Summary
A race is underway to define the rails for AI-agent payments. Stripe co-built the Agentic Commerce Protocol (ACP) with OpenAI, powering Instant Checkout inside ChatGPT, and is building Tempo (a payments-first blockchain) and the Machine Payments Protocol. Google launched its Agent Payments Protocol (AP2) in September 2025 with 60+ partners including Mastercard, PayPal, Coinbase and Amex. Visa has its Trusted Agent Protocol and Mastercard has Agent Pay. The core problem all are solving: how a merchant can tell the difference between a useful agent acting for a real customer and a bot trying to scrape, spam or commit fraud.
Key Points
- Stripe's ACP (with OpenAI) powers Instant Checkout in ChatGPT; 1M+ Shopify merchants lined up
- Merchants can enable agentic payments by changing as little as one line of code
- Stripe building Tempo (payments-first blockchain with Paradigm) and Machine Payments Protocol
- Link's wallet for agents: one-time-use card or shared payment token
- Stripe preparing stablecoin-backed cards in 60 countries and stablecoin-backed financial accounts in 150 countries
- Google's AP2 (Sept 2025): 60+ partners; uses signed mandates for intent, cart and payment
- FIDO Alliance: Google contributed AP2 as foundation for agentic standards work
- Visa's Trusted Agent Protocol; Mastercard's Agent Pay
- Agentic Payments Alliance (APA) formed Aug 2026: Visa, Mastercard, Fiserv, Circle, Solana, Remitly, ~24 members
- Coinbase's x402: 165M+ payments totaling $50M; ~99% USDC; avg transaction ~30 cents
- McKinsey projects $3-5 trillion in global agentic commerce by 2030
- Trust, authorization and fraud liability remain unresolved