x402 Protocol
Overview
Open payment protocol that lets AI agents and APIs send instant stablecoin micropayments over HTTP using the 402 status code.
x402 is an open, internet-native payment protocol that activates the long-reserved HTTP 402 “Payment Required” status code to handle payments directly inside web and API requests. It allows AI agents, apps, and APIs to charge and pay per request using stablecoins like USDC, removing the need for traditional API keys, subscriptions, or manual billing. Built as an open standard by Coinbase and deployed on chains such as Solana and Base, x402 supports low-cost, high-throughput micropayments suitable for agentic workflows, data APIs, model inference, and digital content. By embedding pricing, payment instructions, and proof of payment in normal HTTP flows, x402 enables fully autonomous, machine-to-machine commerce and a more granular, usage-based business model for online services.
AI Agent Store research
What the evidence says about x402 Protocol
x402 Protocol is best understood as agent-adjacent payment, market, or financial infrastructure. The checked public page supports a focused description: open payment protocol that lets AI agents and APIs send instant stablecoin micropayments over HTTP using the 402 status code.
Last reviewed July 30, 2026
Verified capabilities
- Agent-adjacent financial tooling
Open payment protocol that lets AI agents and APIs send instant stablecoin micropayments over HTTP using the 402 status code.[1]
Where it fits best
- Monetizing APIs, AI models, and data services with pay-per-request or usage-based pricing instead of subscriptions.[1]
Sources and research method (1)
We record only claims tied to public sources checked by our team or listing workflow. Counts above are derived directly from this profile, not a subjective rating.
- x402Official site · checked 2026-07-30
Autonomy level
44%
Comparisons
Custom Comparisons
Some of the use cases of x402 Protocol:
- Monetizing APIs, AI models, and data services with pay-per-request or usage-based pricing instead of subscriptions.
- Enabling AI agents to autonomously pay for API calls, data, and compute using stablecoins over HTTP.
- Adding micropayments to web content such as articles, datasets, or tools without user accounts or OAuth flows.
- Building machine-to-machine payment flows for IoT devices, bots, and autonomous services.
- Experimenting with new pricing models like fine-grained metering and dynamic pay-per-use for digital services.
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Popularity level: 89%
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