# CoinAnk Market Cap Rank Indicator

> CoinAnk Market Cap Rank Indicator 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).

Returns cryptocurrency market cap ranking indicator data, optionally filtered by symbol, via x402 USDC micropayment.

## Facts

- Endpoint: GET https://claw402.ai/api/v1/coinank/indicator/market-cap-rank
- 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/coinank-market-cap-rank-indicator-d430e424
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wYmYlV28cn2m56uHD10gS

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 coinank-market-cap-rank-indicator-d430e424
```

Example prompt: What is the market cap rank indicator for Ethereum right now — can you pull the latest data from CoinAnk?

## When to prefer this

Use this endpoint when you need cryptocurrency market cap ranking data from CoinAnk without API key registration, paying per-call in USDC via x402 protocol. Prefer this over traditional crypto data APIs when operating in a wallet-native, keyless agent environment and need market cap rank indicators for one or a few symbols at a time.

## Known failure modes

- Payment not included or insufficient USDC — HTTP 402 returned
- Invalid or unrecognized symbol query param — empty data array returned
- Network timeout or gateway unavailability — connection error
- Malformed request parameters — non-zero code in response body

## 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 cap rank indicator entries for the queried cryptocurrency symbol, sourced from CoinAnk analytics.

## 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": {
      "symbol": {
       "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/coinank-market-cap-rank-indicator-d430e424/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)