# Approval Revoke MCP - Spender Reputation API

> Approval Revoke MCP - Spender Reputation API is a paid API for AI agents from approval-revoke-mcp.mtree.workers.dev, paid per call via x402, $0.050000/call, status unknown (last checked 2026-09-15).

Returns reputation intelligence and provenance evidence for a given spender address to support token approval revocation decisions by autonomous agents

## Facts

- Endpoint: POST https://approval-revoke-mcp.mtree.workers.dev/v1/spender/reputation
- Price: $0.050000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/approval-revoke-mcp-mtree-workers-dev-3590ce39
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GyDXCaB6W2XrAWfD0Lg2K

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability approval-revoke-mcp-mtree-workers-dev-3590ce39 -d '<json body>'
```

Example prompt: Can you check the spender reputation for contract address 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 — I want to know if it's safe to keep my token approval or if I should revoke it?

## When to prefer this

Use this endpoint when an autonomous agent needs to evaluate whether a specific spender address is trustworthy before deciding to revoke or maintain a token approval on Base or EVM-compatible chains. Prefer this over generic contract scanners when you need structured, machine-readable reputation evidence with provenance specifically designed for approval-revocation workflows.

## Known failure modes

- Invalid or malformed spender address returns an error response
- Payment of 0.05 USDC not received or payment header missing results in 402 Payment Required
- Unknown spender address with no on-chain history may return empty or low-confidence evidence
- Network timeout on Cloudflare Worker returns 5xx error
- Rate limiting or quota exceeded returns 429 Too Many Requests

## How this service works

Paid approval revoke mcp route for autonomous agents. Returns JSON with provenance, route-specific evidence, and machine-readable fields. Buyer-intent match: spender reputation API, approval revoke intelligence. Price 0.05 USDC on Base via x402. Demo/preview: https://approval-revoke-mcp.mtree.workers.dev/demo/reputation. Contact: https://approval-revoke-mcp.mtree.workers.dev/contact.

## Output

A JSON response containing a spender reputation score, provenance metadata, route-specific on-chain evidence, and machine-readable fields that help an agent decide whether to revoke a token approval for the queried spender address.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "properties": {
      "url": {
       "type": "string"
      },
      "query": {
       "type": "string"
      }
     },
     "additionalProperties": true
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/approval-revoke-mcp-mtree-workers-dev-3590ce39/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from approval-revoke-mcp.mtree.workers.dev](https://www.zero.xyz/host/approval-revoke-mcp.mtree.workers.dev/llms.txt)