Marketplace · API · x402

toll402.dev/v1/t/fn_at_validate

Offline validator for an Austrian Firmenbuchnummer (FN), the company register number. Normalizes the numeric part (1-6 digits, left-padded to 6 for calculation), computes the modulo-11 check letter using weights 2,1,2,1,2,1 (Luhn-style digit reduction for products >=9 by subtracting 9) and the standard letter table (0=p,1=a,2=b,3=c,4=d,5=e,6=f,7=g,8=h,9=i,10=k), and compares it to the supplied check letter.

Endpointhttps://toll402.dev/v1/t/fn_at_validate
Trust✓ Verified callable · 100% uptime over 1 checks · ~370 ms
PricingPay per call with x402, no account. Call it to get an exact quote before paying.
networkeip155:8453
schemeexact
pay to0x318d34fa0bd69eff17fac648d2df8cf7a88b3dbe
methodPOST
last updated2026-11-11T15:58:16.25Z

Use it

Call it (an x402 client pays automatically)

curl -i https://toll402.dev/v1/t/fn_at_validate
# 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-e76bbd422989de22

Search the whole marketplace from your agent (MCP)

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