# Nightshift USDC Transfer Verification

> Nightshift USDC Transfer Verification is a paid API for AI agents from 103-119-2-176.sslip.io:8445, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-31).

Verifies a Base USDC on-chain transfer by transaction hash, returning sender address, amount, block number, and replay-attack guard status.

## Facts

- Endpoint: POST https://103-119-2-176.sslip.io:8445/v1/verify-payment?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nightshift-usdc-transfer-verification-a0fecfa5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YCpaGflTeUlhdVOE-7YZs

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 nightshift-usdc-transfer-verification-a0fecfa5 -d '<json body>'
```

Example prompt: Can you verify that the Base USDC transaction 0xabc123... actually went through — I need to confirm the sender address, the amount in USDC, and the block it landed in, and make sure it hasn't been replayed?

## When to prefer this

Choose this endpoint when you need authoritative, on-chain verification of a specific Base USDC transfer and require replay-attack protection — especially in pay-per-access or x402-gated workflows where double-spend prevention is critical. Prefer it over off-chain payment webhooks or self-built RPC calls when you want a single-call answer with sender, amount, block, and replay guard bundled together.

## Known failure modes

- Invalid or malformed tx hash returns an error or verified:false
- Transaction not yet confirmed on Base returns unverified status
- Replay attack detected returns verified:false with replay flag
- Network or RPC timeout may cause delayed response
- Hash for a non-USDC or non-Base transaction may return incorrect or null amount

## How this service works

Pay-per-call Base USDC transfer verification over x402 (exact scheme). POST a tx hash, get on-chain verified sender/amount/block plus replay guard.

## Output

A JSON object containing the verified sender wallet address (from), the block number the transaction was included in (block), a boolean verified flag indicating on-chain confirmation and replay-guard status, and the USDC amount transferred (amount_usdc as a decimal string).

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "from": "0x…",
  "block": 53265431,
  "verified": true,
  "amount_usdc": "2.0"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nightshift-usdc-transfer-verification-a0fecfa5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 103-119-2-176.sslip.io:8445](https://www.zero.xyz/host/103-119-2-176.sslip.io%3A8445/llms.txt)