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BTC Kalshi-Polymarket Arbitrage Monitor (x402)
x402
BTC Kalshi-Polymarket Arbitrage Monitor (x402) is a paid API for AI agents from browser-worker-v2-production.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-19).
Returns matched Kalshi and Polymarket US BTC 15-minute BRTI contract data to surface real-time arbitrage opportunities between the two prediction markets.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call market-data API for matched Kalshi and Polymarket US BTC 15-minute BRTI contracts. x402 v2, Base mainnet USDC.
Output
A JSON object containing matched BTC 15-minute BRTI contract data from both Kalshi and Polymarket, including contract prices, implied probabilities or values, spread information, and optionally the echoed requestId for correlation. Enables side-by-side comparison to identify arbitrage opportunities.
Example use cases
Real-time arb opportunity scanner
“Check the current Kalshi and Polymarket BTC BRTI contract prices and tell me if there's a meaningful spread I could arb between the two markets right now.”
Automated prediction market bot
“Every minute, fetch the latest matched BTC 15-minute BRTI quotes from Kalshi and Polymarket and alert me whenever the spread exceeds 2 cents — use request ID 'bot-run-001' so I can track the calls.”
Crypto trading research dashboard
“I'm building a report on Bitcoin prediction market efficiency — can you grab the current matched Kalshi vs Polymarket BRTI contract data so I can see how closely the two markets are aligned?”
Technical details
Endpoint
GEThttps://browser-worker-v2-production.up.railway.app/api/btc-kalshi-polymarket-arbitrage?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need real-time, matched BTC 15-minute BRTI contract pricing from both Kalshi and Polymarket in a single call, specifically to identify arbitrage opportunities. Prefer this over scraping each market independently when you need pre-matched contract pairs and want to pay only per call via x402 micropayments rather than managing API subscriptions to both platforms separately.
Side effects
- Payment not received or USDC transaction fails — endpoint returns HTTP 402 and no data
- Kalshi or Polymarket API is down — endpoint may return partial data or an error indicating upstream unavailability
- No matched contracts found for the current 15-minute window — response may be empty or indicate no active matching contracts
- Invalid request_id format — likely echoed as-is but may cause unexpected correlation issues
- Rate limiting or Railway infrastructure outage — HTTP 5xx response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_id | string | Optional client correlation identifier, echoed as requestId in the JSON response. |
Output
Schema · Response
{
"type": "object"
}Tags
x402
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