x402
Open payment protocol enabling agents and apps to pay for APIs over HTTP using stablecoins.
Last release Apr 13, 2026 · Last commit Jun 25, 2026 · ★ 103
Overview
x402, introduced by Coinbase, revives the HTTP 402 'Payment Required' status code as an open protocol for machine-native payments. It lets AI agents pay per-request for APIs and services using stablecoins like USDC, a key building block for agents that autonomously buy the resources they need.
Sato Score
83/100· HighHow open, active & verifiable — not a safety or returns grade.
- Maintenance & liveness
- 35/35
- Code transparency
- 19/20
- Interface verifiability
- 8/10
- Docs & demo
- 6/10
- Listing transparency & provenance
- 15/15
- Independent verification
- 0/10
Deploy path reproduced — install verified in an isolated container (proves installability, not runtime safety).
Details
- Chains
- Base, Ethereum, Multichain, Solana
- Agent types
- Protocol, Payments, Standard
- Open source
- Yes
- Pricing
- Free / open protocol
- Last checked
- 2026-07-25
Marketplace Signals
No marketplace signals recorded for this resource yet.
Verification status reflects evidence reviewed by Sato Hub. Self-reported claims are never presented as verified.
Recent Activity
All news →Releases and posts from x402, pulled from its GitHub and X.
Listing History
Recorded changes to x402's listing — status, verification, Sato Score, and recent releases. Full history is kept in the listing record.
- Jul 19, 2026Verified: deploy spec
- Jul 3, 2026Crossed 100 GitHub stars95 → 103.
- Jun 25, 2026Enriched: creator name, chains supported, tags, marketplace notes
- Jun 25, 2026Auto-enriched: creator profile url, agent type, deployment options, supported integrations
- Jun 11, 2026Sato Hub began tracking this listing
Related Resources
ERC-8004: Trustless Agents
ActiveEthereum standard providing on-chain identity, reputation, and validation registries for AI agents.
Agent Payments Protocol (AP2)
ActiveOpen protocol from Google for secure agent-led payments across traditional and crypto rails, with a crypto-native x402 extension built with Coinbase, Ethereum Foundation, and MetaMask.
Privy
ActiveEmbedded and server wallet infrastructure used to give agents secure key management.
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