As of today, January 2nd 2018 (this can change in the future), the minimum RaiBlocks (XRB) deposit in Bitgrail is:
- 1 XRB (if you generated your address AFTER December 16th 2017).
- 100 XRB (if you generated your address BEFORE December 16th 2017).

Screenshot of the Bitgrail warning about the minimum XRB deposits.
NOTES AND CLARIFICATIONS
- The minimum XRB deposit can change in the future. Pay attention to the updates of the platform.