A coins-by-venues funding heatmap: green where funding is negative (longs get paid), red where it is positive (longs pay), with per-asset spread highlighted to surface delta-neutral arbitrage.
Each row is an asset, each column a venue. Deep red means longs are paying a high funding rate; green means shorts pay longs. A row mixing both colours is an arbitrage candidate — the spread between its extremes is the harvestable rate.
When the same asset funds at very different rates on two venues, a delta-neutral pair (long where funding is negative, short where it is positive) collects both legs. Check the spread persistence in the funding history before sizing.
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