Whether a number has a WhatsApp account, and nothing else
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.
Not tested: has real-world effectsour last check, 2026-10-10
0 of 0checks answered this week
n/amedian answer time
$0.004listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://wtsp.dev/v1/exists
| Category | Code and developer |
|---|---|
| Provider host | wtsp.dev |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"phone": "+14155552671"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$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"
}