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Integrations
A curated list of protocols, specs, SDKs, and tools powering the emerging agentic commerce stack.
How the pieces fit together
The architecture of the Agentic Payments ecosystem
USER / AI AGENTClaude Code · OpenAI Agents · Google ADK
Skills, Plugins, Function Calling
CONTEXT & TOOLS (MCP)MCP Servers · MCP Registry · MCP Apps (UI)
AGENT COMMUNICATIONA2A (Agent2Agent) · ANP (Agent Network Protocol)
COMMERCE PROTOCOLSACP (OpenAI+Stripe) · AP2 (Google) · UCP (Google+Shopify)
PAYMENT RAILSCrypto (x402, L402) · Fiat (Stripe, Visa, Mastercard)
ECOSYSTEMOpenAI · Shopify · Bitrefill
Context & Tools
MCP StandardOpen standard connecting AI models to data.
MCP ServersReference implementations (SQLite, Postgres).
SmitheryThe registry for MCP servers.
Agent Comm.
Agent2Agent (A2A)Secure multi-agent delegation.
Agent Network ProtocolOpen-source standard for interoperability.
Commerce Protocols
ACP (Agentic Commerce)Stripe and OpenAI intent passing.
Agent Payment ProtocolGoogle's headless MCP interactions.
Universal CommerceGoogle & Shopify evolving standard.
Payment Rails (Fiat)
StripeSPTs & Agent Toolkit via MCP.
VisaTokenized Asset Payments (TAP).
MastercardAgent Pay & Dynamic Tokenization.
PayPalAgent Ready platform & Store Sync.
Payment Rails (Crypto)
x402 (Stablecoins)Status code 402 via USDC/USDT.
L402 (Lightning)Bitcoin Lightning & Macaroons.
FewsatsL402 toolkit for agents.
Cloudflare AgentsNatively supports x402.
Ecosystem
OpenAIChatGPT Instant Checkout.
ShopifyStorefront MCP Server.
BitrefilleCommerce MCP server & Agent CLI.