# Xynaptic Crypto Screener

> Xynaptic Crypto Screener is a paid API for AI agents from api.xynaptic.io, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-02).

Returns top gainers, losers, highest volumes, and most extreme movers from the top 250 cryptocurrencies over the past 24 hours.

## Facts

- Endpoint: GET https://api.xynaptic.io/v1/crypto-screener?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/xynaptic-crypto-screener-e4d6ead3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IwkFk67YJbgrNXXLcMHqe

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 xynaptic-crypto-screener-e4d6ead3
```

Example prompt: Show me the top 5 crypto gainers and losers from the last 24 hours, including the biggest volume movers and most extreme price swings from the top 250 coins.

## When to prefer this

Choose this endpoint when you need a real-time attention-based crypto screener covering the top 250 coins — specifically to identify market leaders, laggards, and extreme movers by 24h performance and volume. Prefer it over generic price feeds when you want a pre-ranked, curated snapshot for trading signal generation or market briefings rather than raw price data for a specific coin.

## Known failure modes

- Invalid or out-of-range limit parameter returns an error or empty result
- Payment failure (x402) if USDC balance is insufficient
- Rate limiting if too many requests are made in a short window
- Stale data if upstream market feed is delayed
- Empty results if market data is temporarily unavailable

## How this service works

Xynaptic Crypto Screener — the market pulse: top gainers and losers 24h, highest volumes, most extreme moves from the top 250. GET ?limit=5. Fresh attention feed for trading agents.

## Output

A ranked list of cryptocurrencies from the top 250, segmented by top gainers, top losers, highest trading volumes, and most extreme price moves over the past 24 hours, with relevant market metrics for each asset.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/xynaptic-crypto-screener-e4d6ead3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.xynaptic.io](https://www.zero.xyz/host/api.xynaptic.io/llms.txt)