402 Index
The paid API directory for AI agents — indexed, verified, and searchable
Ecosystem Overview
66,785
Endpoints Indexed
31,966
Payment-Verified
1,498
Providers Indexed
916
Providers Verified
L402 Lightning Network
Verified619 / 1,239 (50%)
Providers30 / 80 (38%)
Healthy619
Decentralized, censorship-resistant, locally verifiable
x402 Base, Solana, etc.
Verified30884 / 64,764 (48%)
Providers842 / 1348 (62%)
Healthy31293
Centralized facilitator required (4+ available), Base/Solana chains
MPP Stripe / Tempo
Verified463 / 782 (59%)
Verified (gateway-backed)176 / 378 (47%)
Providers52 / 99 (53%)
Healthy463
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": "..." }