x402 Protocol Introduces Pay-Per-Use Model for AI Agent Compute

Coinbase Brings Flexible Pricing to x402

Coinbase has announced a major upgrade to the x402 protocol, introducing a usage-based payment model that replaces the previous fixed-fee structure for AI agent compute. The new mechanism, called Upto, is already available through the x402 SDK and CDP Facilitator tool.

«Usage-based pricing is now live on x402! The new "Upto" scheme lets agents pay only for what they consume, unlocking variable-cost services like LLM inference, compute, and data queries on x402. Available now on the x402 SDK + CDP Facilitator.» — Coinbase Developer Platform🛡️ (@CoinbaseDev), original post

The Upto mechanism grants autonomous AI systems access to variable-cost services, including large language model (LLM) inference, general compute tasks, and database queries.

Why This Matters

Before this update, x402 only supported fixed payments — a model suitable for deterministic APIs but fundamentally incompatible with services where costs depend on token volume, compute duration, or query complexity. In practice, lightweight and resource-intensive tasks cost users the same amount.

Shifting to a consumption-based model is a crucial step toward full autonomous commerce for AI agents. As these agents become more active participants in on-chain economies, the need for instant, fair micropayments grows critical. Upto directly addresses this by letting agents spend in proportion to actual resource consumption.

How the Upto Scheme Works

Service providers set a maximum rate for task execution. Users (or AI agents) approve spending within that defined limit. The system then charges exclusively for the actual computational resources consumed — if a request turns out to be simple, the final amount is significantly lower than the ceiling.

This approach eliminates overpayment and allows users to allocate a precise budget to an AI agent without guessing potential costs. Upto operates across EVM-compatible networks and supports all ERC-20 tokens. The CDP Facilitator tool handles transactions without gas fees.

Governance and Major Participants

The x402 protocol was originally built by Coinbase, but governance transitioned to the nonprofit Linux Foundation in early April. Through the x402 Foundation, technology giants including Google, Microsoft, and Amazon Web Services are contributing to the project's development.

On-Chain Activity Shows Declining Trend

Despite strong institutional interest, Dune Analytics data reveals a notable decline in on-chain activity throughout 2026. Peak usage occurred during the week of November 4–10 last year, when weekly volume hit a record 13.7 million transactions.

From there, numbers dropped sharply. By early January 2026, weekly transactions had fallen below 1 million and continued declining through the first quarter. During the last week of March, just 112,708 transfers were processed via x402.

The second version of the x402 protocol launched in December last year. The Upto update aims to reinvigorate the platform by offering a more attractive and equitable economic model for the expanding AI agent ecosystem.