# x-402 USDC Address Transfer Lookup

> x-402 USDC Address Transfer Lookup is a paid API for AI agents from api.x-402.online, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).

Returns USDC ERC-20 transfer history (incoming and outgoing) for a Base address, with x402 payment settlements identified by EIP-3009 method, plus totals and sender stats.

## Facts

- Endpoint: GET https://api.x-402.online/v1/chain/address?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x-402-usdc-address-transfer-lookup-0911e0c5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3XCgKsHzhYT8elyruTWyy

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 x-402-usdc-address-transfer-lookup-0911e0c5
```

Example prompt: Show me all the USDC transfers — incoming and outgoing — for the Base address 0xABC...123, and highlight which ones are x402 settlements.

## When to prefer this

Choose this endpoint when you need a quick, structured summary of USDC (or other ERC-20) activity for a specific Base address, especially when you want x402 payment settlements automatically identified without building your own Blockscout query and EIP-3009 filter logic. It is ideal for merchant revenue audits, payment verification, and agent-driven accounting workflows on the Base chain. Prefer alternatives if you need multi-page history, multi-chain data, or non-ERC-20 native ETH transfers.

## Known failure modes

- Invalid or malformed Base address returns an error or empty results
- Unsupported token address causes fallback to USDC or error
- Only first page of transfers returned — historical data may be truncated without pagination support
- Blockscout data lag may mean very recent transfers are missing
- Address with no transfer history returns zeroed totals

## How this service works

See the USDC an address received and sent on Base, with x402 settlements identified. ERC-20 transfers of an address on Base, incoming and outgoing, with the x402 settlements identified by their EIP-3009 method. Totals, distinct senders, last settlement time. Default token is USDC. Data from Blockscout, first page, truncation declared. Query: ?address=&token=

## Output

A structured response containing paginated ERC-20 transfer records (first page) for the queried address on Base, with each transfer labeled as incoming or outgoing and x402 settlements flagged by their EIP-3009 method. Also includes aggregate totals for amount received and sent, count of distinct senders, and timestamp of the last x402 settlement. Truncation is declared when results exceed one page.

## 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",
     "properties": {}
    }
   },
   "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/x-402-usdc-address-transfer-lookup-0911e0c5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.x-402.online](https://www.zero.xyz/host/api.x-402.online/llms.txt)