Bitcoin Polymarket mispricing — share vs spot, every second.
When Bitcoin moves, Polymarket BTCshare prices don't move with it tick-for-tick. They move with the Chainlink oracle that resolves the market — and that oracle lags by seconds, sometimes longer. The gap between the live exchange price and the lagged oracle is exactly what our crypto bundle exposes, refreshed every second.
BTC is up 1.2% on Binance in the last 30 seconds. Chainlink hasn't updated yet. The Polymarket YES at 'BTC ≥ $76,500' is still pricing the lagged oracle. That's the gap.
Two endpoints. The full mispricing picture.
/v1/crypto/oracle-lag/BTC/v1/crypto/spread/BTC# Live BTC oracle lag curl -H "X-API-Key: $DPM_KEY" \ "https://api.datapolymarket.com/v1/crypto/oracle-lag/BTC?minutes=5" # In Claude Code (via MCP) > "Find Polymarket BTC markets where Chainlink lags Binance by >0.4%"
Why the BTCoracle lags (and why that's the trade)
Polymarket BTC markets resolve on the Chainlink BTC/USD aggregator. The aggregator updates on a deviation+heartbeat schedule, not tick-for-tick.
The aggregator updates when one of two things happens: enough oracle nodes report a new price that crosses the deviation threshold, or the heartbeat fires (every hour or so). Between updates, the on-chain price is by definition stale. Polymarket markets that resolve on this aggregator therefore price a slow-moving truth — even though the real-world BTC price is moving every millisecond.
For a casual punter that's just trivia. For a Polymarket trader it's a structural mispricing. If the Chainlink number is going to update upward in the next 30 seconds and a YES share at the threshold is trading like the old number, the expected value flips before the oracle does. That window — from when the underlying crosses the threshold to when the oracle reports it — is the trade.
We don't guess at the trade. We give you both numbers, side by side, every second, with the gap precomputed. Whether you market-make against it or just take the obvious shares is up to you.
BTC mispricing data, free for 3 days.
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