x402
Open payment standard that uses the HTTP 402 status code so clients, including agents, can pay per request.
Reference by Started at Coinbase; now stewarded by the x402 Foundation
About
Use cases: payments-billing
Reviews
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About the protocol
- Specification
- github.com/x402-foundation/x402
- Maintainer
- Started at Coinbase; now stewarded by the x402 Foundationx402.org
- Governance
- x402 Foundation under the Linux Foundation (operational launch 2026-07-14)x402.org
- x402 Foundation premier members include AWS, Cloudflare, Coinbase, Google, Stripe, Visa and Mastercard. x402.org
Listings that use it
10 visible listings declare x402: 6 identity, auth & payments, 4 agent infrastructure.
Identity, auth & payments
- 0.685score
Coinbase x402 Facilitator
Coinbase
Open payment standard that turns API endpoints into paid resources, settled by the CDP facilitator
Identity toolAFreshness: A★ 172payments - 0.595score
Crossmint
Crossmint
Wallets, virtual cards and stablecoin infrastructure that let AI agents hold money and pay for services
Identity toolAFreshness: Apayments - 0.584score
PayAI Facilitator
PayAI
x402 facilitator that verifies and settles stablecoin payments for AI agents and apps on Solana and EVM networks
Identity toolAFreshness: Apayments - 0.581score
Kite
Kite AI
Agent Passport gives AI agents a funded wallet and user-set spending limits, with verifiable receipts
Identity toolAFreshness: Apayments - 0.580score
World AgentKit
Tools for Humanity
Extension of x402 that lets websites tell human-backed AI agents apart from bots and scripts
Identity toolAFreshness: Aidentity - 0.579score
thirdweb x402
thirdweb
Client and server stack for x402 payments on 170+ EVM chains, with React hooks and a facilitator
Identity toolAFreshness: Apayments
Agent infrastructure
- 0.753score
Cloudflare Agents
Cloudflare
Durable runtime for building and hosting AI agents on Cloudflare's global network.
InfrastructureAFreshness: A★ 5.9Khosting - 0.600score
Linkup
Linkup
Web search API for AI applications, available through one API call or deployed inside your own cloud.
InfrastructureAFreshness: Asearch - 0.597score
Apify
Apify
Marketplace of ready-to-run web scraping and automation tools called Actors, runnable through an API.
InfrastructureAFreshness: Ascraping - 0.592score
Zyte API
Zyte
Web scraping API with automatic ban handling, browser rendering, sessions and extraction, plus a Python client.
InfrastructureAFreshness: Ascraping
Signals
- Stars
- 6,758
- Forks
- 2,222
- Open issues
- 377
- Last commit
- Oct 24, 2026 (4 days ago)
From GitHub (fetched Oct 24, 2026).
Details
- License
- Apache-2.0
- Repository
- github.com/x402-foundation/x402
- Website
- x402.org/
- First seen
- Oct 24, 2026
- Last checked
- Oct 24, 2026
Same server elsewhere
Copies of this server published by others; search shows only one of them.
Cite this page
x402. Agent Mart. https://agentmart.dev/reference/x402 (last updated 2026-10-24)