Marketplace · API · x402

api.webbersites.com/api/calc

Exact math for agents — the arithmetic LLMs get plausibly wrong. Evaluates an expression at 50-significant-digit precision (BigNumber): big-integer multiplication, high-precision division, roots, logs, factorials, unit conversions (12 inch to cm). GET ?expr=…, result returned as an exact string. Deterministic, no AI, never executed as code.

Endpoint	`https://api.webbersites.com/api/calc`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~355 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	0xdd5fcEa81CA6f1EB39FEd5B973DE794293B81ba6
method	GET
last updated	2026-11-11T02:32:15.973Z

Use it

Call it (an x402 client pays automatically)

curl -i https://api.webbersites.com/api/calc
# 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/x402-2fe81c4fbd1bcab6

Search the whole marketplace from your agent (MCP)

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