# SperaxOS Internal Transactions Lookup

> SperaxOS Internal Transactions Lookup is a paid API for AI agents from chat.sperax.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-16).

Retrieves internal (trace-level) transactions for a given wallet or contract address on EVM-compatible chains

## Facts

- Endpoint: POST https://chat.sperax.io/api/x402/tools/internal-txs/getInternalTxs?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/speraxos-internal-transactions-lookup-916a6d84
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kZtBKDAu_HSViwBfaXDio

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-lookup-916a6d84 -d '<json body>'
```

Example prompt: Show me the last 50 internal transactions for wallet address 0xAbC...123 on Arbitrum, starting from block 18000000.

## When to prefer this

Use this endpoint when you need to inspect internal (trace-level) transaction activity — i.e. contract-to-contract calls and ETH transfers that don't appear as top-level transactions — for a specific address across major EVM chains including Ethereum, Arbitrum, Polygon, Optimism, and Base. Prefer this over external transaction endpoints when you need to understand what happened beneath the surface of a transaction, such as internal calls made by DeFi protocols or value flows within a smart contract. It's pay-per-request with no API key required, making it ideal for agents needing on-demand blockchain tracing without upfront credential setup.

## Known failure modes

- Invalid or malformed wallet/contract address returns an error
- Unsupported chain name returns a validation error
- Start block greater than end block returns empty results or an error
- No internal transactions found in the given block range returns an empty list
- Rate limiting or payment failure via x402 protocol results in a 402 Payment Required response
- Extremely wide block ranges with high activity may time out or be truncated

## 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) for the specified address on the chosen EVM chain, including details such as calling contract addresses, value transferred, block numbers, and call type — up to the specified limit and bounded by the optional start/end block range.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "type": "string",
   "default": "ethereum",
   "description": "Chain: ethereum, arbitrum, polygon, optimism, base"
  },
  "limit": {
   "type": "number",
   "default": 20,
   "description": "Max results (default 20)"
  },
  "address": {
   "type": "string",
   "description": "Wallet or contract address"
  },
  "endBlock": {
   "type": "number",
   "description": "End block number"
  },
  "startBlock": {
   "type": "number",
   "default": 0,
   "description": "Start block number"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/speraxos-internal-transactions-lookup-916a6d84/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)