# EVM Internal Transaction Tracer

> EVM Internal Transaction Tracer is a paid API for AI agents from payai.agentstools.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Lists the internal transactions (nested contract calls, value transfers, and call types) of a given EVM transaction hash via Blockscout

## Facts

- Endpoint: GET https://payai.agentstools.dev/evm/internal-tx
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-internal-transaction-tracer-fd0560ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HVhX2_wLdTELU9fcCltOT

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-tracer-fd0560ed
```

Example prompt: Can you show me all the internal transactions and nested contract calls for Ethereum transaction 0x4e3a3754410177e6937ef1f84bba68ea139e8d1f1f7f8af234b6fde7a9f6a86? I want to understand the full call tree and value transfers hidden inside it.

## When to prefer this

Use this endpoint when you need to understand what actually happened inside a complex EVM transaction beyond what the top-level receipt exposes — particularly for DeFi swaps, multi-hop calls, proxy contracts, or debugging unexpected ETH movements. Prefer this over a basic transaction lookup when the call tree and internal value flow are needed.

## Known failure modes

- Invalid or malformed transaction hash returns an error
- Transaction hash not found on the specified network
- Rate limiting from upstream Blockscout degrades gracefully rather than returning an error
- Unsupported network name returns validation error
- Transaction has no internal calls, returning an empty list

## How this service works

List the internal transactions of an EVM transaction: the nested contract calls and their value transfers and call types, via Blockscout. Reveals the value flow and call tree that a plain receipt hides. Rate-limited upstream degrades gracefully rather than erroring.

## Output

A structured list of internal transactions within the given EVM transaction, including each nested contract call, its type (call, delegatecall, etc.), the from/to addresses, value transferred, and the hierarchical call tree showing how execution flowed between contracts.

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-internal-transaction-tracer-fd0560ed/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from payai.agentstools.dev](https://www.zero.xyz/host/payai.agentstools.dev/llms.txt)