x402 Doctor

Check up to 10 x402 endpoints before paying ($0.005 via x402)

x402_preflight_batch

Read-only

Paid ($0.005 USDC via x402 on Base or Solana): the pre-payment check for up to 10 x402 endpoints at once. Per endpoint go, caution or no_go, the recommended payment option and why, plus totals. For marketplaces and agents that weigh several services. Never pays the endpoints. Same as GET /api/v1/preflight/batch. 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
`urls`	Yes	The x402 endpoints to check (public http(s) URLs), at most 10
`method`	No	HTTP method of the paid route (default: GET, then POST)
`max_usd`	No	Your budget per call in USD, e.g. 0.05
`network`	No	CAIP-2 network you want to pay on, e.g. eip155:8453

Output Schema

TableJSON Schema

Name	Required	Description
`count`	No
`counts`	No	How many go, caution, no_go and unknown
`accepts`	No	Only on an unpaid call: the x402 payment options
`receipt`	No	Signed receipt (EIP-191) binding the answer to your arguments
`results`	No	One preflight per endpoint

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/results/anyOf/0"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Only on an unpaid call: the x402 payment options"
+    },
+    "count": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "counts": {
+      "anyOf": [
+        {
+          "additionalProperties": {
+            "type": "number"
+          },
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "How many go, caution, no_go and unknown"
+    },
+    "receipt": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Signed receipt (EIP-191) binding the answer to your arguments"
+    },
+    "results": {
+      "anyOf": [
+        {
+          "items": {
+            "additionalProperties": {},
+            "type": "object"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "One preflight per endpoint"
+    }
+  },
+  "type": "object"
+}

AddedSep 29, 2026

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