x402 Doctor

Check an x402 payment proof (free)

check_payment_proof

Read-only

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 to 10 calls per hour.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`header`	Yes	The PAYMENT-RESPONSE header value (base64 JSON)

Output Schema

TableJSON Schema

Name	Required	Description
`checks`	No
`decoded`	No	Transaction, network and payer named in the header
`onchain`	No	Whether the transaction exists and succeeded, and the USDC transfers
`overall`	Yes	pass, warn or fail
`explorer`	No	Explorer link for the transaction

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": {
+    "checks": {
+      "items": {
+        "additionalProperties": {},
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "decoded": {
+      "additionalProperties": {},
+      "description": "Transaction, network and payer named in the header",
+      "type": "object"
+    },
+    "explorer": {
+      "description": "Explorer link for the transaction",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "onchain": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Whether the transaction exists and succeeded, and the USDC transfers"
+    },
+    "overall": {
+      "description": "pass, warn or fail",
+      "type": "string"
+    }
+  },
+  "required": [
+    "overall"
+  ],
+  "type": "object"
+}

AddedOct 3, 2026

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