# Arch Tools Crypto Market Cap

> Arch Tools Crypto Market Cap is a paid API for AI agents from archtools.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns the top N cryptocurrencies by market cap with prices in a specified fiat currency

## Facts

- Endpoint: POST https://archtools.dev/v1/tools/crypto-market-cap
- 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/arch-tools-crypto-market-cap-d09d519c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VpYdqI__HraZxOqe4Xv4j

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 arch-tools-crypto-market-cap-d09d519c -d '<json body>'
```

Example prompt: What are the top 20 cryptocurrencies by market cap right now, with prices in EUR?

## When to prefer this

Choose this endpoint when you need a quick, pay-per-call ranked list of top cryptocurrencies by market cap without managing API keys or subscriptions. It is ideal for AI agents that occasionally need crypto market snapshots and want a simple POST interface with micropayment billing via x402/USDC on Base.

## Known failure modes

- Invalid currency code returns an error or falls back to USD default
- Limit value out of supported range may return an error or be clamped
- Upstream market data provider outage may cause stale or empty responses
- Payment failure (insufficient USDC balance) results in 402 response blocking the call

## How this service works

Arch Tools — crypto-market-cap

## Output

A JSON object containing a ranked list of top cryptocurrencies including their names, symbols, current prices in the requested fiat currency, and market capitalization data.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "integer",
   "default": 10,
   "description": "Number of top coins to return"
  },
  "currency": {
   "type": "string",
   "default": "usd",
   "description": "Fiat currency for prices"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/arch-tools-crypto-market-cap-d09d519c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from archtools.dev](https://www.zero.xyz/host/archtools.dev/llms.txt)