{"slug":"wtsp-dev-v1-exists-c9eeca","title":"Whether a number has a WhatsApp account, and nothing else","host":"wtsp.dev","method":"GET","resource":"https://wtsp.dev/v1/exists","category":"code","description":"Whether a number has a WhatsApp account, and nothing else: the cheapest way to clean a list before paying for profiles. /v1/profile gives the same answer plus the account's details. Query param: phone, with country code (e.g. +14155552671). Every answer is charged, “not on WhatsApp” included; a look","price_listed":0.004,"price_asked":null,"state":"effects","state_label":"Not tested: has real-world effects","checks_7d":0,"answered_7d":0,"latency_ms_median":null,"reported_calls_30d":0,"reported_payers_30d":0,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"method":"GET","queryParams":{"phone":"+14155552671"},"type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"method":{"enum":["GET"],"type":"string"},"queryParams":{"properties":{"phone":{"description":"Phone number with its country code, e.g. +14155552671. The + is optional; spaces, dashes and a leading 00 are fine.","type":"string"}},"required":["phone"],"type":"object"},"type":{"const":"http","type":"string"}},"required":["type","method"],"type":"object"},"output":{"properties":{"example":{"properties":{"checkedAt":{"description":"When this answer was fetched from WhatsApp (ISO 8601).","type":"string"},"hasWhatsApp":{"description":"Whether the number is a registered WhatsApp account. `false` is a definitive answer, not a failure.","type":"boolean"},"phone":{"description":"The number looked up, in E.164.","type":"string"}},"required":["phone","hasWhatsApp","checkedAt"],"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[],"description_full":"Whether a number has a WhatsApp account, and nothing else: the cheapest way to clean a list before paying for profiles. /v1/profile gives the same answer plus the account's details. Query param: phone, with country code (e.g. +14155552671). Every answer is charged, “not on WhatsApp” included; a lookup WhatsApp does not answer is free.","last_updated":"2026-10-10T15:27:55.934Z","schemes":["exact"]}