Marketplace · API · x402

api.paywallwatch.com/v1/email/verify

Use when an agent needs email validation, screening only, for an address from a form, a scrape or a CRM and must decide whether it is worth sending to. Screens the address: syntax, DNS mail exchanger, disposable domain, role account, free provider and common typos. It does not verify that the mailbox exists. A DNS failure answers 503 and is not charged.

Endpoint	`https://api.paywallwatch.com/v1/email/verify`
Trust	Not checked yet
Pricing	Pay per call with x402, no account. Call it to get an exact quote before paying.
network	eip155:8453
scheme	exact
pay to	0xAE71740237442f5f1a2A7b4f59A201e9a4350C0C
method	GET
last updated	2026-11-12T14:25:55.488Z

Use it

Call it (an x402 client pays automatically)

curl -i https://api.paywallwatch.com/v1/email/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-c5694d27c0cb81b3

Search the whole marketplace from your agent (MCP)

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

Email address verification (AIPayGen)
API$0.002/call

api.paywallwatch.com/v1/email/verify

Use it

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