go, caution or no_go, the recommended payment option and why, plus tot…

• x402_preflight_deep

  Paid ($0.01 via x402 in USDC on Base, Solana, Monad, Polygon, Arbitrum, Avalanche, Algorand or Stellar, or in RLUSD on the XRP Ledger): for expensive calls. The pre-payment verdict (go, caution or no_go) plus the full diagnosis, the 30-day history per day, how reliable the selle…

• x402_delivery_check

  Paid ($0.25 via x402 in USDC on Base, Solana, Monad, Polygon, Arbitrum, Avalanche, Algorand or Stellar, or in RLUSD on the XRP Ledger): not a reading but a purchase. x402 Doctor buys the endpoint once (at most $0.1, USDC on Base, from its own wallet) with the example input its l…

• x402_delivery_status

  Free: the status of a delivery check ordered with x402_delivery_check (or GET /api/v1/delivery-check): awaiting_payment, queued or done, and once done the result: paid_and_delivered, the outcome, the charge measured on chain and the transaction.

• feedback

  Report a bug, a missing feature or anything else about this service, in a structured way. Free. A person reads every report; nothing is run or changed automatically.

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