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curl "https://api.polynode.dev/v3/perps/funding/btc?key=$POLYNODE_API_KEY"

{
  "data": [
    { "funding_rate": "0.0000125", "timestamp": 1783566000059 },
    { "funding_rate": "0.0000125", "timestamp": 1783562400068 }
  ],
  "more": true
}
Newest first, one entry per hourly funding event. Window with start_timestamp / end_timestamp (Unix ms): 
curl "https://api.polynode.dev/v3/perps/funding/btc?start_timestamp=1783000000000&key=$POLYNODE_API_KEY"
The current live rate and the next funding time are on the ticker. Rates are per funding interval (hourly) — multiply by 24×365 for an annualized figure.