Locus, a Y Combinator Fall 2025 company in San Francisco, opened self-serve access to Locus Pro on August 27. Founder and CEO Cole Dermott announced the change on X. The company account repeated it.
Locus Pro is a prepaid meter for paid APIs that software agents call. Dermott said a user can sign up, paste one MCP server URL, turn on tools, and reach providers such as OpenAI, Anthropic, Firecrawl, ElevenLabs, and Exa without opening a separate vendor account for each. He said there is no monthly minimum and that a balance can be topped up from $5. The company account added that there is no sales call and no seat minimum.
Locus's own Pro documentation currently lists 3,847 catalog services and 16,034 pay-per-use endpoints, including 3,303 Parse APIs. A personal account starts at $0 with no free credits, then funds usage through Stripe. Ordinary tools stay disabled until the user turns them on. Locus settles each call against the prepaid balance and returns the charge.
Y Combinator lists a two-person team and describes Locus as payment infrastructure for agents, with permissions, limits, and a reconcilable trail. The company started with wallet rails so an agent could spend. Pro is the catalog those agents buy from. Locus also sells other products, including Locus Founder, which is not part of this launch.
The argument is procurement: one vendor and one balance instead of a stack of API subscriptions priced for humans who buy on a monthly plan. Agents spend per task, and the cost is known only after the tools run. An enterprise path in the same docs adds server keys, markup, and end-user balances for products that pass API cost through to customers. The catalog counts, the $5 top-up, and the provider list are first-party claims and have not been independently audited.
