402shield

Server Details

x402 payment security and pre-execution transaction risk screening for autonomous AI agents.

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Status: Healthy
Last Tested: 2026-10-08 08:38
Transport: Streamable HTTP · MCP 2025-11-25
URL

TDQS

B3.4/5.0

Scored 2026-10-07 17:00 across 1 tool

Disambiguation5/5

There is only one tool, so there is no possibility of confusing it with another tool. Its purpose is clearly stated as preparing a paid 402Shield pre-execution safety check.

Naming Consistency5/5

With a single tool named preflight_payment, there is no mixed naming convention to create inconsistency. The snake_case name is readable and unambiguous in context.

Tool Count3/5

A single tool is thin for an MCP server surface, even though it matches a narrow paid-check adapter purpose. It falls below the typical well-scoped 3-15 tool range.

Completeness3/5

The tool only prepares the paid check and returns an endpoint; the MCP surface does not include tools to execute payment, retrieve the verdict, or check status directly. This is a notable lifecycle gap for agents needing end-to-end coverage.

Available Tools

1 tool

preflight_payment402Shield Preflight PaymentInspect

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.

ParametersJSON Schema

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

Output Schema

ParametersJSON Schema

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

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

1 tool updateOct 8, 2026

Changedpreflight_payment1 field changed

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"
+}

1 tool updateOct 7, 2026
- First observedpreflight_payment

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