# x402 Web Probe – Blockchain Transaction Lookup (US Central)

> x402 Web Probe – Blockchain Transaction Lookup (US Central) is a paid API for AI agents from rockndefi.xyz:8443, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-22).

Fetches on-chain transaction details (status, gas, value, confirmations) for a given transaction hash on Base or Ethereum, paid per-call via x402/USDC.

## Facts

- Endpoint: GET https://rockndefi.xyz:8443/v1/chain/tx?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-web-probe-blockchain-transaction-lookup-us-central-8d96bd32
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dxjBElSGbhr_YuZrVwb8e

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-web-probe-blockchain-transaction-lookup-us-central-8d96bd32
```

Example prompt: Can you look up the transaction 0x142d15b73dfbf96c4a75a62079e8a1f4999916229734e0c28feafc752323e599 on Base and tell me if it succeeded, how many confirmations it has, and how much gas was used?

## When to prefer this

Choose this endpoint when you need a lightweight, no-account, pay-per-call transaction lookup on Base or Ethereum without setting up an API key with Etherscan, Alchemy, or Infura. Ideal for agents that need occasional, ad-hoc on-chain verification rather than bulk indexing. The x402 micropayment model makes it frictionless for low-frequency use.

## Known failure modes

- Invalid or malformed transaction hash returns an error
- Unsupported chain value (not 'base' or 'ethereum') causes rejection
- Transaction not yet indexed returns empty or pending state
- Network connectivity issues from US Central node may cause timeouts
- x402 payment failure results in HTTP 402 and no data returned

## How this service works

Pay-per-call website uptime/latency/TLS checks and fetch-to-Markdown, measured from US Central (St. Louis). USDC on Base via x402. No account or API key.

## Output

Returns a JSON object with: 'to' and 'from' wallet addresses, 'block' number, 'status' (success/failure), 'gas_used', 'value_eth' (amount transferred), and 'confirmations' count. No account required; payment is $0.002 USDC on Base via x402.

## 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": [
      "chain",
      "hash"
     ],
     "properties": {
      "hash": {
       "type": "string",
       "example": "0x142d15b73dfbf96c4a75a62079e8a1f4999916229734e0c28feafc752323e599",
       "description": "0x transaction hash"
      },
      "chain": {
       "type": "string",
       "example": "base",
       "description": "base or ethereum"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "to": "0x...",
  "from": "0x...",
  "block": 36000000,
  "status": "success",
  "gas_used": "52000",
  "value_eth": "0",
  "confirmations": 12
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-web-probe-blockchain-transaction-lookup-us-central-8d96bd32/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from rockndefi.xyz:8443](https://www.zero.xyz/host/rockndefi.xyz%3A8443/llms.txt)