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wtsp.dev WhatsApp Phone Number Lookup
x402
wtsp.dev WhatsApp Phone Number Lookup is a paid API for AI agents from wtsp.dev, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-11).
Check whether a given phone number is registered on WhatsApp and retrieve basic account status
Price / call$0.004
Success—
StatusUnknown
How this service works
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.
Output
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.
Example use cases
Pre-outreach WhatsApp channel check
“Before I send a WhatsApp message to my new lead at +447700900123, can you check if that number is actually on WhatsApp?”
CRM contact enrichment
“I have a contact with phone number +5511999887766 — find out whether they have a WhatsApp account so I can update their profile.”
Bulk lead qualification triage
“I'm about to contact a prospect at +33612345678 — verify if this number has WhatsApp so my agent knows which channel to use.”
Technical details
Endpoint
GEThttps://wtsp.dev/v1/exists?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"phone": "+14155552671",
"checkedAt": "2026-10-09T18:24:03.000Z",
"hasWhatsApp": true
}
}Tags
x402
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