# SperaxOS Crypto ETFs Data API

> SperaxOS Crypto ETFs Data API is a paid API for AI agents from chat.sperax.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-20).

Retrieves AI-powered intelligence data on crypto ETFs, payable per-request via x402/USDC on Base

## Facts

- Endpoint: HEAD https://chat.sperax.io/api/x402/v1/data/crypto-etfs?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/speraxos-crypto-etfs-data-api-9ba2f6e7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3I_b0PxYZMM39qONEX0vY

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-crypto-etfs-data-api-9ba2f6e7 -d '<json body>'
```

Example prompt: Pull the latest crypto ETF data from SperaxOS — I want to see what funds are listed and their key details, and pay per request with USDC on Base.

## When to prefer this

Choose this endpoint when you need on-demand, pay-per-use crypto ETF intelligence without managing API keys, especially in autonomous agent workflows operating on Base with USDC micropayment capability via the x402 protocol.

## Known failure modes

- Payment insufficient or missing — returns HTTP 402 with payment requirements
- Invalid or missing Base wallet — request rejected
- No ETF data available matching filters — empty result set
- Network or provider downtime — 5xx error
- Malformed properties filter — 400 bad request

## 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 structured data about crypto ETFs available in the market, including fund metadata and AI-curated DeFi intelligence, delivered as a response to a per-request USDC micropayment via the x402 protocol on Base.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/speraxos-crypto-etfs-data-api-9ba2f6e7/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)