# Semilla1 Lab txcheck — Batch Transaction Lookup

> Semilla1 Lab txcheck — Batch Transaction Lookup is a paid API for AI agents from semilla1-txcheck.netlify.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-28).

Looks up 1–10 Base mainnet transaction hashes and returns status, gas usage, ETH value, and USDC transfer details for each.

## Facts

- Endpoint: GET https://semilla1-txcheck.netlify.app/txs?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/semilla1-lab-txcheck-batch-transaction-lookup-30043538
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ivZZc4w8H2a-_REw6Y2Mp

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 semilla1-lab-txcheck-batch-transaction-lookup-30043538
```

Example prompt: Can you check what happened in Base transaction 0x811a2f5f216a87810a8ce59e645836544df7a4b5a66b0a3b048087a904637168 — did it succeed, how much gas did it use, and were there any USDC transfers?

## When to prefer this

Choose this endpoint when you need a quick, structured summary of one or more Base mainnet transactions — especially when you care about USDC token transfers in the logs, which standard RPC calls don't surface cleanly. It is ideal for payment verification, DeFi audit trails, and on-chain receipt confirmation. Prefer it over raw RPC calls when you want a normalized JSON response with USDC transfer decoding included, and when batching up to 10 hashes to minimize round trips.

## Known failure modes

- Hash not found on Base mainnet — returns {hash, error} in results array
- Invalid hash format — rejected by regex validation before payment
- More than 10 hashes submitted — exceeds batch limit
- RPC/network timeout fetching transaction from Base — possible partial results
- Payment (x402) not included or insufficient — 402 response before data is returned

## How this service works

Resumen de una transacción de Base: estado, gas, transferencias USDC. Pago x402 v2: 0.01 USDC en Base (lote de hasta 10: 0.05 USDC; /balance, /tokens, /receipt: 0.005 USDC).

## Output

Returns a JSON object with a count of hashes received, how many were found, and an array of per-transaction summaries. Each summary includes the tx hash, status ('ok' or 'fallida'), block number, from/to addresses, ETH value sent, gas used, fee in ETH, and an array of USDC transfer events (each with from, to, and USDC amount). If a hash was not found or is invalid, that entry returns a hash+error object instead.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "queryParams"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "required": [
      "hashes"
     ],
     "properties": {
      "hashes": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{64}(,0x[0-9a-fA-F]{64}){0,9}$",
       "description": "1 a 10 hashes de tx de Base mainnet separados por coma"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "count",
      "found",
      "results"
     ],
     "properties": {
      "count": {
       "type": "integer",
       "description": "Hashes recibidos"
      },
      "found": {
       "type": "integer",
       "description": "Hashes encontrados"
      },
      "results": {
       "type": "array",
       "items": {
        "type": "object",
        "required": [
         "hash",
         "status",
         "block",
         "from",
         "to",
         "eth",
         "gasUsed",
         "feeEth",
         "usdcTransfers"
        ],
        "properties": {
         "to": {
          "type": [
           "string",
           "null"
          ],
          "description": "Destino (null si creó contrato)"
         },
         "eth": {
          "type": "number",
          "description": "ETH enviado en la tx"
         },
         "from": {
          "type": "string",
          "description": "Remitente"
         },
         "hash": {
          "type": "string",
          "description": "Hash consultado"
         },
         "block": {
          "type": "integer",
          "description": "Número de bloque"
         },
         "feeEth": {
          "type": "number",
          "description": "Comisión pagada en ETH"
         },
         "status": {
          "enum": [
           "ok",
           "fallida"
          ],
          "type": "string",
          "description": "Estado del reci
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 1,
  "found": 1,
  "results": [
   {
    "to": "0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789",
    "eth": 0,
    "from": "0x1278c1e48e3c9548a5d9f2b16dc27ed311b0697c",
    "hash": "0x811a2f5f216a87810a8ce59e645836544df7a4b5a66b0a3b048087a904637168",
    "block": 52920980,
    "feeEth": 0.000009421146,
    "status": "ok",
    "gasUsed": 1570191,
    "usdcTransfers": [
     {
      "to": "0xa4ba7f4fca58c50df7232ba65e8d794f78dc65bc",
      "from": "0x26572ff23c6c52bfb1a69cb0c9114a8be443b422",
      "usdc": 1
     }
    ]
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/semilla1-lab-txcheck-batch-transaction-lookup-30043538/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from semilla1-txcheck.netlify.app](https://www.zero.xyz/host/semilla1-txcheck.netlify.app/llms.txt)