GPIO voltage on Unmatched J8

I’ve looked through the various available manuals but haven’t been able to find this: what is the output voltage on the GPIO pins? 1.8V or 3.3V?

Page “FU740 - Misc”, of the schematics indicates that pin 2 of J8 (the GPIO header) supplies VDD_1V8, and the note below it that the I2C0 and I2C1 pins are 1v8-sensitive, so I would guess that holds for all the pins.

Yes, all I/O signals on J8 are 1.8V.

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Thank you for confirming!