# x402 Base Tools – EIP-3009 Authorization Status Check

> x402 Base Tools – EIP-3009 Authorization Status Check is a paid API for AI agents from wt7tysfcmjm8fpzl.68r.lambda-web.us-east-1.on.aws, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).

Checks whether a specific EIP-3009 authorization nonce has been used and returns the authorizer's USDC balance on Base mainnet

## Facts

- Endpoint: GET https://wt7tysfcmjm8fpzl.68r.lambda-web.us-east-1.on.aws/v1/authorization?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-base-tools-eip-3009-authorization-status-check-88091352
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YKITpXnru1CILMjTeyhDe

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 x402-base-tools-eip-3009-authorization-status-check-88091352
```

Example prompt: Check if the EIP-3009 authorization nonce 0x3a1b2c... has already been used for wallet 0xAbCd... on Base, and tell me the wallet's current USDC balance.

## When to prefer this

Use this endpoint when you need to verify EIP-3009 USDC authorization status on Base mainnet before relaying a signed meta-transaction, or when you need to check a wallet's live USDC balance alongside nonce validity. Prefer this over generic RPC calls when you want pay-per-use pricing with no infrastructure setup, and when you need both nonce status and balance in a single call. Ideal for x402-enabled agent payment workflows on Base.

## Known failure modes

- Invalid nonce format (not 0x + 64 hex digits) returns an error
- Invalid authorizer address format returns an error
- RPC or chain read failure may return a 5xx error
- Non-existent nonce/authorizer returns result without charge but may return null/default values

## How this service works

Base mainnet data for agents, read live from the chain and paid per call in USDC: gas prices and costs, token prices from Uniswap and Aerodrome pools, balances, token info, transaction decoding, x402 payment checks, EIP-3009 authorization status, Basenames and address profiles. Lookups of things that do not exist are not charged.

## Output

Returns a JSON object with 'used' (boolean indicating whether the authorization nonce has already been consumed) and 'usdc_balance' (string representing the authorizer's current USDC balance on Base, e.g. '2.89'). If the authorization or wallet does not exist, the call is not charged.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "authorizer",
      "nonce"
     ],
     "properties": {
      "nonce": {
       "type": "string",
       "description": "the authorization nonce (0x + 64 hex digits)"
      },
      "authorizer": {
       "type": "string",
       "description": "the paying wallet (0x...)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "used": {},
      "usdc_balance": {}
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "used": false,
  "usdc_balance": "2.89"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-base-tools-eip-3009-authorization-status-check-88091352/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from wt7tysfcmjm8fpzl.68r.lambda-web.us-east-1.on.aws](https://www.zero.xyz/host/wt7tysfcmjm8fpzl.68r.lambda-web.us-east-1.on.aws/llms.txt)