402shield

402Shield Preflight Payment

preflight_payment

Prepare the exact paid 402Shield request that must be completed before an autonomous payment executes. Submit the returned POST request with an x402-capable client. The paid response is ALLOW, REVIEW, or BLOCK. Execute the intended payment only after ALLOW; REVIEW and BLOCK should stop execution by default. Price: $0.005 USDC.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`policy`	No
`expected`	No
`requestId`	No
`requested`	Yes
`transaction`	No
`transactionPolicy`	No
`expectedTransaction`	No
`simulateTransaction`	No

Output Schema

TableJSON Schema

Name	Required	Description	Default
`url`	Yes
`body`	Yes
`price`	Yes
`action`	Yes
`method`	Yes
`network`	Yes
`service`	Yes
`advisory`	Yes
`contentType`	Yes
`executionRule`	Yes
`paymentRequired`	Yes
`expectedDecisionValues`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 8, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "additionalProperties": false,
+  "properties": {
+    "action": {
+      "const": "execute_x402_request",
+      "type": "string"
+    },
+    "advisory": {
+      "const": true,
+      "type": "boolean"
+    },
+    "body": {
+      "additionalProperties": {},
+      "propertyNames": {
+        "type": "string"
+      },
+      "type": "object"
+    },
+    "contentType": {
+      "const": "application/json",
+      "type": "string"
+    },
+    "executionRule": {
+      "type": "string"
+    },
+    "expectedDecisionValues": {
+      "items": {
+        "enum": [
+          "ALLOW",
+          "REVIEW",
+          "BLOCK"
+        ],
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "method": {
+      "const": "POST",
+      "type": "string"
+    },
+    "network": {
+      "type": "string"
+    },
+    "paymentRequired": {
+      "const": true,
+      "type": "boolean"
+    },
+    "price": {
+      "const": "$0.005",
+      "type": "string"
+    },
+    "service": {
+      "const": "402Shield",
+      "type": "string"
+    },
+    "url": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "service",
+    "action",
+    "method",
+    "url",
+    "price",
+    "network",
+    "contentType",
+    "body",
+    "paymentRequired",
+    "expectedDecisionValues",
+    "executionRule",
+    "advisory"
+  ],
+  "type": "object"
+}

First observedOct 7, 2026

TDQS

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