x402 enables agent-to-agent billing
x402—the internet-native payment spec for AI agents—went live with a new 'Upto' usage-based pricing scheme so agents can pay only for what they consume, unlocking variable-cost commerce like LLM inference without fixed keys or billing accounts. Coinbase Developer Platform announced the feature and Venice AI demonstrated agent payments over USDC on Base, while protocol voices called it a big unlock for data agents already seeing usage. That changes how autonomous agents can transact for compute and data, letting payments be metered instead of pre-billed. (x.com/CoinbaseDev/status/2042274082151072234) (x.com/AskVenice/status/2042317021463892069) (x.com/i/status/2042285350911893505)
Coinbase Developer Platform announced that x402 went live with a new "Upto" usage-based pricing scheme so autonomous agents can pay only for the compute and data they actually consume. (x.com) (cointelegraph.com) x402 is an HTTP-native payment specification that reuses the long-unused HTTP 402 "Payment Required" status to let software agents pay for services in USD Coin (USDC) without API keys, subscriptions, or human billing accounts. (docs.cdp.coinbase.com) The "Upto" scheme, defined in the x402 repository, lets a server present a maximum charge and then measure actual usage to settle a final amount; the spec explicitly lists usage signals such as token count, compute time, and query complexity. (github.com) Venice AI posted a live demo of an agent paying for model inference in USD Coin on Base mainnet using x402, showing an agent making on-chain settlement for API calls. (x.com) (basechain.news) Before Upto, x402 only supported exact, fixed-price payments for deterministic APIs, which developers said prevented selling variable-cost services like large language model inference that charge by tokens or CPU time. (cointelegraph.com) With Upto, an autonomous agent can request a large language model call, have the provider meter token usage or runtime, and have the provider settle the final USD Coin amount on-chain instead of requiring a prepaid API key or subscription. (x402.org) Coinbase's docs and the GitHub scheme show the Upto flow implemented for the Ethereum Virtual Machine (EVM), interoperable with the ERC-20 token standard, and designed to work with Permit2-style gasless approvals and a Coinbase facilitator that can sponsor gas or handle settlement. (docs.cdp.coinbase.com)
