# x402 Bitcoin Dominance API

> x402 Bitcoin Dominance API is a paid API for AI agents from x402-api-production-bd43.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Returns Bitcoin's current market dominance as a percentage of total crypto market capitalization

## Facts

- Endpoint: GET https://x402-api-production-bd43.up.railway.app/dominance?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-bitcoin-dominance-api-4a109b67
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AsI8mXpKmQSYg9bND9W5A

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 x402-bitcoin-dominance-api-4a109b67
```

Example prompt: What's Bitcoin's current market dominance percentage — can you grab the live BTC dominance data for me?

## When to prefer this

Choose this endpoint when you need a quick, low-cost ($0.01 USDC) real-time Bitcoin dominance figure without requiring a full exchange API integration or CoinMarketCap/CoinGecko account. Ideal for lightweight agents that need a single dominance datapoint for trading signals, dashboards, or market condition checks. The x402 micropayment model makes it suitable for pay-per-call agent workflows.

## Known failure modes

- Network or upstream data source unavailability returning 5xx errors
- Payment failure if USDC balance is insufficient for the $0.01 per-call fee
- Invalid format parameter value returning a 400 error
- Rate limiting or quota exceeded on the Railway-hosted service

## How this service works

Paid API endpoints for prices, weather, FX, news, gas, dominance, fear/greed, ATH, and more

## Output

Returns Bitcoin's current dominance as a percentage of total crypto market capitalization (e.g. 52.4%). The format parameter can adjust the response format, defaulting to percent. Response is a lightweight JSON payload with the current dominance value.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "format": {
   "type": "string",
   "description": "Response format (default: percent)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-bitcoin-dominance-api-4a109b67/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-api-production-bd43.up.railway.app](https://www.zero.xyz/host/x402-api-production-bd43.up.railway.app/llms.txt)