x402 Doctor

Diagnose an x402 endpoint ($0.01 via x402)

x402_diagnose

Read-only

Paid ($0.01 USDC via x402 on Base or Solana): 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/OpenAPI discovery and the browser paywall. Returns every check with pass/warn/fail and a fix hint. For the endpoint's owner or a developer debugging it; to decide whether to pay someone else's endpoint, use x402_preflight. Same as GET /api/v1/diagnose. The answer carries a signed receipt (EIP-191, bound to your arguments) that proves later which verdict you got.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`url`	Yes	The x402 endpoint (public http(s) URL), e.g. https://api.example.com/paid
`method`	No	HTTP method of the paid route (default: GET, then POST)

Output Schema

TableJSON Schema

Name	Required	Description
`url`	No
`checks`	No	Every check with its status, message and hint
`accepts`	No	Only on an unpaid call: the x402 payment options
`overall`	No	pass, warn or fail (absent on the payment requirement)
`receipt`	No	Signed receipt (EIP-191) binding the answer to your arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 9, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": true,
+  "properties": {
+    "accepts": {
+      "anyOf": [
+        {
+          "$ref": "#/properties/checks/anyOf/0"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Only on an unpaid call: the x402 payment options"
+    },
+    "checks": {
+      "anyOf": [
+        {
+          "items": {
+            "additionalProperties": {},
+            "type": "object"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Every check with its status, message and hint"
+    },
+    "overall": {
+      "description": "pass, warn or fail (absent on the payment requirement)",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "receipt": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Signed receipt (EIP-191) binding the answer to your arguments"
+    },
+    "url": {
+      "type": [
+        "string",
+        "null"
+      ]
+    }
+  },
+  "type": "object"
+}

First observedSep 25, 2026

TDQS

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