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graphadvocate.com kalshi-polymarket spread
https://graphadvocate.com/kalshi-polymarket/spread
answers 402
Cross-source arbitrage spread between Kalshi and Polymarket on a topic. POST {topic, limit?}. Pulls matching markets from both venues (Politics + Elections overlap heavily), computes price mid-spread + arbitrage direction. JOIN that single-source passthrough APIs (incl. Pinax Token API) structurally can't return — this is what survives Pinax shipping Kalshi support later.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.05
- Network
- base
- Pay to
- 0x0FF5A6ecef783BBA35463ec2F8403B9B5e9e7C86
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 192 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-08-15T14:30:55.154Z (1h ago)
- Category
- finance-crypto
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fgraphadvocate.com%2Fkalshi-polymarket%2Fspread"