Marketplace · API · x402

x402-agent-api.onrender.com/api/v1/hvac-duct-size

HVAC duct sizing calculator: any two of duct size (round or rectangular), airflow, velocity and friction rate. Round and rectangular equivalents, nearest standard sizes, friction loss per 100 ft (Darcy-Weisbach, Colebrook), velocity pressure, design checks. Equal-friction sizing, fixed-depth ducts, IP or SI. Shows every step with the numbers. $0.002 USDC per call.

Endpointhttps://x402-agent-api.onrender.com/api/v1/hvac-duct-size
Trust100% uptime over 1 checks · ~186 ms
PricingPay per call with x402, no account. Call it to get an exact quote before paying.
networkeip155:8453
schemeexact
pay to0x6847231bD28E16A0A57c59793f6B8BD8CC0043aC
methodPOST
last updated2026-10-25T11:38:08.727Z

Use it

Call it (an x402 client pays automatically)

curl -i https://x402-agent-api.onrender.com/api/v1/hvac-duct-size
# 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/x402-2da5b09dbaa1ddfd

Search the whole marketplace from your agent (MCP)

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

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