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Frequently Asked Questions
General
What is x402 in a single sentence?
Is x402 a proprietary product?
Why not use traditional payment rails or API keys?
Is x402 only for crypto‑native projects?
Language & Framework Support
What languages and frameworks are supported?
Facilitators
Who runs facilitators today?
What stops a malicious facilitator from stealing funds?
Pricing & Schemes
How should I price my endpoint?
Can I integrate x402 with a usage manager?
Assets, Networks & Fees
Which assets and networks are supported today?
Does x402 support fiat off‑ramps?
Security
Do I have to expose my private key to my backend?
How do refunds work?
Usage by AI Agents
How does an agent know what to pay?
Do agents need wallets?
Governance & Roadmap
Is there a formal spec or whitepaper?
How will x402 evolve?
Troubleshooting
I keep getting 402 Payment Required, even after attaching X‑PAYMENT. Why?
My test works on Testnet but fails on Mainnet—what changed?
Still have questions?
Open a GitHub Issue
