Marketplace · API · x402

email-verifier.underscoredone.com/verify

Takes one email address and tells you whether it can actually receive mail. Returns a verdict of valid, invalid, or risky, splits the address into username and domain, and flags free providers and role accounts like admin@ or support@. One address per call.

Endpoint	`https://email-verifier.underscoredone.com/verify`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~194 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	0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08
method	POST
last updated	2026-10-21T07:01:43.498Z

Use it

Call it (an x402 client pays automatically)

curl -i https://email-verifier.underscoredone.com/verify
# 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/x402-478fb0b160a38846

Search the whole marketplace from your agent (MCP)

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

Email address verification (AIPayGen)
API$0.002/call

email-verifier.underscoredone.com/verify

Use it

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