Check which leads exist

Check up to 1,000 emails in one request and get back which ones already exist as leads in the workspace. Use this instead of calling GET /v1/leads/{email} once per email when you only need a yes/no answer — one request replaces many and returns no lead details.

Emails are normalized the same way as imports (lowercased, trimmed, stray characters removed); the response lists the normalized emails. Duplicates in the input are checked once. Inputs that are not a valid email after cleanup are returned in invalid. results has one entry per input, in request order, showing the email each input was checked as.

curl -X POST "https://api.sendkit.ai/v1/leads/exists" \
  -H "Content-Type: application/json" \
  -H "X-Api-Key: YOUR_API_KEY" \
  -d '{
  "emails": [
    "john@acme.com",
    "jane@acme.com",
    "not-an-email"
  ]
}'

import requests
import json

url = "https://api.sendkit.ai/v1/leads/exists"
headers = {
  "Content-Type": "application/json",
  "X-Api-Key": "YOUR_API_KEY"
}
data = {
  "emails": [
    "john@acme.com",
    "jane@acme.com",
    "not-an-email"
  ]
}

response = requests.post(url, headers=headers, json=data)
print(response.json())

const response = await fetch("https://api.sendkit.ai/v1/leads/exists", {
  method: "POST",
  headers: {
  "Content-Type": "application/json",
  "X-Api-Key": "YOUR_API_KEY"
},
  body: JSON.stringify({
  "emails": [
    "john@acme.com",
    "jane@acme.com",
    "not-an-email"
  ]
})
});

const data = await response.json();
console.log(data);

package main

import (
    "fmt"
    "net/http"
    "bytes"
    "encoding/json"
)

func main() {
    data := []byte(`{
  "emails": [
    "john@acme.com",
    "jane@acme.com",
    "not-an-email"
  ]
}`)

    req, err := http.NewRequest("POST", "https://api.sendkit.ai/v1/leads/exists", bytes.NewBuffer(data))
    if err != nil {
        panic(err)
    }

    req.Header.Set("Content-Type", "application/json")
    req.Header.Set("X-Api-Key", "YOUR_API_KEY")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    fmt.Println("Response Status:", resp.Status)
}

require 'net/http'
require 'json'

uri = URI('https://api.sendkit.ai/v1/leads/exists')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request['X-Api-Key'] = 'YOUR_API_KEY'
request.body = '{
  "emails": [
    "john@acme.com",
    "jane@acme.com",
    "not-an-email"
  ]
}'

response = http.request(request)
puts response.body

{
  "success": true,
  "data": {
    "exists": [
      "john@acme.com"
    ],
    "missing": [
      "jane@acme.com"
    ],
    "invalid": [
      "not-an-email"
    ],
    "results": [
      {
        "input": "john@acme.com",
        "email": "john@acme.com",
        "status": "exists"
      },
      {
        "input": "jane@acme.com",
        "email": "jane@acme.com",
        "status": "missing"
      },
      {
        "input": "not-an-email",
        "email": null,
        "status": "invalid"
      }
    ],
    "counts": {
      "checked": 2,
      "exists": 1,
      "missing": 1,
      "invalid": 1
    }
  }
}