# Grey Ridge Signals — Crypto Price Feed (Base Chain, x402)

> Grey Ridge Signals — Crypto Price Feed (Base Chain, x402) is a paid API for AI agents from x402-data-api.sigrunner.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-29).

Returns real-time spot prices for major crypto assets (BTC, ETH, SOL, LINK, etc.) on Base chain, settled inline via x402 micropayment at $0.005 USDC per call.

## Facts

- Endpoint: GET https://x402-data-api.sigrunner.workers.dev/chain/prices?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/grey-ridge-signals-crypto-price-feed-base-chain-x402-3504a2ff
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vvv-l9bA8en5sqxeF5iMg

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 grey-ridge-signals-crypto-price-feed-base-chain-x402-3504a2ff
```

Example prompt: What are the current prices of BTC, ETH, SOL, and LINK on Base right now — I need live spot prices for my trading bot with no API key setup?

## When to prefer this

Choose this endpoint when your agent needs real-time crypto spot prices on Base chain with zero account setup or API key — ideal for autonomous trading bots, DeFi agents, or portfolio tools that can settle micropayments inline via x402. Prefer over free-tier APIs when you need guaranteed pay-per-call access without rate-limit concerns or key management overhead.

## Known failure modes

- Payment not received or x402 handshake fails — endpoint returns 402 Payment Required
- Invalid or unsupported asset symbol — may return empty price entry or error
- Network/worker timeout — Cloudflare worker may return 503 under load
- Stale price data if upstream oracle is lagging — no explicit freshness guarantee in schema

## How this service works

Pay-per-call market & on-chain data for Base trading agents over x402: live DeFi yields, cross-venue funding rates, token prices, Polymarket and RPC data — plus a pre-trade token-safety gate (GO/HOLD/BLOCK). No account, no API key; agents pay inline in USDC from $0.001/call.

## Output

A JSON object containing the chain name ('base') and a prices map keyed by asset symbol (e.g. BTC, ETH, SOL, LINK) with their current USD spot prices as floats. Example: {chain: 'base', prices: {BTC: 100000.5, ETH: 3500.1, SOL: 104.2, LINK: 12.5}}.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": "base",
  "prices": {
   "BTC": 100000.5,
   "ETH": 3500.1,
   "SOL": 104.2,
   "LINK": 12.5
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/grey-ridge-signals-crypto-price-feed-base-chain-x402-3504a2ff/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-data-api.sigrunner.workers.dev](https://www.zero.xyz/host/x402-data-api.sigrunner.workers.dev/llms.txt)