Our lightning L402 has 1,185 services. Most developers building Lightning apps have no idea they exist or how to find the reliable ones.

L402 is the protocol that lets an HTTP server require a Lightning payment before returning data. An app sends a request, gets back a 402 with a Lightning invoice, pays it, retries, gets the data. No accounts, no subscriptions, no OAuth. Just a payment and a response.

The problem is there's no good way to find these services or know which ones actually work.

We've been building a cross-protocol index that covers L402, x402 (USDC on Base), and MPP. Currently 1,185 L402 services in the index. Financial data feeds, AI inference, real-time data, developer utilities. Most pay per call in the $0.001 to $0.05 range.

What we found after testing all of them: quality varies wildly. A lot of services accept the Lightning payment and return nothing, or return stale data, or are just down. We grade all of them A through F based on weekly canary testing.

Current L402 breakdown: 2 grade A services, a handful of B, most are C or D. The ecosystem is real and growing but reliability is the gap.

If you're building Lightning-enabled apps and want to add paid data feeds or services, the index is free to search. If you're running an L402 service and want to see your grade, it's at the same place.

api.ideafactorylab.org/leaderboard - filter by L402 protocol.

Happy to answer questions about the L402 payment flow if anyone is working through it.