# Kronos X402 BTC Funding Arbitrage Signal

> Kronos X402 BTC Funding Arbitrage Signal is a paid API for AI agents from kronos-x402.vercel.app, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Fetches real-time cross-venue perpetual funding rates for BTC and computes gross/net arbitrage spreads between the best short and long venues across Binance, OKX, Bybit, KuCoin, Bitget, and Hyperliquid.

## Facts

- Endpoint: GET https://kronos-x402.vercel.app/api/v1/funding-arb/btc
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kronos-x402-btc-funding-arbitrage-signal-d7f084e0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kHARW1mNS_GGevJYNbHks

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 kronos-x402-btc-funding-arbitrage-signal-d7f084e0
```

Example prompt: What's the current BTC funding rate arbitrage spread across major crypto exchanges — give me the gross and net spread in bps, the annualized return, and tell me which venue I should short and which to long?

## When to prefer this

Use this endpoint when you need a real-time, multi-venue funding rate arbitrage signal specifically for BTC perpetuals, with fee-adjusted spread calculations and an actionability label already computed. Prefer this over manual aggregation when you want a single API call that covers Binance, OKX, Bybit, KuCoin, Bitget, and Hyperliquid simultaneously with annualized return context.

## Known failure modes

- One or more exchange APIs unavailable — partial data or error returned
- Payment of $0.02 USDC not processed — 402 Payment Required returned
- Rate limit exceeded on upstream exchange APIs — stale or missing venue rates
- BTC not supported or symbol mismatch — 404 or error response
- Network timeout on Vercel edge — 504 or empty response

## How this service works

Cross-venue funding arbitrage signal from real-time 8h-equivalent funding rates on Binance, OKX, Bybit, KuCoin, Bitget and Hyperliquid. Returns the gross and net-of-fees spread between the best short venue and best long venue (gross_spread_bps, net_spread_bps after a 20 bps round-trip fee estimate), spread_8h_normalized, venues_count, per-venue rates with funding_interval_hours, annualized_pct, and an actionability label. All 16 assets. $0.003 USDC via x402.

## Output

Returns gross_spread_bps (raw funding rate spread), net_spread_bps (after ~20 bps round-trip fee estimate), annualized_pct (annualized return of the arb), an actionability label indicating whether the opportunity is worth pursuing, and per-venue 8h-equivalent funding rates for Binance, OKX, Bybit, KuCoin, Bitget, and Hyperliquid. Signal is also recorded to Supabase asynchronously.

## 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",
     "properties": {}
    }
   },
   "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/kronos-x402-btc-funding-arbitrage-signal-d7f084e0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kronos-x402.vercel.app](https://www.zero.xyz/host/kronos-x402.vercel.app/llms.txt)