awesome-agentic-payments
A curated list of protocols, specs, SDKs, and tools powering the emerging agentic commerce stack.
https://github.com/bitrefill/awesome-agentic-payments
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Commerce protocols
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ACP (Agentic Commerce Protocol)
- ACP GitHub Repository - Specification and implementation (Apache 2.0).
- Stripe ACP Integration - Stripe's integration guide.
- Stripe Blog: Developing an Open Standard - Technical overview and rationale.
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AP2 (Agent Payments Protocol)
- AP2 Official Site - Primary documentation.
- AP2 Specification - V0.1 technical spec.
- AP2 GitHub Repository - Reference implementation and code samples.
- Google Cloud AP2 Announcement - Official announcement.
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MPP (Machine Payments Protocol)
- MPP Official Site - Primary documentation portal.
- MPP Specification GitHub Repository - Specifications for the Machine Payments Protocol.
- MPP-enabled Services Directory - Proxy endpoints supporting MPP-over-Tempo payment for various data services.
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UCP (Universal Commerce Protocol)
- UCP Official Site - Primary documentation portal.
- UCP GitHub Repository - Specification and documentation.
- UCP Code Samples - Reference implementations.
- UCP Google Developers Guide - Google's official UCP docs.
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Crypto payment rails
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Fewsats
- Fewsats MCP Server - MCP server for AI agent payments.
- Fewsats Python SDK - L402 payments for AI agents.
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L402
- L402 Builder's Guide - Full documentation.
- L402 Protocol Specification - Full technical spec.
- L402 GitHub Repository - Protocol specification source.
- Aperture - Production L402 reverse proxy for REST and gRPC APIs.
- L402 standardization (bLIP-0026) - Proposed Lightning spec for the HTTP-402 flow, underpinned by BOLT 11 invoices and LNURL-auth.
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x402
- x402 Official Site - Documentation and ecosystem overview.
- x402 GitHub Repository - Protocol spec, SDKs, and examples.
- x402 Specification - Full technical specification.
- x402 Coinbase Documentation - Developer docs and quickstart.
- x402 on Solana - Solana integration guide.
- x402 Foundation - Neutral governance of the standard under the Linux Foundation, with 22 supporting organizations. [Foundation page](https://linuxfoundation.org/x402foundation/).
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Ecosystem
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Bitrefill
- eCommerce MCP Server - MCP server documentation.
- Bitrefill Agents - Agent skills for shopping on Bitrefill (bitrefill-website, bitrefill-cli).
- Bitrefill CLI - Command-line client. Browse, buy, and manage gift cards, top-ups, and eSIMs.
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OpenAI
- ChatGPT Merchant Program - Apply for Instant Checkout access and build a ChatGPT merchant app.
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Shopify
- Shopify Agent Commerce - Developer documentation hub.
- Shopify Storefront MCP Server - MCP server for product discovery and checkout.
- Shop Chat Agent - Reference app for conversational commerce.
- Shopify Storefront MCP Server - MCP server for product discovery and checkout.
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Fiat payment rails
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Cloudflare
- Cloudflare Agents SDK - Full SDK documentation.
- Cloudflare x402 Integration - x402 in the Agents SDK.
- Cloudflare Secure Agentic Commerce - Visa and Mastercard protocol support announcement.
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Mastercard
- Mastercard Agent Pay - Developer documentation.
- Mastercard Agent Pay - Developer documentation.
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PayPal
- PayPal Agentic Commerce Overview - Official documentation.
- Agent Ready - ACP-based agent payments for existing merchants.
- PayPal Agent Toolkit - Integrate with PayPal APIs via function calling (OpenAI Agent SDK, LangChain, Vercel AI SDK, MCP). Invoices, orders, catalog, subscriptions, disputes, shipment tracking. ([npm](https://www.npmjs.com/package/@paypal/agent-toolkit))
- Store Sync - Product catalog and cart integration for AI discovery and checkout.
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Stripe
- Stripe Agentic Commerce Docs - Primary documentation hub.
- Shared Payment Tokens (SPTs) - Scoped, single-use payment credentials for agents.
- MPP Machine-to-Machine Payments - Private preview documentation page.
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Visa
- Visa Intelligent Commerce - Developer program opening Visa rails to AI agents.
- Trusted Agent Protocol (TAP) - Authentication framework for agent-to-network communication.
- TAP GitHub Repository - Reference implementation and spec.
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Further reading
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Bitrefill
- MCP, A2A, ACP, ANP Survey Paper - Academic comparison of all major agent protocols.
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Protocol proposals and standards
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Cross-chain and standards bodies
- IETF Web Bot Auth Working Group - Draft. The standards body for authenticating bots and agents on the web, built on HTTP Message Signatures; Visa TAP and Mastercard Agent Pay align here.
- FIDO Alliance: Agentic AI - Forming. Agentic Authentication and Payments Technical Working Groups (chaired by Mastercard and Visa); Google AP2 v0.2 was donated here for standardization.
- W3C Agent Identity Registry Protocol CG - Forming (2026). Open specs for verifiable agent identity: a DID method, Verifiable-Credential agent credentials, and trust negotiation. [Spec](https://github.com/AgentIdentityRegistry/agent-identity-registry/blob/main/docs/SPECIFICATION.md).
- IETF draft: OpenID Agent Identity Claims - Draft. OpenID Connect claims for autonomous agents (agent id, owner, capabilities, spend limit).
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Ethereum
- ERC-7710 + ERC-7715: Permissions and Session Keys - Draft. Spending-policy and session-key ERCs; ERC-7710 explicitly targets bounded permissions for AI agents. See also [ERC-7715](https://github.com/ethereum/ERCs/blob/master/ERCS/erc-7715.md).
- ERC-8004: Trustless Agents - Draft. On-chain registration of AI agent identity and reputation; interoperates with Solana's Agent Registry. Hub: [8004.org](https://8004.org).
- ERC-8126: AI Agent Verification - Draft. A risk-scoring and verification layer for registered agents.
- ERC-8196: AI Agent Authenticated Wallet - Draft. Policy-bound transaction execution and verifiable credential delegation for autonomous agents; builds on ERC-8004 and ERC-8126. Discussion: [Fellowship of Ethereum Magicians](https://ethereum-magicians.org/t/erc-8196-ai-agent-authenticated-wallet/27987).
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Solana
- Solana Foundation MPP SDK - Live. The Solana Foundation's multi-language SDK implementing [MPP](#mpp-machine-payments-protocol) (plus x402 and AP2), including a Solana charge-intent payment method ([draft-solana-charge-00](https://paymentauth.org/draft-solana-charge-00)).
- Solana `pay` CLI and Skills - Live. An agent CLI that auto-resolves x402 and MPP 402 challenges for Claude and Codex sessions, with a [paid-API skills catalog](https://github.com/solana-foundation/pay-skills).
- Solana Agent Registry - Live. An on-chain protocol for verifiable agent identity, portable reputation, and validation attestations; interoperable with ERC-8004.
- Solana Agent Skills - Live. Foundation-maintained `SKILL.md` skills for agents building on Solana, including a Payments and Commerce skill.
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