Pantera Research Lab built its study “Crypto on the Clock” on Surf prediction-market dataRead the study ↗Fundamentals
The venue-level state of prediction markets across Polymarket & Kalshi — headline numbers, volume, open interest, activity, and fees, plus the live market board.
The only API that matches Polymarket and Kalshi markets to each other — with the spread, the depth history, and the smart money behind every price.
Pulse
The state of the market at a glance — headline numbers right now, and each venue's latest day, 7-day, and 30-day totals on one board.
24h Notional Volume
Open Interest
30d Notional Volume
Resolved Outcomes Scored
fetching…
Get the pulse dataFetch the live venue metrics and the scored-outcome count shown above.View requestHide request
curl -s "https://api.asksurf.ai/gateway/v1/prediction-market/analytics" \ + -H "Authorization: Bearer $SURF_API_KEY" curl -s "$ORIGIN/api/pm/precompute/accuracy-by-venue"
The analytics response powers the first three tiles. The second request returns the exact scored-outcome snapshot used by tile four and needs no API key.
Venue Scoreboard
Latest, 7d and 30d performance by venue
Volume
Weekly traded volume and matched trades across both venues since 2024 — with the sports flow stripped out, and each category's venue split.
Spot Volume
Weekly traded volume by venue, since 2024
Run the source queryQuery the public warehouse data behind this chart.View requestHide request
curl -s -X POST "https://api.asksurf.ai/gateway/v1/onchain/sql" \
-H "Authorization: Bearer $SURF_API_KEY" -H "Content-Type: application/json" \
-d "{\"max_rows\":2000,\"sql\":\"SELECT toStartOfWeek(date) AS week, source, round(sum(notional_volume_usd)) AS volume_usd FROM agent.prediction_markets_daily GROUP BY week, source ORDER BY week\"}"Returns weekly rows for both venues. This chart displays the series from 2024 onward.
PolymarketKalshi
Spot Transactions
Weekly matched trades by venue — Polymarket on-chain fills, Kalshi exchange fills
Run the source queryQuery the public warehouse data behind this chart.View requestHide request
curl -s -X POST "https://api.asksurf.ai/gateway/v1/onchain/sql" \
-H "Authorization: Bearer $SURF_API_KEY" -H "Content-Type: application/json" \
-d "{\"max_rows\":2000,\"sql\":\"SELECT toStartOfWeek(block_date) AS week, sum(trade_count) AS trades FROM agent.polymarket_volume_daily GROUP BY week ORDER BY week\"}"
curl -s -X POST "https://api.asksurf.ai/gateway/v1/onchain/sql" \
-H "Authorization: Bearer $SURF_API_KEY" -H "Content-Type: application/json" \
-d "{\"max_rows\":2000,\"sql\":\"SELECT toStartOfWeek(created_time) AS week, count() AS trades FROM agent.kalshi_trades GROUP BY week ORDER BY week\"}"Run both queries, align the results by week, then stack the two trade-count series.
PolymarketKalshi
Volume Without Sports
Weekly notional volume excluding the Sports category — the non-sports business
Run the source queryQuery the public warehouse data behind this chart.View requestHide request
curl -s -X POST "https://api.asksurf.ai/gateway/v1/onchain/sql" \
-H "Authorization: Bearer $SURF_API_KEY" -H "Content-Type: application/json" \
-d "{\"max_rows\":2000,\"sql\":\"SELECT toStartOfWeek(date) AS week, source, round(sum(notional_volume_usd)) AS volume_usd FROM agent.prediction_markets_daily WHERE category != 'Sports' GROUP BY week, source ORDER BY week\"}"Returns weekly volume for both venues after removing the Sports category.
PolymarketKalshi
Venue Share by Category
Weekly volume share, Polymarket vs Kalshi — Crypto
Run the source queryQuery the public warehouse data behind this chart.View requestHide request
curl -s -X POST "https://api.asksurf.ai/gateway/v1/onchain/sql" \
-H "Authorization: Bearer $SURF_API_KEY" -H "Content-Type: application/json" \
-d "{\"max_rows\":2000,\"sql\":\"SELECT toStartOfWeek(date) AS week, source, round(sum(notional_volume_usd)) AS volume_usd FROM agent.prediction_markets_daily WHERE category = 'Crypto' GROUP BY week, source ORDER BY week\"}"Change the category in WHERE to Crypto, Politics, Sports, Economics, Financials, Culture, or STEM.
PolymarketKalshi
Open interest
Money locked in open positions — daily by venue over the trailing year, and weekly with sports stripped out.
Open Interest by Venue
End-of-day open interest per venue · trailing 365d · drag the timeline below the chart to zoom
PolymarketKalshi
Open Interest Without Sports
Open interest excluding Sports, measured at each week's end
Run the source queryQuery the public warehouse data behind this chart.View requestHide request
curl -s -X POST "https://api.asksurf.ai/gateway/v1/onchain/sql" \
-H "Authorization: Bearer $SURF_API_KEY" -H "Content-Type: application/json" \
-d "{\"max_rows\":2000,\"sql\":\"SELECT toStartOfWeek(date) AS week, source, round(argMax(oi, date)) AS open_interest_usd FROM (SELECT date, source, sum(open_interest_usd) AS oi FROM agent.prediction_markets_daily WHERE category != 'Sports' GROUP BY date, source) GROUP BY week, source ORDER BY week\"}"Open interest is a level: the query takes each week's last daily value instead of summing across days.
PolymarketKalshi
Activity, markets & fees
Who's active and what's tradable — daily active wallets and trades, markets that actually traded, and Polymarket's fee revenue.
Activity: Traders & Trades
Daily active wallets (Polymarket) and daily trades per venue
Active wallets
Daily trades
PolymarketKalshi
Actively Traded Markets
Distinct markets with ≥1 trade that day, per venue · independent panels & scales · trailing 365d
The Fee Switch
Daily protocol fee revenue + cumulative since the switch · Polymarket only
Daily feesCumulative
Live market board
The highest-volume markets live on both venues right now.
Top Markets Now
Top markets by 24h volume
Get the market board dataFetch the live markets returned by the public analytics API.View requestHide request
curl -s "https://api.asksurf.ai/gateway/v1/prediction-market/analytics" \ -H "Authorization: Bearer $SURF_API_KEY"
Read data.top_markets[]. This board keeps markets with a current price, a 5–95¢ probability, and at least $100K of 24-hour volume.
Builders
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The same tables and endpoints this page runs on — free tier, no card required.
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