Base says applications for Base Batches 004, its fourth startup accelerator cohort, will close September 10 at 11:59 p.m. PST. Earlier program details listed September 9 as the deadline, while the latest announcement gives applicants an additional day. About 10 selected early-stage teams will receive up to $100,000 from the Base Ecosystem Fund, eight weeks of virtual mentorship and a Demo Day in New York City, listed previously for November 17. The program targets founders building primarily for Base, from the pitch-deck stage through post-MVP and before a formal seed round, with particular interest in trading, payments and asset issuance. Applications require written and video submissions, and the portal does not save drafts. Base launched the accelerator in 2025 and runs it twice a year.