402 Index
The paid API directory for AI agents — indexed, verified, and searchable
Ecosystem Overview
166,550
Endpoints Indexed
80,189
Payment-Verified
4,960
Providers Indexed
3,034
Providers Verified
L402 Lightning Network
Verified305 / 2,133 (14%)
Providers32 / 96 (33%)
Healthy305
Decentralized, censorship-resistant, locally verifiable
x402 Base, Solana, etc.
Verified78653 / 162,121 (49%)
Providers2967 / 4807 (62%)
Healthy80200
Centralized facilitator required (4+ available), Base/Solana chains
MPP Stripe / Tempo
Verified1231 / 2,296 (54%)
Verified (gateway-backed)78 / 350 (22%)
Providers82 / 136 (60%)
Healthy1231
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://api.satspipe.com/v1/macro/yield-curve
2
Server Returns 402
Server requires payment — returns 402 with payment instructions
WWW-Authenticate: L402 macaroon="AGIAJEem...", invoice="lnbc50n1..."
3
Agent Pays Invoice
Agent pays Lightning invoice automatically via lnget or wallet
Lightning BOLT11 invoice Amount: 50 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": "..." }