# Monid X402 Crypto Price Lookup (Pay-Per-Call)

> Monid X402 Crypto Price Lookup (Pay-Per-Call) is a paid API for AI agents from x402-proxy.monid.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Returns the current price and symbol for a specified cryptocurrency using CoinGecko coin ID, requiring a $0.05 USDC micropayment via x402 on Base per call.

## Facts

- Endpoint: GET https://x402-proxy.monid.workers.dev/api/crypto/:coinId
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/monid-x402-crypto-price-lookup-pay-per-call-fba74c42
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-mde_vsHAzuX9pmb2mtnp

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 monid-x402-crypto-price-lookup-pay-per-call-fba74c42
```

Example prompt: What's the current price of Bitcoin? Use the Monid pay-per-call crypto lookup with coin ID 'bitcoin'.

## When to prefer this

Choose this endpoint when you need a simple, on-demand cryptocurrency price lookup for a specific CoinGecko-listed coin and are operating in a micropayment-capable (x402/Base USDC) environment. Ideal for agents that need spot prices without a long-term API subscription, or when integrating pay-per-use crypto data into automated workflows.

## Known failure modes

- Invalid or unknown coinId returns an error or empty coins object
- Payment failure or insufficient USDC balance causes 402 Payment Required response
- Network or proxy timeout results in no data returned
- Unsupported coin IDs not listed on CoinGecko return empty or error response

## How this service works

Pay-per-call API proxy reselling Monid tools via x402 payments on Base. Each endpoint requires a USDC micropayment before returning data.

## Output

A JSON object containing the coin's current price in USD and its ticker symbol, keyed by a prefixed CoinGecko identifier (e.g. {"coins": {"coingecko:bitcoin": {"price": 79000, "symbol": "BTC"}}}).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "queryParams": {
     "coinId": {
      "type": "string",
      "description": "CoinGecko coin ID"
     }
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "example": {
     "type": "object",
     "properties": {
      "coins": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "coins": {
   "coingecko:bitcoin": {
    "price": 79000,
    "symbol": "BTC"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/monid-x402-crypto-price-lookup-pay-per-call-fba74c42/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-proxy.monid.workers.dev](https://www.zero.xyz/host/x402-proxy.monid.workers.dev/llms.txt)