# claw402 Coinank Coin Market Cap

> claw402 Coinank Coin Market Cap is a paid API for AI agents from claw402.ai, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).

Retrieves cryptocurrency market capitalization data for a specified base coin via a pay-per-call x402 USDC payment gateway

## Facts

- Endpoint: GET https://claw402.ai/api/v1/coinank/coin/market-cap
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/claw402-coinank-coin-market-cap-b3778196
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SjfB3Elmsyh1LFe4qhhax

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 claw402-coinank-coin-market-cap-b3778196
```

Example prompt: What's the current market cap for Bitcoin? Use the coinank market cap endpoint — pay with USDC from my wallet, no API key needed.

## When to prefer this

Choose this endpoint when you need cryptocurrency market cap data without registering for an API key or managing credentials — ideal for lightweight, on-demand lookups paid per-call with USDC via the x402 protocol. Best suited for agents operating in a crypto-native environment with wallet-based micropayment capability.

## Known failure modes

- Payment not received or insufficient USDC balance — returns 402 Payment Required
- Missing or invalid baseCoin query parameter — may return empty data array or error code
- Unknown or unsupported coin symbol — returns empty data array
- Service downtime from vergex.trade backend — returns 5xx error
- Rate limiting or wallet-based throttling — returns 429 Too Many Requests

## How this service works

Backed by vergex.trade. Pay for any API with USDC. No API keys. No registration. Just a wallet.

## Output

A JSON object with a code field (0 for success) and a data array containing market capitalization information for the specified cryptocurrency. The structure is minimal and may include market cap values, rankings, and related coin metrics depending on the baseCoin queried.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "baseCoin": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "code": 0,
  "data": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/claw402-coinank-coin-market-cap-b3778196/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from claw402.ai](https://www.zero.xyz/host/claw402.ai/llms.txt)