# x402

An open payment standard built on HTTP's 402 Payment Required: the server answers a request with what it costs, and the agent pays and sends the request again.

Source: https://agentdrives.com/glossary/x402 · as data: https://agentdrives.com/glossary/x402.json · licence CC BY 4.0

## In our drives

Each drive records whether the product takes x402 payments. Where it does, our agent may make one small payment there.

Agent payments in our data: https://agentdrives.com/data/payments?via=md

From the source: “The PAYMENT-REQUIRED header is the canonical HTTP transport location for the PaymentRequired object.” (x402 specification, checked 3 Oct 2026: https://raw.githubusercontent.com/x402-foundation/x402/main/specs/transports-v2/http.md)

## Products that offer x402 payments

10 of the 151 products we drove.

- [AgentMail](https://agentdrives.com/tools/agentmail.md?via=md): L4 Runs on its own
- [Parallel](https://agentdrives.com/tools/parallel.md?via=md): L4 Runs on its own
- [Stripe](https://agentdrives.com/tools/stripe.md?via=md): L3 Does the work
- [Tavily](https://agentdrives.com/tools/tavily.md?via=md): L3 Does the work
- [Browserbase](https://agentdrives.com/tools/browserbase.md?via=md): L2 Gets in
- [Exa](https://agentdrives.com/tools/exa.md?via=md): L2 Gets in
- [Steel](https://agentdrives.com/tools/steel.md?via=md): L2 Gets in
- [Apify](https://agentdrives.com/tools/apify.md?via=md): L1 Needs a person

## Related terms

- [MPP](https://agentdrives.com/glossary/mpp.md): The Machine Payments Protocol: a way for a server to ask for payment over HTTP, so an agent can pay for a call or a plan without a checkout page.
- [Agentic commerce](https://agentdrives.com/glossary/agentic-commerce.md): AI agents buying for people and companies: finding the price, paying and getting what was paid for, with no person at the checkout.
- [Agents as customers](https://agentdrives.com/glossary/agents-as-customers.md): AI agents that choose, sign up for and pay for software on behalf of the people and companies they work for. A product that keeps them out loses those sales.

Every term: https://agentdrives.com/glossary.md