# Phone Number Validator - Carrier, Line Type & WhatsApp Check A lead generation tool your agent can run on one prepaid apifare key. Page: https://apifare.com/tools/memo23/whatsapp-number-validator ## What you need An apifare key with credits (sign up: POST https://apifare.com/v1/signup {"email": "..."}; new accounts get 500 free credits). No other account or key. ## Inputs - `phoneNumbers` (array): Phone numbers - `phoneNumbersText` (string): Phone numbers (paste a list) - `defaultCountry` (string): Default country - `includeGeoCarrier` (boolean): Include region & carrier - `onlyValid` (boolean): Only output valid numbers - `onlyWhatsAppReady` (boolean): Only output WhatsApp-ready numbers The most relevant fields; the search result's input_schema lists all of them. ## Price 5 credits reserved per run, settled to the run's true cost, never more than 20 credits (1 credit = $0.01). Failed runs are refunded. Exact numbers: https://apifare.com/capabilities ## Run it 1. Find it: MCP search_apis, or GET https://apifare.com/v1/search?q=Phone%20Number%20Validator%20-%20Carrier%2C%20Line%20Type%20%26%20WhatsApp%20Check with Authorization: Bearer . Take the result named "Phone Number Validator - Carrier, Line Type & WhatsApp Check"; it carries a proxy_route. 2. Run it: MCP proxy_call with that proxy_route and the input JSON (apifare-mcp over stdio), or POST the proxy_route over HTTP with the input JSON as the body and the same Authorization header. 3. On HTTP 402, relay the body's human_readable field to your human verbatim, wait, then retry the same call. Every other error and its fix: https://apifare.com/errors.md