# USDC Receipt Verifier (Base Mainnet)

> USDC Receipt Verifier (Base Mainnet) is a paid API for AI agents from usdc-receipt-verifier.soloearn.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-15).

Verifies that a specific Base mainnet transaction transferred at least a minimum amount of USDC to a given address, optionally checking sender and confirmation count.

## Facts

- Endpoint: GET https://usdc-receipt-verifier.soloearn.workers.dev/v1/verify?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/usdc-receipt-verifier-base-mainnet-9aef401c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9eo6YUIXbB1PzBSFSH4-K

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 usdc-receipt-verifier-base-mainnet-9aef401c
```

Example prompt: Can you verify that transaction 0xabc123...def456 on Base mainnet actually sent at least 10 USDC to 0xRecipient...Address, and confirm it has at least 3 confirmations?

## When to prefer this

Use this endpoint when you need a lightweight, read-only way to programmatically confirm that a specific Base mainnet transaction paid a sufficient USDC amount to a recipient — especially in payment-gated workflows (x402 or custom), digital goods delivery, or subscription activation where you need cryptographic receipt proof without running your own blockchain node.

## Known failure modes

- Transaction hash not found on Base mainnet — returns verified: false
- Transfer amount below specified minimum — returns verified: false
- Recipient address mismatch — returns verified: false
- Sender address mismatch when 'from' is specified — returns verified: false
- Insufficient confirmations — returns verified: false
- Invalid address or transaction hash format — likely 4xx error
- RPC or network connectivity issues may cause transient failures

## How this service works

Verify that a Base mainnet transaction paid at least N USDC to an address (optionally from a given sender, with K confirmations). Returns matched transfer, block time and confirmations. Read-only.

## Output

Returns a JSON object with a 'verified' boolean indicating whether the transaction meets the criteria, along with a status code, the matched USDC transfer details, block timestamp, and number of confirmations at the time of the query.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "const": "GET"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "tx",
      "to",
      "min"
     ],
     "properties": {
      "to": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$"
      },
      "tx": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{64}$"
      },
      "min": {
       "type": "string"
      },
      "from": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$"
      },
      "confirmations": {
       "type": "string"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "code": {
     "type": "string"
    },
    "verified": {
     "type": "boolean"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/usdc-receipt-verifier-base-mainnet-9aef401c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from usdc-receipt-verifier.soloearn.workers.dev](https://www.zero.xyz/host/usdc-receipt-verifier.soloearn.workers.dev/llms.txt)