--- title: "Amex ACE: protocol profile | Agent Ready Checkout" description: "American Express Agentic Commerce Experiences (ACE): American Express's developer kit for agent payments. Matrix status, facts and sources." canonical: https://agentreadycheckout.com/protocols/amex-ace site: "Agent Ready Checkout" last_updated: 2026-11-04 section: "Protocols" --- # Amex ACE: protocol profile | Agent Ready Checkout > American Express Agentic Commerce Experiences (ACE): American Express's developer kit for agent payments. Matrix status, facts and sources. Source: https://agentreadycheckout.com/protocols/amex-ace Site: Agent Ready Checkout Last reviewed: 2026-11-04 Protocol profile # American Express Agentic Commerce Experiences (ACE) In short American Express's developer kit for agent payments (agent registration, account enablement, intent, payment credentials, cart context), with Amex Agent Purchase Protection announced for agent errors. For Amex ACE, merchant of record is merchant and dispute rules are announced. Announced but not yet live: Stripe, Adyen, Crossmint, and 3 more. ## Fact sheet Type Protocol Operator American Express Homepage [americanexpress.com](https://www.americanexpress.com/en-us/company/agentic-commerce/) Matrix reach 0 live, 0 pilot, 6 announced, 0 not supported, 21 with no statement found ## Readiness for merchants Seven rows, each read from a primary source on 4 Nov 2026. The [method page](https://agentreadycheckout.com/method) defines every row. | Rubric row | Reading | Evidence | Source and read date | | --- | --- | --- | --- | | Specification public | Partial | Three of five specifications available to developers since 14 Apr 2026. | americanexpress.com, 4 Nov 2026 | | Reference implementation | No | No public reference code. | americanexpress.com, 4 Nov 2026 | | Live surfaces | None confirmed | OpenAI, Google and Microsoft are listed as supporters, with no live flow stated. | americanexpress.com, 4 Nov 2026 | | Processor support | Partial | Stripe documents possible ACE token use; Adyen names Amex a partner. | docs.stripe.com, 4 Nov 2026 | | Merchant of record | Merchant | Claims start with a return to the merchant, which remains the seller. | americanexpress.com, 4 Nov 2026 | | Dispute rules | Announced | Agent Purchase Protection announced for agent error, in addition to normal dispute rights. | americanexpress.com, 4 Nov 2026 | | Cost | Not published | No fee published. | americanexpress.com, 4 Nov 2026 | ## The row in full: every column | Column | Status | Note | Source and read date | | --- | --- | --- | --- | | Stripe | announced | SPT docs say Stripe may use American Express ACE Kit tokens on the seller's behalf; no merchant-facing control documented | docs.stripe.com, 4 Nov 2026 | | Adyen | announced | American Express named a strategic partner of Adyen Agentic; ACE not named | adyen.com, 4 Nov 2026 | | PayPal | no statement found | no statement found (2026-11-04) | developer.paypal.com, 4 Nov 2026 | | Checkout.com | no statement found | no statement found (2026-11-04) | checkout.com, 4 Nov 2026 | | Braintree | no statement found | no statement found (2026-11-04) | developer.paypal.com, 4 Nov 2026 | | Worldpay | no statement found | no statement found (2026-11-04) | worldpay.com, 4 Nov 2026 | | Coinbase | no statement found | no statement found (2026-11-04) | docs.cdp.coinbase.com, 4 Nov 2026 | | Crossmint | announced | Cointelegraph (Jun 2026) reports Crossmint working with American Express; not in Crossmint docs | cointelegraph.com, 4 Nov 2026 | | Skyfire | no statement found | no statement found (2026-11-04) | docs.skyfire.xyz, 4 Nov 2026 | | PayOS | no statement found | no statement found (2026-11-04) | payos.ai, 4 Nov 2026 | | Shopify | no statement found | no statement found (2026-11-04) | shopify.dev, 4 Nov 2026 | | BigCommerce | no statement found | no statement found (2026-11-04) | bigcommerce.com, 4 Nov 2026 | | Salesforce CC | no statement found | no statement found (2026-11-04) | salesforce.com, 4 Nov 2026 | | Adobe Commerce | no statement found | no statement found (2026-11-04) | experienceleague.adobe.com, 4 Nov 2026 | | commercetools | no statement found | no statement found (2026-11-04) | docs.commercetools.com, 4 Nov 2026 | | WooCommerce | no statement found | no statement found (2026-11-04) | woocommerce.com, 4 Nov 2026 | | Amazon | no statement found | no statement found (2026-11-04) | aboutamazon.com, 4 Nov 2026 | | Walmart | no statement found | no statement found (2026-11-04) | corporate.walmart.com, 4 Nov 2026 | | Target | no statement found | no statement found (2026-11-04) | corporate.target.com, 