# SperaxOS Etherscan Data API (x402)

> SperaxOS Etherscan Data API (x402) is a paid API for AI agents from chat.sperax.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-23).

Retrieves on-chain Ethereum data via Etherscan, payable per-request with USDC on Base using the x402 protocol — no API key required.

## Facts

- Endpoint: GET https://chat.sperax.io/api/x402/v1/data/etherscan?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/speraxos-etherscan-data-api-x402-5df695bd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TI5v8JVsDPylj3hLa5btI

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-etherscan-data-api-x402-5df695bd
```

Example prompt: Pull the full transaction history for Ethereum address 0xAbC...123 from Etherscan — I need to see all ERC-20 token transfers and ETH sends.

## When to prefer this

Choose this endpoint when you need trustless, pay-per-request access to Etherscan data without managing API keys, especially useful for AI agents operating autonomously with a crypto wallet on Base. Ideal for on-demand Ethereum on-chain lookups in DeFi workflows where microtransaction payment (x402) is already supported.

## Known failure modes

- Invalid Ethereum address format returns an error
- Payment of 0.001 USDC via x402 not included causes 402 Payment Required response
- Etherscan rate limits or downtime may cause upstream errors
- Querying a non-existent transaction hash returns empty or not-found result
- Missing required query parameters returns a 400-level error

## 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

Returns Etherscan on-chain data such as transaction lists, token balances, contract events, or block information for the queried Ethereum address or entity, delivered as structured JSON.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/speraxos-etherscan-data-api-x402-5df695bd/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)