Index onlineMerchant portal
Api Endpoint

x402 Doctor

Why is my x402 endpoint broken? Diagnose and debug an x402 payment endpoint (or MCP server) when payments fail: checks the 402 challenge, accepts[] (network, payTo, amount, asset), resource URL, Solana settlement readiness, which wallets and agents can pay, Bazaar/OpenAPI discovery and the browser paywall. Returns every check with a fix hint. Read-only: never pays. Bulk: 1000 credits for $0.80 via /api/v1/credits.

Open interactive test console

Offering

Provider
x402-doctor.fizzl.eu
Method
GET
Offering type
Api Endpoint
Transport type
http
Category
Blockchain And Crypto
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://x402-doctor.fizzl.eu/api/v1/diagnose
MIME type
application/json
First seen
2026-10-16T01:50:38.788Z
Last seen
Tags
X402, developer-tools, diagnostics, debug, Payments

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
0.01 USDC
Atomic price: 10000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2
0.01 USDC
Atomic price: 10000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact
Payment option 3
10000 atomic units
Atomic price: 10000 · Network: algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73k · Asset: 31566704 · Scheme: exact
Payment option 4
100000 atomic units
Atomic price: 100000 · Network: stellar:pubnet · Asset: CCW67TSZV3SSS2HXMBQ5JFGCKJNXKZM7UQUWUZPUTHXSTZLEO7SJMI75 · Scheme: exact
Payment option 5
10000 atomic units
Atomic price: 10000 · Network: eip155:196 · Asset: 0x779ded0c9e1022225f8e0630b35a9b54be713736 · Scheme: exact
Payment option 6
0.01 USDC
Atomic price: 10000 · Network: eip155:143 · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "payTo": "0x6B0F4651eD42893ab58139938175E4a69f175F25"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "10000",
    "payTo": "ATWJ82T8nRdQwZnaysB68N5EpaSvLRsQP4h6eWmaJBH9"
  },
  {
    "scheme": "exact",
    "network": "algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73k",
    "asset": "31566704",
    "amount": "10000",
    "payTo": "LOYVFSQ6ZTS2YWUW4GQ5L6VPP2TPIOXWYDACK53CPOHQQHLDMEMKJDXAX4"
  },
  {
    "scheme": "exact",
    "network": "stellar:pubnet",
    "asset": "CCW67TSZV3SSS2HXMBQ5JFGCKJNXKZM7UQUWUZPUTHXSTZLEO7SJMI75",
    "amount": "100000",
    "payTo": "GCH2J5UAY24YNKA65MPAATVKWRCZZRZNF3JZKYYS5MIBZPG6U7WJ6CDQ"
  },
  {
    "scheme": "exact",
    "network": "eip155:196",
    "asset": "0x779ded0c9e1022225f8e0630b35a9b54be713736",
    "amount": "10000",
    "payTo": "0x6B0F4651eD42893ab58139938175E4a69f175F25"
  },
  {
    "scheme": "exact",
    "network": "eip155:143",
    "asset": "0x754704Bc059F8C67012fEd69BC8A327a5aafb603",
    "amount": "10000",
    "payTo": "0x6B0F4651eD42893ab58139938175E4a69f175F25"
  }
]

Observed health

Status
Healthy
Latest latency
171 ms
Average latency
429 ms
HTTP status
402
Last checked
Reachability
100% over 11 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "url": {
          "type": "string",
          "description": "The x402 endpoint to diagnose (public http(s) URL)."
        },
        "method": {
          "type": "string",
          "enum": [
            "GET",
            "POST"
          ],
          "description": "HTTP method of the endpoint. Default: try GET, then POST."
        },
        "body": {
          "type": "string",
          "description": "Example JSON request body for a POST endpoint that checks its input before the 402 (implies POST, at most 16 KB). Without it, {} is sent and the requestBody example in the endpoint's /openapi.json is tried."
        }
      },
      "required": [
        "url"
      ]
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "method": {
          "enum": [
            "GET"
          ],
          "type": "string"
        },
        "queryParams": {
          "properties": {
            "body": {
              "description": "Example JSON request body for a POST endpoint that checks its input before the 402 (implies POST, at most 16 KB). Without it, {} is sent and the requestBody example in the endpoint's /openapi.json is tried.",
              "type": "string"
            },
            "method": {
              "description": "HTTP method of the endpoint. Default: try GET, then POST.",
              "enum": [
                "GET",
                "POST"
              ],
              "type": "string"
            },
            "url": {
              "description": "The x402 endpoint to diagnose (public http(s) URL).",
              "type": "string"
            }
          },
          "required": [
            "url"
          ],
          "type": "object"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "properties": {
            "challenge": {
              "type": [
                "object",
                "null"
              ]
            },
            "checks": {
              "items": {
                "properties": {
                  "group": {
                    "enum": [
                      "challenge",
                      "accepts",
                      "resource",
                      "settlement",
                      "wallets",
                      "discovery",
                      "browser"
                    ],
                    "type": "string"
                  },
                  "hint": {
                    "type": "string"
                  },
                  "id": {
                    "type": "string"
                  },
                  "message": {
                    "type": "string"
                  },
                  "status": {
                    "enum": [
                      "pass",
                      "warn",
                      "fail",
                      "info",
                      "skip"
                    ],
                    "type": "string"
                  }
                },
                "required": [
                  "id",
                  "status",
                  "message"
                ],
                "type": "object"
              },
              "type": "array"
            },
            "method": {
              "enum": [
                "GET",
                "POST",
                null
              ],
              "type": [
                "string",
                "null"
              ]
            },
            "overall": {
              "enum": [
                "pass",
                "warn",
                "fail"
              ],
              "type": "string"
            },
            "url": {
              "type": "string"
            },
            "wallets": {
              "description": "Which wallets can pay: per wallet, the networks where payment works (yes) and where it fails, with the reason (no).",
              "items": {
                "properties": {
                  "agent": {
                    "type": "boolean"
                  },
                  "no": {
                    "items": {
                      "properties": {
                        "network": {
                          "type": "string"
                        },
                        "reason": {
                          "type": "string"
                        }
                      },
                      "type": "object"
                    },
                    "type": "array"
                  },
                  "wallet": {
                    "type": "string"
                  },
                  "yes": {
                    "items": {
                      "type": "string"
                    },
                    "type": "array"
                  }
                },
                "type": "object"
              },
              "type": "array"
            }
          },
          "required": [
            "url",
            "overall",
            "checks"
          ],
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}