# Synapse Global Crypto Market Overview

> Synapse Global Crypto Market Overview is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).

Returns a global cryptocurrency market snapshot including BTC dominance percentage, total market cap in USD, and count of active cryptocurrencies.

## Facts

- Endpoint: GET https://anibalb.duckdns.org/x402/global-market?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-global-crypto-market-overview-5b82cfaa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_d4_UxxP8n1EdohX8pFeHd

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 synapse-global-crypto-market-overview-5b82cfaa
```

Example prompt: What's the current global crypto market cap, Bitcoin dominance percentage, and how many active cryptocurrencies are there right now?

## When to prefer this

Choose this endpoint when you need a fast, no-account, no-API-key global crypto market summary paid per-call in USDC via x402 on Base. Ideal for agents that need lightweight macro crypto context (BTC dominance, total market cap, active coin count) without subscribing to a full market data plan. Not suitable if you need per-coin prices, historical data, or granular altcoin breakdowns.

## Known failure modes

- Payment failure if USDC balance insufficient on Base network
- Upstream data provider unavailable — may return 503 or stale data
- Rate limiting if too many calls in short succession
- DuckDNS dynamic hostname may occasionally resolve incorrectly

## How this service works

Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.

## Output

A JSON object containing: btc_dominance_pct (Bitcoin's share of total crypto market cap as a percentage, e.g. 54.2), total_market_cap_usd (total crypto market capitalization in USD, e.g. 2.4 trillion), and active_cryptocurrencies (count of actively traded cryptocurrencies, e.g. 22501).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "btc_dominance_pct": 54.2,
  "total_market_cap_usd": 2400000000000,
  "active_cryptocurrencies": 22501
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-global-crypto-market-overview-5b82cfaa/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from anibalb.duckdns.org](https://www.zero.xyz/host/anibalb.duckdns.org/llms.txt)