Sendo
Shut down
What they do:
The best SMS/RCS API for startups
Quick facts:
HQ: New York, NY, United States
Y Combinator Winter 2022 Startups
This list has 398 startups and was last updated on Oct 15, 2026. 81 of them are hiring right now. Biggest hubs: San Francisco (105), New York (51), and Los Angeles (15). Largest teams: Kapital Bank, Remedial Health, and beU delivery. Latest round: WhiteLab Genomics raised €23.2M (Oct 6, 2026).
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Kable
Shut down
What they do:
Usage-based billing for API companies
Quick facts:
HQ: Los Angeles, CA, United States