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OpenAI

Key player

Co-authored ACP; brought agentic checkout into ChatGPT.

Protocol & Standards ACP

What OpenAI builds for agent payments

OpenAI’s Instant Checkout turns ChatGPT into a storefront: the model recommends a product, the user confirms, payment completes without leaving the chat. ACP is the open standard behind that flow so other agents and merchants can interoperate.

If you sell to consumers through AI interfaces, OpenAI + ACP is the distribution bet. If you sell API access to autonomous agents, look at x402 and paid MCP servers instead.

Open-source projects that build on OpenAI

43 repositories in this directory name OpenAI in their title, description or topics — useful if you want working code rather than documentation. The most-starred are below.

  • ClawRouter  6.7k★ · TypeScript
    The agent-native LLM router for autonomous agents. 55+ models (8 free), <1ms local routing, USDC payments on Base & Solana via x402.
  • x402-openai-python  260★ · Python
    Drop-in OpenAI Python client with transparent x402 payment support.
  • bitrouter  208★ · Rust
    The self-improving LLM router that optimize your agentic workflows with every runs, works with any harnesses, any models, any loops.
  • x402-openai-typescript  152★ · TypeScript
    Drop-in OpenAI Typescript client with transparent x402 payment support.
  • AIephant-AI-Agent-Gateway  107★ · Rust
    Alephant is an open-source AI Agent Gateway for routing, tracking, and controlling LLM usage across AI agents, members, and workflows, and for publishing agent capabilities as paid endpoints with x402 and MPP payment rails.
  • ai-mocks  52★ · Kotlin
    🤖 AI-Mocks is a Kotlin-based toolkit for mocking and testing LLM APIs with real streaming and SSE support. Simulate OpenAI, Anthropic, Gemini, Ollama, and A2A services locally for reliable integration testing.
  • codex-claude-bridge  51★ · TypeScript
    Bidirectional bridge between Claude Code and OpenAI Codex CLI. Built on Claude Code Channels. Two AI agents, one conversation, real-time web UI.
  • suede-creator-skills  39★ · Python
    25 open-source Agent Skills for Claude Code and Codex: multi-agent orchestration, A-F code review, AI evals, CI ship-gates, design, copy, SEO, iOS shipping, music rights, and consumer recovery (the Amazon negotiator that recovered $448.31).
  • darwin-agentic-cloud  34★ · Python
    Verifiable and free cloud compute for AI agents. webMCP + MCP native. Check out our sandboxed Beta + research in the README
  • magento2-agentic-commerce-module  29★ · PHP
    Agentic Commerce integration for Magento 2 / Adobe Commerce (In progress)
  • agoragentic-integrations  23★ · JavaScript
    Public adapters and discovery catalog for Triptych OS (Agent OS): agent frameworks, MCP/A2A/x402 protocols, workflows, wallets, SDKs, and examples for execute-first routing, governed handoffs, and receipt-aware agent commerce.
  • the-academy  15★ · TypeScript
    A Socratic dialogue engine for AI agents.

OpenAI vs other protocol & standards

Company Protocols HQ Founded OSS repos
OpenAI ACP San Francisco, USA 2015 0
Coinbase x402 Remote / USA 2012 1
Stripe ACP San Francisco / Dublin 2010 0
Google AP2, A2A Mountain View, USA 1998 2

Also supporting ACP: Stripe.

On mpp.best

Agentic commerce explained →ACP protocol →

Related companies

Coinbase
x402
Stripe
ACP
Google
AP2

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