# EVM Internal Transaction Lookup

> EVM Internal Transaction Lookup is a paid API for AI agents from x402helper.xyz, paid per call via x402, $0.013/call, status unknown (last checked 2026-11-07).

Looks up details of an internal EVM transaction by hash on a specified blockchain network via Blockscout

## Facts

- Endpoint: GET https://x402helper.xyz/89e509/evm/internal-tx?utm_source=zero.xyz
- Price: $0.013/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-07
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-internal-transaction-lookup-fbe48333
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VlrU94dfE_yxsf5vnRnNn

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 evm-internal-transaction-lookup-fbe48333
```

Example prompt: Can you look up the internal transaction details for hash 0x3a1b2c... on the Base network?

## When to prefer this

Use this endpoint when you need to inspect internal (sub-call) transaction details on an EVM-compatible chain — particularly useful for debugging DeFi interactions, verifying internal token transfers, or auditing contract-to-contract calls that don't appear as top-level transactions.

## Known failure modes

- Invalid or malformed transaction hash returns an error
- Transaction hash not found on the specified network
- Unsupported network specified
- Network congestion may cause slow Blockscout responses
- Hash exists on a different chain than specified

## How this service works

X402 micropayments server — AI agents pay USDC for OFAC screening, rates, and billing verification.

## Output

Returns a JSON object with success status and a result object containing internal transaction details retrieved from Blockscout for the specified EVM network and transaction hash.

## 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": [
      "tx"
     ],
     "properties": {
      "tx": {
       "type": "string",
       "default": null,
       "description": "Transaction hash, 0x + 64 hex"
      },
      "network": {
       "enum": [
        "base",
        "ethereum",
        "arbitrum",
        "optimism",
        "polygon"
       ],
       "type": "string",
       "default": null,
       "description": "EVM network with a Blockscout host (default base)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {},
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-internal-transaction-lookup-fbe48333/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402helper.xyz](https://www.zero.xyz/host/x402helper.xyz/llms.txt)