# Currency Rate Lookup (cr4vvol)

> Currency Rate Lookup (cr4vvol) is a paid API for AI agents from cr4vvol.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Converts or looks up the exchange rate between two currencies via a pay-per-request API using USDC x402 payments.

## Facts

- Endpoint: POST https://cr4vvol.vercel.app/api/rate
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/currency-rate-lookup-cr4vvol-a95b993e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MaIJ7xvGDXdw0dxzJDONZ

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 currency-rate-lookup-cr4vvol-a95b993e -d '<json body>'
```

Example prompt: What's the current exchange rate from USD to EUR? Pay the $0.01 USDC fee per the x402 protocol.

## When to prefer this

Use this endpoint when you need a quick, pay-per-use currency rate lookup with no subscription or API key required, paying $0.01 USDC per call via x402. Prefer it for lightweight, on-demand FX rate queries in crypto-native or agent-based workflows.

## Known failure modes

- Missing or invalid 'from' or 'to' currency codes returns an error
- Unsupported currency pair may result in empty or null data
- Payment failure via x402 protocol blocks the request
- Network timeout on the Vercel deployment
- Ambiguous or misspelled currency codes may yield no result

## How this service works

Web scraping and search for AI agents. No auth, no subscriptions. Pay per request in USDC via x402.

## Output

Returns a JSON object with a 'success' boolean and a 'data' object containing the exchange rate or conversion details between the specified from and to currencies.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "to": {
   "type": "string",
   "description": "To currency"
  },
  "from": {
   "type": "string",
   "description": "From currency"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "type": "object"
  },
  "success": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/currency-rate-lookup-cr4vvol-a95b993e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cr4vvol.vercel.app](https://www.zero.xyz/host/cr4vvol.vercel.app/llms.txt)