In Episode 40 of The Bootstrapped Tech Founder, Lucas and Luna unpack how bootstrapped software companies are using an API-first strategy to generate consistent subscription revenue. They focus on the case of Plaid, which started as a small API for connecting bank accounts and grew to power thousands of apps, all without venture capital initially. Lucas explains the key decisions Plaid's founders made: building a single endpoint that solved a painful problem, pricing per connection, and avoiding feature bloat. Luna challenges whether API-first works for all bootstrappers, and they discuss alternatives like Stripe's early days and the rise of embedded finance APIs. The conversation covers the trade-offs: slower initial growth but higher margins, the importance of developer experience, and why bootstrapped founders should consider selling access rather than software. This episode offers a concrete playbook for any founder building a B2B API product without outside funding.