- Agentic commerce
- Buying and selling where an AI agent does the searching, ordering and paying for a person or business.
- Agentic payments
- The payment step of agentic commerce: an agent moving money with a card, a wallet or a bank account it has been allowed to use.
- AI agent
- Software built on a language model that can take actions, such as calling an API or filling a cart, toward a goal someone gave it.
- Agent wallet
- A wallet an agent can spend from, usually holding stablecoins, with keys often held by a provider and limits set by the owner.
- Agentic token
- A card network token issued for one agent, so the agent can pay without ever holding the real card number (Mastercard's term).
- Network token
- A stand-in for a card number issued by a card network such as Visa or Mastercard. If it leaks, it can be cancelled without replacing the card.
- Shared Payment Token
- Stripe's token that lets an agent pass a buyer's payment method to one seller, with spending and expiry limits, without exposing card details.
- Mandate
- A signed record of what a user allowed an agent to do. AP2 uses an Intent Mandate for the rules and a Cart Mandate for the final basket.
- Intent Mandate
- The AP2 record of a user's request and limits, such as a price cap or a time window, signed before the agent shops.
- Cart Mandate
- The AP2 record signed when the user approves the exact items and price, which the merchant can check later.
- Verifiable credential
- A digitally signed statement that anyone can check without calling the issuer. AP2 mandates use them.
- HTTP 402
- The 'Payment Required' status code, reserved in the web standard since the 1990s and now used by x402 to ask for payment.
- x402
- An open standard where a server replies to an unpaid request with HTTP 402 and the client pays in stablecoins to get the response.
- Facilitator
- A service that checks and settles x402 payments onchain for a seller, so the seller's server doesn't need to run that logic.
- Pay per call
- Charging an agent for each API request or piece of content, sometimes a fraction of a cent, instead of a monthly plan.
- Session (MPP)
- In the Machine Payments Protocol, a one-time approval with limits that lets an agent make many payments that settle together.
- Stablecoin
- A token that tracks a currency, usually the US dollar. The most common kind is backed by cash and short-term government debt. USDC is common in agent payment tools such as x402.
- Know your agent (KYA)
- Checks that confirm which agent is acting and for whom, the agent version of know your customer.
- Web Bot Auth
- A draft web standard, first proposed by Cloudflare and now at the IETF, for a bot to sign its requests so a website can verify which agent is visiting.
- Agent registration
- Enrolling an agent with a card network or issuer before it can pay, as Mastercard Agent Pay requires.
- Merchant of record
- The business legally selling the item, which takes the payment and handles refunds and chargebacks. In agent checkout the merchant usually stays in this role.
- Chargeback
- A card payment reversed through the network after a dispute. Most stablecoin payments have no built-in chargeback.
- Virtual card
- A card number with no plastic, often created for one purchase or one agent with its own limit.
- Prefunding
- Putting money in place before it is spent, for example topping up a card program at the issuer or a wallet the agent pays from.
- Spending limit
- A cap on what an agent can spend per payment, per day or per merchant, set by the owner and enforced by the wallet or card.
- MCP (Model Context Protocol)
- An open standard, created by Anthropic and now run under the Linux Foundation, for connecting AI models to tools and data. Many payment providers ship MCP servers for agents.
- A2A (Agent2Agent)
- An open protocol, created by Google and now run under the Linux Foundation, for agents from different vendors to talk to each other. AP2 works as an extension of it.
- Agentic checkout
- A checkout flow built for an agent instead of a person clicking through a web page, usually over an API such as ACP or UCP.