geld machen x402 agent utilities

Base Allowance Scan: Notable ERC-20 Approvals

base-allowance-scan

Read-onlyIdempotent

List notable ERC-20 allowances of a Base address (USDC/WETH/USDT/DAI/cbETH to DEX/bridge spenders). Use when checking approval risk of a wallet. Not for balances (use base-balance). 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

TableJSON Schema

Name	Required	Description	Default
`query`	No	Input for the paid endpoint: 0x Base address.

Output Schema

TableJSON 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.

Schema Changelog

Changes observed during successful MCP inspections.

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: 0x Base address."

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

A4.7/5.0

Behavior4/5

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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive), so the description earns credit for adding the commercial behavior instead: it returns a free sample plus a paid URL and pay steps, with no charge at this call and a stated $0.02 Base USDC x402 price for the full result. That is exactly the kind of context annotations cannot express; it only misses latency/rate-limit or partial-result behavior.

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

Conciseness5/5

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

Three tight sentences: capability first, then usage/exclusion, then return-and-pricing behavior. No filler, and the routing hint and cost disclosure are both placed where an agent will read them before invoking.

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?

An output schema exists, so return values need no elaboration, and the description still previews the shape (free sample + paid URL/pay steps). Combined with the token scope, wallet-risk use case, sibling exclusion, and pricing, an agent has everything needed to call this correctly and interpret the response.

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

Parameters4/5

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

Schema coverage is 100% and the schema already labels the single parameter as a '0x Base address', so the baseline is 3. The description adds scope meaning beyond the schema by fixing which tokens and spender categories the address is scanned for, which tells the agent what the query will actually return.

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 and resource ('List notable ERC-20 allowances of a Base address') and narrows scope with an explicit token/spender list (USDC/WETH/USDT/DAI/cbETH to DEX/bridge spenders). It also names the sibling it is not (base-balance), so an agent can separate it from adjacent tools without reading 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?

'Use when checking approval risk of a wallet' gives a concrete triggering scenario, and 'Not for balances (use base-balance)' supplies an explicit exclusion plus the alternative to route to. Nothing about when to pick this tool is left to inference.

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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