MCP server

x402 Doctor

io.github.Fizzl13/x402-doctor

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Is this x402/MPP API safe to pay? $0.001 preflight, fixes, a $0.25 test purchase. Free quick check.

Website Source

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

13

Token cost

About 4,134 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.x402-doctor]
url = "https://x402-doctor.fizzl.eu/mcp"

Gemini CLI

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

Cursor

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

VS Code

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

Antigravity

agy mcp add x402-doctor https://x402-doctor.fizzl.eu/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"x402-doctor","server_url":"https://x402-doctor.fizzl.eu/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"x402-doctor","server_url":"https://x402-doctor.fizzl.eu/mcp"}

Tools

• check_payment_proof ~184 tokens
  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 link. Read-only. Limited
• verify_receipt ~327 tokens
  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 signer and whether it is a
• x402_delivery_check ~353 tokens
  Paid ($0.25 via x402 in USDC on Base, Solana, 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 listing declares, checks the answer against the declared ou
• x402_delivery_status ~158 tokens
  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.
• x402_diagnose ~383 tokens
  Paid ($0.01 via x402 in USDC on Base, Solana, 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, Solana settlement readiness, which wallets can pay, Bazaar
• x402_fix ~384 tokens
  Paid ($0.05 via x402 in USDC on Base, Solana, 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), filled in with your own payTo, amount, network and route.
• x402_preflight ~547 tokens
  Paid ($0.001 via x402 in USDC on Base, Solana, 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, the seller's payout address is on the OFAC SDN sanctions l
• x402_preflight_batch ~406 tokens
  Paid ($0.005 via x402 in USDC on Base, Solana, 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 totals. For marketplaces and agents that weigh several servic
• x402_preflight_deep ~490 tokens
  Paid ($0.01 via x402 in USDC on Base, Solana, 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 seller's other endpoints are and whether the endpoint moved dom
• x402_quick_check ~279 tokens
  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_preflight ($0.001).
• x402_trust_add ~212 tokens
  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, MPP directory). x402 Doctor first checks that it answers 402 with a payment challenge (x402, MPP or L402); the
• x402_trust_record ~203 tokens
  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_trust_add. Limited to 10

Browse

• GitHub tools
• OpenAPI tools
• Payments
• GitHub and code hosting
• APIs and testing
• Crypto and blockchains

Related MCP servers

• Launch Lab XRP Data
  XRP research, paper arena and free XRPL transaction explanations / x402 diagnostics. No signing.
• Maxwell Directory (x402 + MCP)
  Local providers worldwide, plus travel and public data. Free search; paid answers via x402.
• x402 Preflight
  Inspect and validate an x402 endpoint before an autonomous agent spends USDC.
• SALT19 Agent Utility Grid
  MCP/x402 tools with bounded decisions, adaptive pricing, and Proof402 machine-commerce receipts.
• HumanMirror x402 Microtools + OmniDome Commons
  HumanMirror x402 MCP: paid Safe Preflight, execution evidence and machine microtools on Base/USDC.
• x402fix
  x402 endpoint doctor: grades a paid route A-F unpaid, with paste-ready fixes. By Crypto Money Maker
• Batchloom Evidence
  Free report citation preflight and real-source trials; paid evidence via a local wallet adapter.
• Xsignal
  x402 pay-per-call data tools for Base agents. Flagship get_intent ABSTAINS instead of guessing.

Badge for your README

[![AptLynx](https://aptlynx.net/badge/io.github.Fizzl13/x402-doctor.svg)](https://aptlynx.net/servers/io.github.Fizzl13/x402-doctor)

Listing text is written by the maker; AptLynx lists tools and does not vouch for them. Find another tool · Browse by topic · For agents