# Hermes Data API – Crypto Price Lookup

> Hermes Data API – Crypto Price Lookup is a paid API for AI agents from x402-api-blond.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Returns real-time cryptocurrency price, 24h change, and metadata for a given symbol, sourced from CoinGecko, paid per-call via x402/USDC.

## Facts

- Endpoint: POST https://x402-api-blond.vercel.app/crypto/price
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/hermes-data-api-crypto-price-lookup-5627ab93
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Z0FCV-vSUasBAnn9aRjt5

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 hermes-data-api-crypto-price-lookup-5627ab93 -d '<json body>'
```

Example prompt: What's the current price of BTC in USD and how much has it changed in the last 24 hours? Use the CoinGecko-backed Hermes crypto price endpoint.

## When to prefer this

Choose this endpoint when you need real-time crypto spot prices with 24h change data sourced from CoinGecko, especially in agent workflows that support x402 micropayment protocols on Base/USDC. It is a good fit for pay-per-use contexts where you don't want a subscription API key, or when building autonomous agents that self-pay for data. Prefer alternatives if you need historical OHLCV data, order book depth, or bulk multi-asset pricing in a single call.

## Known failure modes

- Payment failure: x402 USDC payment on Base not completed or insufficient balance — request rejected
- Invalid or unsupported symbol: returns error if the cryptocurrency ticker is not recognized by CoinGecko
- CoinGecko upstream unavailable: downstream API outage causes delayed or missing price data
- Malformed MCP input schema: missing required fields like 'type' or 'toolName' causes 400-level error
- Rate limiting or quota exceeded on the upstream CoinGecko API

## How this service works

Pay-per-call data API: crypto prices (CoinGecko), China A-share quotes (Sina), weather (Open-Meteo), forex rates, and Ethereum gas fees. Payments via x402 protocol, USDC on Base.

## Output

Returns a JSON object with the Unix timestamp of the data, the data source (e.g. 'coingecko'), the requested symbol (e.g. 'BTC'), the current price in USD, and the 24-hour percentage price change.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "toolName",
    "inputSchema"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "mcp"
    },
    "example": {
     "type": "object"
    },
    "toolName": {
     "type": "string"
    },
    "description": {
     "type": "string"
    },
    "inputSchema": {
     "type": "object"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ts": 1750000000000,
  "source": "coingecko",
  "symbol": "BTC",
  "price_usd": 120000.5,
  "change_24h_pct": 2.3
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/hermes-data-api-crypto-price-lookup-5627ab93/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-api-blond.vercel.app](https://www.zero.xyz/host/x402-api-blond.vercel.app/llms.txt)