geld machen x402 agent utilities

Payment Receipt Auditor: Is This 402 Settle Real?

payment-receipt-auditor

Read-onlyIdempotent

Verify an x402 PAYMENT-RESPONSE or settle tx hash on Base before retrying a paid call. Use when a paid call failed or looks unsettled and you need proof. Not for pre-launch payload checks (use facilitator-dry-run). Returns a free sample plus the paid URL and pay steps (no charge here); the full result costs $0.02 Base USDC via x402.

Input Schema

Name	Required	Description	Default
`query`	No	Input for the paid endpoint: settle tx hash 0x… or PAYMENT-RESPONSE JSON.

Output Schema

Name	Required	Description
`sku`	Yes
`note`	No
`payTo`	No
`price`	No
`method`	No
`network`	No
`paid_url`	Yes
`how_to_pay`	Yes
`teaser_url`	No
`your_input`	No
`free_teaser`	No	Free sample output of this SKU (truncated); null if unavailable.
`ready_request`	No	Exact paid HTTP request (method, url with your input, optional json_body) to send with an x402 client.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 7, 2026

addedOutput schema / properties / ready_request

Added value: +{
+  "description": "Exact paid HTTP request (method, url with your input, optional json_body) to send with an x402 client."
+}

Changed1 schema field changedOct 6, 2026

addedOutput schema / properties / free_teaser

Added value: +{
+  "description": "Free sample output of this SKU (truncated); null if unavailable."
+}

Changed1 schema field changedOct 6, 2026

changedInput schema / properties / query / description

Previous value: -"Optional input (e.g. url / address / text) to pass to the paid endpoint as ?q= or JSON body."New value: +"Input for the paid endpoint: settle tx hash 0x… or PAYMENT-RESPONSE JSON."

Changed1 schema field changedOct 6, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "how_to_pay": {
+      "type": "string"
+    },
+    "method": {
+      "type": "string"
+    },
+    "network": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "note": {
+      "type": "string"
+    },
+    "paid_url": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "payTo": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "price": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "sku": {
+      "type": "string"
+    },
+    "teaser_url": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "your_input": {}
+  },
+  "required": [
+    "sku",
+    "paid_url",
+    "how_to_pay"
+  ],
+  "type": "object"
+}

First observedOct 6, 2026

TDQS

A4.6/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare the safe-read profile (readOnlyHint, idempotentHint, non-destructive), and the description layers on the non-obvious commercial behavior: a free sample plus paid URL, no charge on this call, and the $0.02 Base USDC x402 cost of the full result. That payment/retry semantics is exactly the context the annotations cannot convey.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three tightly packed sentences that front-load the core action and the routing exclusion. The final pricing sentence is information-dense but earns its place by stating the cost model up front.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a single-parameter, annotated, read-only tool with an output schema, the description supplies everything an agent needs: trigger, exclusion, payment cost, and free-sample behavior. Nothing material is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% and there is only one parameter, so the schema already documents the input. The description reiterates the same accepted forms (0x… hash or PAYMENT-RESPONSE JSON), adding little beyond the schema; baseline 3 is warranted.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb (Verify) and resource (x402 PAYMENT-RESPONSE or settle tx hash on Base), with the exact artifact being audited named. It explicitly distinguishes itself from the sibling facilitator-dry-run, so an agent can route without opening either schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives a clear trigger ('when a paid call failed or looks unsettled and you need proof') and an explicit exclusion with the alternative named ('Not for pre-launch payload checks (use facilitator-dry-run)'). Both when-to-use and when-not-to-use are covered.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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