billing

Wattfare is an OAuth-style way for apps to let users connect and fund their own AI usage with a monthly cap. It offers an SDK, OpenAI-compatible model access, and support for Vercel AI SDK workflows.

Blocks.ai is an infrastructure and network layer for AI agents, offering outbound-only connectivity, routing, auth, billing, streaming, and a marketplace/network for builders and callers.

An open-source Stripe-like payment layer for AI agents and paid MCP tools, with spend authorization, per-call charging, and settlement flows for test credits in beta.

Paid public API for finance built on the Neurobro agent. The docs show API key authentication, a single ask endpoint, tier-based modes, billing, rate limits, errors, examples, and a quickstart.