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A seller is an entity that wants to monetize APIs, content, prompts, data, or agents. x402 brings programmable payments from their customers (buyers) with minimal setup.

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Benefits for the Buyer

  • Ability to sell per-use or per-unit of service
  • Ability to accept micropayments
  • Ability to build for AI Agents and Prompting Tools
  • Ability to delegate the blockchain complexity to a facilitator
  • x402 can complement existing payment systems or serve as a standalone option

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Transaction Fees

x402 utilizes EIP-3009, a gasless meta transaction protocol, that allows sellers to authorize the movement of some amount of funds without the need to have or pay for gas. Some facilitators may charge a small fee for the use of their services, but this is typically a small percentage of the transaction amount and should be transparent to the seller up-front.