x402.org

x402 protocol registry and specification

Endpoint	`https://x402.org`
Trust	100% uptime over 1 checks · ~128 ms
Pricing	Pay per call with x402, no account. Call it to get an exact quote before paying.
docs url	https://x402.org
auth	none
source	x402_registry

Use it

Call it (an x402 client pays automatically)

curl -i https://x402.org
# 402 reply -> sign PAYMENT-REQUIRED with an x402 client (e.g. @x402/fetch) -> retry with PAYMENT-SIGNATURE

This listing as JSON

curl https://aipaygen.com/v1/catalog/api/240

Search the whole marketplace from your agent (MCP)

{
  "mcpServers": {
    "aipaygen": {
      "url": "https://aipaygen.com/mcp"
    }
  }
}