# Sift Web Tools – Crypto Transaction Lookup

> Sift Web Tools – Crypto Transaction Lookup is a paid API for AI agents from sift.srv1996466.hstgr.cloud, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-23).

Looks up details of a blockchain transaction by hash and returns block number, status, native value, and token transfers

## Facts

- Endpoint: GET https://sift.srv1996466.hstgr.cloud/v1/crypto/tx?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sift-web-tools-crypto-transaction-lookup-5fe79f8f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_u5Jg1vTeFsYKvfBntDS05

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 sift-web-tools-crypto-transaction-lookup-5fe79f8f
```

Example prompt: Can you look up the blockchain transaction 0x4e3a...f82c on Base and tell me whether it succeeded, what block it landed in, and whether any tokens were transferred?

## When to prefer this

Choose this endpoint when an agent needs to programmatically verify the outcome of a specific blockchain transaction — especially on Base — including its confirmation status, block placement, native ETH value, and ERC-20/token transfer events. It is pay-per-call with no subscription required and only charges on success, making it suitable for on-demand agent workflows that don't query transactions at high frequency.

## Known failure modes

- Invalid or malformed transaction hash returns an error response
- Transaction hash not found on the specified chain returns not-found error
- Unsupported chain identifier causes an error
- Payment not processed (non-200) means no charge is made but no data is returned
- Network or upstream RPC timeout may cause temporary failures

## How this service works

Transaction details: status, from, to, value, fee, token transfers. Looks up a transaction hash on ethereum, base, arbitrum, optimism or polygon: status, block, time, from, to, value, gas fee, method id and every ERC-20 transfer in it.

## Output

Returns a JSON object containing the block number the transaction was included in, its status (e.g. 'success' or 'failed'), the native value transferred, and an array of token transfer events associated with the transaction.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "hash"
     ],
     "properties": {
      "hash": {
       "type": "string",
       "description": "Transaction hash"
      },
      "chain": {
       "type": "string",
       "description": "Chain (default base)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "block": 52772746,
  "status": "success",
  "value_native": 0,
  "token_transfers": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sift-web-tools-crypto-transaction-lookup-5fe79f8f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sift.srv1996466.hstgr.cloud](https://www.zero.xyz/host/sift.srv1996466.hstgr.cloud/llms.txt)