# Kronos Signals CEX Premium – BTC Coinbase vs Composite Spot

> Kronos Signals CEX Premium – BTC Coinbase vs Composite Spot is a paid API for AI agents from kronossignals.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Returns the real-time Coinbase price premium for BTC relative to a composite spot median of OKX, Kraken, and Binance, expressed as a percentage.

## Facts

- Endpoint: GET https://kronossignals.com/api/v1/cex-premium/btc
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kronos-signals-cex-premium-btc-coinbase-vs-composite-spot-d92e45f1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Dv6roXYn9GK-HvjHyz5sr

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-signals-cex-premium-btc-coinbase-vs-composite-spot-d92e45f1
```

Example prompt: What's the current Coinbase price premium for BTC versus the global composite spot median — is it positive (US demand skew) or negative (global selling pressure)?

## When to prefer this

Use this endpoint when you need a fast, point-in-time signal of US/institutional crypto demand by measuring the Coinbase price premium over global exchanges. Ideal for trading agents, market monitors, or macro dashboards that want a reliable demand-skew indicator without storing or querying historical data. Prefer over raw price feeds when you specifically need inter-exchange premium analysis rather than absolute price levels.

## Known failure modes

- Asset not listed on Coinbase — endpoint only covers supported assets like BTC/ETH/SOL etc.
- Exchange data unavailable — one or more composite exchanges may be temporarily unreachable, affecting median calculation
- Payment failure — x402 micropayment of $0.02 USDC not completed or wallet lacks funds
- Rate limiting — too many calls in a short window may result in 429 responses
- Stale data — real-time feeds may have brief latency spikes during high volatility

## How this service works

Coinbase price premium vs composite spot median (OKX + Kraken + Binance). premium_pct = (coinbase / composite_median − 1) × 100. Positive = US/institutional demand skew; negative = global selling pressure. Covers BTC/ETH/SOL/XRP/DOGE/ADA/AVAX/LINK/DOT/LTC/BCH/ATOM/NEAR (assets listed on Coinbase). Point-in-time only — no historical baseline stored. $0.02 USDC per call via x402.

## Output

Returns a premium_pct value representing (Coinbase price / composite median of OKX+Kraken+Binance − 1) × 100 for BTC. Positive values indicate US or institutional demand skew; negative values indicate global selling pressure. Point-in-time only, no historical data included.

## 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"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object"
    },
    "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-signals-cex-premium-btc-coinbase-vs-composite-spot-d92e45f1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kronossignals.com](https://www.zero.xyz/host/kronossignals.com/llms.txt)