# SperaxOS Internal Transactions by Hash

> SperaxOS Internal Transactions by Hash is a paid API for AI agents from chat.sperax.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-20).

Retrieves internal transactions (sub-calls) for a given transaction hash on a specified blockchain

## Facts

- Endpoint: POST https://chat.sperax.io/api/x402/tools/internal-txs/getInternalTxsByHash?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/speraxos-internal-transactions-by-hash-2d76e018
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_csjp8az2RxKLT4KBqE5Rx

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 speraxos-internal-transactions-by-hash-2d76e018 -d '<json body>'
```

Example prompt: Can you pull up the internal transactions for Ethereum tx hash 0x4a3b...f92c? I want to see all the sub-calls and internal value transfers that happened inside that transaction.

## When to prefer this

Use this endpoint when you need to inspect the internal sub-calls and value transfers within a specific blockchain transaction — especially for DeFi transactions involving multiple contract interactions. Prefer this over a simple transaction lookup when the top-level tx data is insufficient and you need full execution trace detail. Best suited for Ethereum and other EVM-compatible chains supported by SperaxOS.

## Known failure modes

- Invalid or malformed transaction hash returns an error
- Unsupported chain name returns an error or empty result
- Transaction hash not found on the specified chain returns empty or 404
- Network timeouts for deeply nested or complex transactions
- Payment failure via x402 if insufficient USDC balance

## How this service works

AI-powered DeFi intelligence APIs payable via the x402 HTTP payment protocol. No API key required — pay per request with USDC on Base. Identity-only (SIWX) endpoints are free for wallets with an agentcash identity.

## Output

A list of internal transactions (traces/sub-calls) associated with the given transaction hash, including details such as the from/to addresses, value transferred, function calls, call type, gas usage, and any nested contract interactions that occurred within the parent transaction.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "type": "string",
   "default": "ethereum",
   "description": "Chain"
  },
  "txHash": {
   "type": "string",
   "description": "Transaction hash"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/speraxos-internal-transactions-by-hash-2d76e018/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chat.sperax.io](https://www.zero.xyz/host/chat.sperax.io/llms.txt)