# EMC2 AI Top Tokens by Market Cap

> EMC2 AI Top Tokens by Market Cap is a paid API for AI agents from emc2ai.io, paid per call via x402, $0.4/call, status unknown (last checked 2026-09-13).

Returns a ranked list of top cryptocurrency tokens by market cap, including price, volume, and supply metrics.

## Facts

- Endpoint: POST https://emc2ai.io/x402/bitquery/top-tokens/raw
- Price: $0.4/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/emc2ai-io-9d8fac05
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ktbTVn-vqRcs_u7kg2Ayc

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 emc2ai-io-9d8fac05 -d '<json body>'
```

Example prompt: Show me the top 20 cryptocurrency tokens ranked by market cap right now, including their current price, 24h trading volume, and circulating supply.

## When to prefer this

Use this endpoint when you need a snapshot of the top-ranked crypto tokens by market cap with accompanying price, volume, and supply data — especially when you want raw on-chain sourced data via Bitquery rather than a centralized exchange feed. Prefer this over generic market APIs when building DeFi dashboards, token screeners, or crypto market overviews.

## Known failure modes

- Invalid or missing request parameters returns 400 error
- Payment not provided or insufficient USDC returns 402 Payment Required
- Bitquery upstream timeout or data unavailability returns 503
- Rate limiting exceeded returns 429
- No tokens match filter criteria returns empty result set

## How this service works

Top tokens ranked by market cap with price, volume, and supply metrics.

## Output

A ranked list of top cryptocurrency tokens with market cap, current price, trading volume, and supply metrics, sourced via Bitquery blockchain data.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "enum": [
    "base",
    "ethereum",
    "bsc",
    "arbitrum",
    "polygon",
    "optimism",
    "solana"
   ],
   "type": "string",
   "description": "Blockchain to query (e.g., base, ethereum, bsc, solana)"
  },
  "limit": {
   "type": "string",
   "description": "Maximum number of results to return (default: 10, max: 500)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/emc2ai-io-9d8fac05/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from emc2ai.io](https://www.zero.xyz/host/emc2ai.io/llms.txt)