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HALOWERK marktwerk Cross-Exchange Price Comparison
x402
HALOWERK marktwerk Cross-Exchange Price Comparison is a paid API for AI agents from markt.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-12).
Queries Binance, Coinbase, Kraken, OKX, and Bybit in parallel for a BASE/QUOTE trading pair, returning current prices and optional order-book depth across exchanges with staleness tracking.
Price / call$0.003
Success—
StatusUnknown
How this service works
Queries Binance, Coinbase, Kraken, OKX and Bybit in parallel for one BASE/QUOTE pair, four seconds per exchange. An exchange that does not answer drops out with a stated reason and the call stays valid; venues_failed lists them. oldest_age_ms is mandatory and states the age of the oldest quote that entered the comparison, because differences taken from unequal points in time are the most common error in this kind of table. With an optional size the visible book of each exchange is walked as well
Output
A structured response containing the current price for the requested trading pair from each queried exchange queried in parallel, the age of the oldest quote (oldest_age_ms) for data freshness auditing, any exchanges that failed to respond (venues_failed) with stated reasons, and — when a size is provided — the executable average price derived from walking each exchange's visible order book for that order size.
Example use cases
Crypto arbitrage opportunity scanner
“Check the current BTC/USDT price on Binance, Coinbase, Kraken, OKX, and Bybit right now and tell me which exchange is highest and which is lowest, and how big the spread is between them.”
Best execution venue for large trade
“I need to buy 200 ETH and want to know which of Binance, OKX, and Bybit will give me the best average fill price — can you walk their order books for a 200 ETH order on the ETH/USDC pair?”
Real-time multi-exchange price dashboard
“Every minute, pull the SOL/USDT price from all five major exchanges — Binance, Coinbase, Kraken, OKX, and Bybit — and flag whenever any exchange is more than 0.5% away from the median.”
Technical details
Endpoint
POSThttps://markt.halowerk.com/cross-exchange?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to compare prices or executable costs for a single trading pair across multiple major centralized exchanges simultaneously, especially when data freshness is critical (oldest_age_ms guards against stale comparisons). It is ideal for arbitrage detection, best-execution routing, and cross-venue benchmarking. Prefer it over single-exchange ticker endpoints when the comparison itself is the goal, and over manual sequential calls when you need parallel, time-consistent data with drop-out resilience.
Side effects
- One or more exchanges fail to respond within 4 seconds — those venues appear in venues_failed with a reason and the call remains valid
- Invalid symbol format not matching BASE/QUOTE pattern returns a validation error
- All requested exchanges fail to respond — call may return an empty or error result
- Network timeout or connectivity issue to markt.halowerk.com
- Unsupported trading pair on a given exchange — that exchange may drop out with a reason
- Payment not provided or insufficient — x402 payment required error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| size | number | Optional order size in BASE. With it the executable average price per exchange is computed from the visible book. |
| symbol | string | Trading pair as BASE/QUOTE, for example ETH/USDC. |
| venues | array | Exchanges to compare. Without it all connected exchanges are used. |
Tags
x402
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