{"uid":"cap_3GkX5EhaBfPYIDKsI1g3W","slug":"wtsp-dev-whatsapp-phone-number-lookup-c89f53fb","name":"wtsp.dev WhatsApp Phone Number Lookup","description":"Look up any phone number on WhatsApp: registration, business profile, profile photo and carrier. AI agents pay per request in USDC on Base with x402. No sign-up, no API key.","url":"https://wtsp.dev/v1/exists?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["phone"],"properties":{"phone":{"type":"string","description":"Phone number with its country code, e.g. +14155552671. The + is optional; spaces, dashes and a leading 00 are fine."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","required":["phone","hasWhatsApp","checkedAt"],"properties":{"phone":{"type":"string","description":"The number looked up, in E.164."},"checkedAt":{"type":"string","description":"When this answer was fetched from WhatsApp (ISO 8601)."},"hasWhatsApp":{"type":"boolean","description":"Whether the number is a registered WhatsApp account. `false` is a definitive answer, not a failure."}}}}}}},"responseSchema":{"type":"json","example":{"phone":"+14155552671","checkedAt":"2026-10-09T18:24:03.000Z","hasWhatsApp":true}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.004","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.004/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_cZrHqa6jli-lxu2VbWLS-","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.004","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Check whether a given phone number is registered on WhatsApp and retrieve basic account status","exampleAgentPrompt":"Can you check if the phone number +14155552671 is registered on WhatsApp so I know if I can reach them there?","exampleUseCases":[{"title":"Pre-outreach WhatsApp channel check","prompt":"Before I send a WhatsApp message to my new lead at +447700900123, can you check if that number is actually on WhatsApp?"},{"title":"CRM contact enrichment","prompt":"I have a contact with phone number +5511999887766 — find out whether they have a WhatsApp account so I can update their profile."},{"title":"Bulk lead qualification triage","prompt":"I'm about to contact a prospect at +33612345678 — verify if this number has WhatsApp so my agent knows which channel to use."}],"resultDescription":"Returns a JSON object with the looked-up phone number in E.164 format, a boolean `hasWhatsApp` indicating whether the number is registered on WhatsApp, and an ISO 8601 timestamp of when the check was performed. A `false` value is a definitive negative answer, not an error.","failureModes":["Invalid or unparseable phone number format returns an error","Phone number with unsupported country code may return an error","Rate limiting or payment failure (x402) results in a 402 Payment Required response","Transient WhatsApp API unavailability may cause temporary lookup failures"],"whenToPreferThis":"Use this endpoint when you need a lightweight, no-signup, per-request WhatsApp registration check paid in USDC via x402. Ideal for AI agents that need to verify WhatsApp reachability for a contact before initiating outreach, enriching CRM records, or routing messages to the right channel — without managing API keys or subscriptions.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T12:37:53.277Z","isFirstParty":false,"canonicalSlug":"wtsp-dev-whatsapp-phone-number-lookup-c89f53fb"}