InstrumentsService instrumentsService = IntxServiceFactory.createInstrumentsService(client);
GetHistoricalFundingRatesRequest request = new GetHistoricalFundingRatesRequest.Builder()
    .instrumentId("BTC-PERP")
    .build();
GetHistoricalFundingRatesResponse response = instrumentsService.getHistoricalFundingRates(request);

For more information, please visit the INTX Java SDK.