402 Index
The paid API directory for AI agents — indexed, verified, and searchable
Ecosystem Overview
81,047
Endpoints Indexed
20,231
Payment-Verified
2,217
Providers Indexed
1,208
Providers Verified
L402 Lightning Network
Verified720 / 1,233 (58%)
Providers25 / 79 (32%)
Healthy720
Decentralized, censorship-resistant, locally verifiable
x402 Base, Solana, etc.
Verified18920 / 78,432 (24%)
Providers1140 / 2068 (55%)
Healthy20163
Centralized facilitator required (4+ available), Base/Solana chains
MPP Stripe / Tempo
Verified591 / 1,382 (43%)
Verified (gateway-backed)177 / 378 (47%)
Providers56 / 102 (55%)
Healthy591
Stripe/Tempo facilitated, session-based settlement
Agent Discovery
Search the directory like an AI agent would through the MCP server
MCP Tool Call
{
"tool": "search_services",
"arguments": {}
}
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Live Endpoint Health Check
Paste any API URL to run a real-time health check — see the protocol handshake live
Payment Flow
How an agent pays for an API call — step by step
1
Agent Sends Request
Agent discovers endpoint via 402index and sends request
GET https://parsebit-lnd.fly.dev/summarise/upload
2
Server Returns 402
Server requires payment — returns 402 with payment instructions
WWW-Authenticate: L402 macaroon="AGIAJEem...", invoice="lnbc500n1..."
3
Agent Pays Invoice
Agent pays Lightning invoice automatically via lnget or wallet
Lightning BOLT11 invoice Amount: 500 sats Expiry: 60 seconds
4
Agent Retries with Token
Agent retries request with proof of payment
Authorization: L402 <macaroon>:<preimage>
5
Server Returns 200
Server validates payment and returns the requested data
HTTP/1.1 200 OK
Content-Type: application/json
{ "data": "..." }