x402 Doctor

Quick x402 endpoint check (free)

x402_quick_check

Read-only

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).

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
`next`	No
`overall`	Yes	pass, warn or fail
`failures`	Yes
`warnings`	Yes
`top_problems`	Yes	Up to three problems, failures first

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": {
+    "failures": {
+      "type": "number"
+    },
+    "next": {
+      "type": "string"
+    },
+    "overall": {
+      "description": "pass, warn or fail",
+      "type": "string"
+    },
+    "top_problems": {
+      "description": "Up to three problems, failures first",
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "url": {
+      "type": "string"
+    },
+    "warnings": {
+      "type": "number"
+    }
+  },
+  "required": [
+    "overall",
+    "failures",
+    "warnings",
+    "top_problems"
+  ],
+  "type": "object"
+}

First observedSep 25, 2026

TDQS

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