x402 Doctor

Deep check of an x402 endpoint before an expensive payment ($0.01 via x402)

x402_preflight_deep

Read-only

Paid ($0.01 USDC via x402 on Base or Solana): 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 domains. Never pays the endpoint. Worth it before a payment above about $1; for an ordinary call x402_preflight is enough. Same as GET /api/v1/preflight/deep. 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
`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)
`max_usd`	No	Your budget per call in USD, e.g. 0.5
`network`	No	CAIP-2 network you want to pay on, e.g. eip155:8453

Output Schema

TableJSON Schema

Name	Required	Description
`url`	No
`accepts`	No	Only on an unpaid call: the x402 payment options
`options`	No
`reasons`	No
`receipt`	No	Signed receipt (EIP-191) binding the answer to your arguments
`summary`	No
`verdict`	No	go: pay; caution: ask first; no_go: do not pay
`safe_to_pay`	No

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/options/anyOf/0"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Only on an unpaid call: the x402 payment options"
+    },
+    "options": {
+      "anyOf": [
+        {
+          "items": {
+            "additionalProperties": {},
+            "type": "object"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "reasons": {
+      "anyOf": [
+        {
+          "$ref": "#/properties/options/anyOf/0"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "receipt": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Signed receipt (EIP-191) binding the answer to your arguments"
+    },
+    "safe_to_pay": {
+      "type": [
+        "boolean",
+        "null"
+      ]
+    },
+    "summary": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "url": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "verdict": {
+      "description": "go: pay; caution: ask first; no_go: do not pay",
+      "type": [
+        "string",
+        "null"
+      ]
+    }
+  },
+  "type": "object"
+}

AddedSep 29, 2026

TDQS

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