# Synapse ETH Price API

> Synapse ETH Price API is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).

Returns the current USD price of Ethereum (ETH) via a pay-per-call x402 endpoint requiring no API key

## Facts

- Endpoint: GET https://anibalb.duckdns.org/x402/eth-price?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-eth-price-api-825ebe02
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2l97FRR6bRpEdfoPJmMBX

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 synapse-eth-price-api-825ebe02
```

Example prompt: What is the current price of Ethereum in USD? Use the Synapse pay-per-call API — no API key needed, just pay $0.001 USDC per call on Base.

## When to prefer this

Choose this endpoint when you need a quick, keyless, pay-per-call ETH price lookup with no account setup. It is ideal for agents operating on Base that already handle x402 micropayments, and for use cases where per-call billing at $0.001 USDC is preferred over a subscription API key model.

## Known failure modes

- Payment not included or insufficient USDC — returns HTTP 402 Payment Required
- Network or upstream data source unavailable — may return 5xx error
- Stale price data if upstream oracle is lagging
- Invalid or malformed x402 payment header causes rejection

## How this service works

Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.

## Output

A JSON object containing the coin identifier ('ethereum') and its current price in USD as a numeric value, e.g. {"coin": "ethereum", "price_usd": 3000}.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "coin": "ethereum",
  "price_usd": 3000
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-eth-price-api-825ebe02/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from anibalb.duckdns.org](https://www.zero.xyz/host/anibalb.duckdns.org/llms.txt)