Marketplace · API · x402

x402.klimalabs.com/api/catalog

Entry point to the x402 Carbon Retirement API on Base. Returns every endpoint you need plus a live snapshot of the top 3 carbon classes and marketplace listings by liquidity. Discover, quote and certificate are free. Retiring is paid: each retirement costs the credit price plus a fee, sent from your own wallet (prepare/retire) or relayed from a signed USDC authorization (prepare-auth + POST actions/retire). Full spec at /openapi.json.

Endpoint	`https://x402.klimalabs.com/api/catalog`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~255 ms
Pricing	Pay per call with x402, no account. Call it to get an exact quote before paying.
network	eip155:8453
scheme	exact
pay to	0xf624f9Fe1D3165c5Ca32c7Fbdbf82f4a5b1D2d0e
method	GET
last updated	2026-11-12T19:30:51.503Z

Use it

Call it (an x402 client pays automatically)

curl -i https://x402.klimalabs.com/api/catalog
# 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/x402-93fda07eb9d86e9c

Search the whole marketplace from your agent (MCP)

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