2026-04-02 Introducing the L402 Launch Checker
Building with Lightning payments? The hardest part isn't the payment flow—it's knowing whether your API is actually ready to speak L402.
Today we're launching the L402 Launch Checker: a simple tool that probes your endpoint and tells you whether it's configured to accept Lightning payments via the L402 protocol.
How It Works
Enter your API endpoint. Get an immediate classification:
- Supported — Your endpoint shows clear L402 behavior
- Unsupported — No L402 signals detected
- Unclear — The probe couldn't confirm either way
Run a free preflight check in under 5 seconds. If you want the full picture, run a detailed scan after payment to get invoice parsing, payment verification, a complete transcript, and a prioritized fix list.
## What We Built
The L402 Launch Checker is a narrow, automated tool for developers who want to verify their L402 integration before going live. It's self-serve, fully automated, and has a fixed per-scan cost capped at an amount you choose.
No consulting. No custom implementation. Just a clear answer about whether your API is L402-ready.
## Why We Built It
The L402 protocol is powerful but the integration surface is nuanced. A single misconfigured header or non-standard field name can break clients silently. We've seen developers spend days debugging issues that a structured probe would have caught in seconds.
This tool exists to give you confidence in your L402 integration before your users hit it.
## Try It
Run a free preflight check at maximumsats.com/l402-launch-checker.
If you want a full diagnostic report with invoice parsing and fix recommendations, run a scan. You'll set the maximum spend in sats and only pay if the scan completes.
Questions? Reach out at support@maximumsats.com.
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