Developed and delivered the Bloomfilter API for the coinbase/x402 repository, enabling users to register domains and manage DNS records through a single API call. This backend feature eliminated the need for user accounts or credit cards during onboarding, streamlining the process and reducing friction for new users. The work involved API development and productization, with careful integration into the existing product catalog. Using JSON for data interchange and focusing on backend development, the solution accelerated time-to-first-domain and supported user adoption goals. The release demonstrated disciplined scope management and clear feature ownership, with no major bugs reported during the delivery period.