4 Nov 2026 | | Etsy | no statement found | no statement found (2026-11-04) | help.etsy.com, 4 Nov 2026 | | Wayfair | no statement found | no statement found (2026-11-04) | aboutwayfair.com, 4 Nov 2026 | | ChatGPT | announced | Amex lists OpenAI among companies supporting its ACE developer kit; no live ChatGPT flow stated. | americanexpress.com, 4 Nov 2026 | | Google AI Mode | announced | Amex lists Google among companies supporting its ACE developer kit; no live Google flow stated. | americanexpress.com, 4 Nov 2026 | | Perplexity | no statement found | no statement found (2026-11-04) | perplexity.ai, 4 Nov 2026 | | Amazon Rufus | no statement found | no statement found (2026-11-04) | aboutamazon.com, 4 Nov 2026 | | Meta Muse | no statement found | no statement found (2026-11-04) | about.fb.com, 4 Nov 2026 | | Copilot | announced | Amex lists Microsoft among companies supporting its ACE developer kit; no live Copilot flow stated. | americanexpress.com, 4 Nov 2026 | | | | 0 live or pilot of 27 | | | | ## What Amex ACE does not do - Does not yet register agents: Agent Registration is under development. - Does not cover subjective intent under Agent Purchase Protection. - Does not publish pricing. ## Sourced facts - Amex lists five ACE services: Identify (Agent Registration), Activate (Account Enablement), Contextualize (Intent Intelligence), Fulfill (Payment Credentials) and Enhance (Cart Context). [americanexpress.com](https://www.americanexpress.com/en-us/company/agentic-commerce/), read 4 Nov 2026. - Amex says Account Enablement, Intent Intelligence and Payment Credentials specifications are available as of 14 Apr 2026; Agent Registration and Cart Context are still under development. [americanexpress.com](https://www.americanexpress.com/en-us/company/agentic-commerce/), read 4 Nov 2026. - Amex describes Amex Agent Purchase Protection: "In the future", if a registered agent sends the Card Member's authenticated purchase intent, Amex will protect eligible customers from charges caused by agent error. [americanexpress.com](https://www.americanexpress.com/en-us/company/agentic-commerce/), read 4 Nov 2026. - Eligible agent errors are purchases that deviate from the authenticated intent; claims follow a return attempt with the merchant and exclude subjective intent such as "best" or "really nice". [americanexpress.com](https://www.americanexpress.com/en-us/company/agentic-commerce/), read 4 Nov 2026. - Companies listed as supporting ACE include Adyen, Cloudflare, Crossmint, Delta, Expedia Group, Fiserv, Forter, Global Payments, Google, Microsoft, Nekuda, OpenAI, PayPal, Stripe and VGS. [americanexpress.com](https://www.americanexpress.com/en-us/company/agentic-commerce/), read 4 Nov 2026. - Stripe says it might use American Express ACE Kit tokens on the seller's behalf when processing Shared Payment Tokens. [docs.stripe.com](https://docs.stripe.com/agentic-commerce/concepts/shared-payment-tokens.md?agent-seller=seller), read 4 Nov 2026. - American Express is a premier member of the x402 Foundation (operational launch 14 Jul 2026). [x402.org](https://x402.org/linux-foundation-announces-operational-launch-of-x402-foundation-to-standardize-internet-native-payments-for-ai-agents-and-applications/), read 4 Nov 2026. ## In the vendors section - [American Express](https://agentreadycheckout.com/vendors/american-express), card network profile ## Compare and alternatives - [Amex ACE vs Mastercard Agent Pay](https://agentreadycheckout.com/compare/amex-ace-vs-mastercard-agent-pay) ## Sources 1. [Amex Agentic Commerce Experiences](https://www.americanexpress.com/en-us/company/agentic-commerce/), read 4 Nov 2026 2. [docs.stripe.com/agentic-commerce/concepts/shared-payment-tokens.md](https://docs.stripe.com/agentic-commerce/concepts/shared-payment-tokens.md?agent-seller=seller), read 4 Nov 2026 3. [x402 Foundation operational launch](https://x402.org/linux-foundation-announces-operational-launch-of-x402-foundation-to-standardize-internet-native-payments-for-ai-agents-and-applications/), read 4 Nov 2026 4. [adyen.com/press-and-media/adyen-agentic](https://www.adyen.com/press-and-media/adyen-agentic), read 4 Nov 2026 5. [cointelegraph.com/news/crossmint-enables-visa-card-payments-for-ai-agents-and-autonomous-commerce](https://cointelegraph.com/news/crossmint-enables-visa-card-payments-for-ai-agents-and-autonomous-commerce), read 4 Nov 2026 Last reviewed 4 Nov 2026 ## Edition Matrix edition of 4 Nov 2026. Reviewed 4 Nov 2026, [5 sources](#sources-h). ## Method [How cells, sources and read dates are defined](https://agentreadycheckout.com/method)