Extension Systems • Estimated 35m

L402 Lightning HTTP Payments

extension.l402

L402 combines an HTTP 402 challenge, a Lightning invoice, and a macaroon-based access token so a client can pay for an online resource and retry with cryptographic proof of payment. It enables metered APIs and machine-to-machine access without requiring a conventional account or credit-card session.

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Curated resources (3)

• L402 Protocol Specification (article) Official request, challenge, payment, and authenticated-retry flow, including token and preimage handling.
• Lightning Labs L402 Repository (tool) Reference libraries and examples for adding L402 payment authentication to clients and servers.
• Freedom Skills: L402 API Reference (article) Practical guide to the L402 challenge-response flow and common security checks when integrating a paid API.

Direct prerequisites (1)

• Invoices and Payment Requests

Direct dependents (0)

• None

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