How to accept payments from AI agents

Short answer: there are four practical paths, and they are not mutually exclusive. ACP (OpenAI + Stripe) currently carries product discovery in ChatGPT: merchants publish eligible product feeds and promotions, then keep checkout on their own site or use a ChatGPT app. UCP (Google + Shopify) was announced for an agentic checkout rollout on Google AI Mode and the Gemini app, with the retailer remaining seller of record. AP2 (Google) is a payment-agnostic framework for authorizing agent-led payments across cards, stablecoins and bank transfers. x402 accepts stablecoins natively over HTTP through a facilitator. Pick by surface and documented capability, then confirm the live integration terms before building.

Path 1: ACP, product discovery in ChatGPT

The Agentic Commerce Protocol powered the original Instant Checkout flow in ChatGPT. On 24 March 2026 OpenAI announced a focus on product discovery and merchant checkout. OpenAI now documents ACP for product discovery: merchants share product feeds and promotions so that ChatGPT can represent their catalogue. The shopper then completes checkout on the merchant side or inside a ChatGPT app. Keep titles, descriptions, images, price and availability current, because these are the public inputs on which discovery depends. See what happened to Instant Checkout and the ACP standard page.

Path 2: UCP, sell on Google AI Mode and Gemini

The Universal Commerce Protocol, launched by Google on 11 January 2026 and co-developed with Shopify, Etsy, Wayfair, Target and Walmart, standardizes the full shopping journey: discovery, checkout and post-purchase support. Google announced that it would soon power checkout on eligible product listings in AI Mode and the Gemini app, with Google Pay for the initial rollout and PayPal as a future option; the retailer remains the seller of record. Capabilities are served over REST APIs, MCP or A2A. See the UCP standard page.

Path 3: AP2, authorize agent-led payments

Google’s Agent Payments Protocol is payment-agnostic and designed as an extension of the A2A protocol and MCP, developed with 60+ organizations including Mastercard, PayPal and American Express. It captures user intent through verifiable credentials (mandates) and spans cards, stablecoins and real-time bank transfers. See the AP2 standard page.

Path 4: x402, native stablecoin payments

x402 revives the HTTP 402 status code: your server responds with payment requirements, the agent submits a signed payment, and a facilitator settles on-chain. The exact scheme uses EIP-712 and EIP-3009 on EVM networks and TransferChecked on Solana. It suits pay-per-call APIs and machine-to-machine commerce. See the x402 standard page.

Accepting payment is only half the loop. Before an agent can buy, it has to discover and correctly read your products — a separate, machine-readable problem the payment standards do not solve. See how AI agents find and read your products to make your catalogue agent-ready.

Compare all five standards →

Frequently asked questions

How does a merchant accept payments from AI agents?

By making checkout and product data agent-ready: use ACP for the current ChatGPT product-discovery path, UCP where Google agentic checkout applies, and AP2 or x402 where their authorization or payment rails fit the use case. Confirm each platform’s current integration terms before implementation.

Do I need to change my payment processor?

Not necessarily. The retired Instant Checkout documentation described the merchant as merchant of record and Stripe Shared Payment Tokens. The current ChatGPT product-discovery path keeps checkout on the merchant side or in a ChatGPT app, so the required integration depends on the merchant’s chosen surface.

What do I need to sell through ChatGPT?

Since 24 March 2026 the entry point is product discovery, not the old Instant Checkout flow. Adopt the Agentic Commerce Protocol to share feeds and promotions, directly or through a provider such as Salesforce or Stripe, and keep your product data current (titles, descriptions, images, price, availability). Checkout happens on your side, or inside a ChatGPT app if you build one. See the OpenAI and Stripe docs linked below; the exact feed cadence should be confirmed against the official documentation.

How do AI agents pay with stablecoins?

Via x402: the server returns an HTTP 402 with payment requirements, the agent submits a signed payment, and a facilitator settles on-chain (e.g. USDC). AP2 also covers crypto through the A2A x402 extension.