novuhq/novu
Novu is an open-source communication infrastructure that unifies notification delivery across various channels for both products and AI agents, offering a single API for multi-channel messaging, wo...
Awesome AI Agents › Communication Protocols
google-agentic-commerce/a2a-x402
The A2A x402 Extension defines how agents speaking the Agent-to-Agent protocol can charge each other for services and settle those charges on-chain, reviving the HTTP 402 Payment Required status code for agent-to-agent commerce. It is published by Google's agentic commerce group and consists of a versioned specification, core libraries in more than one language, and runnable example agents. The payment flow has three steps. A merchant agent that requires payment for a capability answers a request with a payment-required message describing what is owed. The client agent signs the payment details and returns them in a payment-submitted message. The merchant verifies the signature, settles the payment on-chain, and replies with a payment-completed message that carries the delivered result. Because the exchange is expressed entirely as A2A messages, the same flow can be implemented in any language, and the repository keeps the specification separate from the implementations so partners can add their own. A schemes directory holds experimental payment schemes drafted by contributors outside the core team. The libraries follow a functional core with an imperative shell: a protocol layer supplies the data structures and the functions that create, sign and verify payments, and an executor layer provides middleware that drives the whole handshake automatically, so an existing agent can gain payment support without its author writing the state machine by hand. Developers who need unusual behaviour can drop to the protocol layer instead. The extension builds on the underlying x402 payment protocol and sits alongside the Agent Payments Protocol from the same organisation. The intended audience is developers who expose an agent as a paid service, for API calls, data processing, model inference or any other billable capability, and those building client agents that must pay for such services.
https://github.com/google-agentic-commerce/a2a-x402
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