# PaywallWatch

> Email address screening for agents, paid per call over x402. Syntax, DNS mail exchanger, disposable-domain list, role-account, free-provider and typo heuristics. It does not verify that the mailbox exists.

## Pages
- https://paywallwatch.com/: what one check does, when a request is charged, data handling, support
- https://paywallwatch.com/quickstart: a runnable first paid check (TypeScript, one payment attempt, capped at the route price)
- https://paywallwatch.com/sample: fixed, dated examples of every verdict; nothing is called or charged
- https://paywallwatch.com/.well-known/agent.json: this service as an agent card

## Paid routes (x402 v2, USDC on Base or Solana; an unpaid GET answers 402 with the terms)
- GET /v1/ping at https://api.paywallwatch.com/v1/ping: $0.01 per call. Use when testing an x402 client end to end. Returns ok and the server time; costs one cent.
  Example: GET https://api.paywallwatch.com/v1/ping
- GET /v1/email/verify at https://api.paywallwatch.com/v1/email/verify: $0.003 per call. 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.
  Example: GET https://api.paywallwatch.com/v1/email/verify?email=jane@iana.org

## Limits
- Screening only: it does not verify that the mailbox exists or that mail will be delivered.
- A DNS failure answers 503 and is not charged; a rejected payment answers 402 and is not charged.
- No account, no API key, no batch endpoint; one address per call.
- Operated by Aura AI Agents L.L.C-FZ.