# GPUOps Blockchain Transaction Lookup

> GPUOps Blockchain Transaction Lookup is a paid API for AI agents from chain.gpuops.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).

Looks up a blockchain transaction by hash and chain, returning transaction details across 7 supported chains, paid per-call with USDC on Base via x402.

## Facts

- Endpoint: POST https://chain.gpuops.io/v1/transaction
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gpuops-blockchain-transaction-lookup-09f3b63b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cb9xFVkZaqQFx5WH931yh

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 gpuops-blockchain-transaction-lookup-09f3b63b -d '<json body>'
```

Example prompt: Can you look up the transaction with hash 0xabc123...def on Ethereum and tell me the sender, receiver, value, and confirmation status?

## When to prefer this

Choose this endpoint when you need lightweight, pay-per-call transaction lookups across multiple chains without committing to a subscription-based blockchain data provider. Especially useful for agents that only occasionally need on-chain transaction data across heterogeneous chains (up to 7), and where per-call USDC micropayments via x402 are preferable to API key management.

## Known failure modes

- Invalid or malformed transaction hash returns an error or empty result
- Unsupported chain identifier causes a bad request error
- Transaction not yet indexed (too recent) may return not found
- Payment failure via x402 if USDC balance is insufficient blocks the request
- Network-level timeouts if the target chain RPC is slow or unavailable

## How this service works

Multi-chain blockchain data API. 7 chains. x402 pay-per-call with USDC on Base.

## Output

Returns structured transaction details for the specified hash on the given chain, including sender and receiver addresses, value transferred, block number, timestamp, confirmation status, gas fees, and other chain-specific metadata.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "hash": {
   "type": "string"
  },
  "chain": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gpuops-blockchain-transaction-lookup-09f3b63b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chain.gpuops.io](https://www.zero.xyz/host/chain.gpuops.io/llms.txt)