tickstem/verify

Go SDK for Tickstem — email verification for production apps.

Checks syntax, MX records, disposable domains, and role-based prefixes before an address touches your database.

Install

go get github.com/tickstem/verify

Quick start

package main

import (
    "context"
    "fmt"
    "log"
    "os"

    "github.com/tickstem/verify"
)

func main() {
    client := verify.New(os.Getenv("TICKSTEM_API_KEY"))

    result, err := client.Verify(context.Background(), "[email protected]")
    if err != nil {
        log.Fatal(err)
    }

    fmt.Println(result.Valid)      // true if safe to store
    fmt.Println(result.Disposable) // true if throwaway address
    fmt.Println(result.RoleBased)  // true if generic inbox (admin@, info@, ...)
    fmt.Println(result.Reason)     // explanation when Valid is false
}

Get your API key at app.tickstem.dev.

Usage

Create a client

// Minimal — uses https://api.tickstem.dev/v1
client := verify.New(os.Getenv("TICKSTEM_API_KEY"))

// With options
client := verify.New(apiKey,
    verify.WithBaseURL("http://localhost:8080/v1"),
)

Verify an email

result, err := client.Verify(ctx, "[email protected]")
if err != nil {
    if verify.IsQuotaExceeded(err) {
        // monthly quota hit — upgrade at app.tickstem.dev/dashboard/billing
    }
    log.Fatal(err)
}

if !result.Valid {
    return fmt.Errorf("email not accepted: %s", result.Reason)
}

if result.RoleBased {
    // warn but don't block — some teams share an inbox
}

What gets checked

Check	What it catches	Why it matters
Syntax	Malformed addresses (user@@example, missing TLD)	Reject obviously bad input before any network call
MX lookup	Domains with no mail server (gmial.com, abandoned domains)	Catch typos and dead domains that pass syntax checks
Disposable	Throwaway services (Mailinator, Guerrilla Mail, 200+ others)	Block single-use signups that inflate user counts and churn immediately
Role-based	Generic inboxes (admin@, info@, noreply@, support@, ...)	Flag addresses shared by teams or bots — poor engagement, not tied to a real person

No SMTP probing — the recipient mail server is never contacted.

Retrieve history

page, err := client.ListHistory(ctx, verify.ListHistoryParams{
    Limit:  50,
    Offset: 0,
})
for _, v := range page.Verifications {
    fmt.Printf("%s  valid=%v  disposable=%v\n", v.Email, v.Valid, v.Disposable)
}

Error handling

result, err := client.Verify(ctx, email)
if err != nil {
    if verify.IsUnauthorized(err) {
        // invalid or revoked API key
    }
    if verify.IsQuotaExceeded(err) {
        // monthly verification limit reached
    }
    var apiErr *verify.APIError
    if errors.As(err, &apiErr) {
        fmt.Println(apiErr.StatusCode, apiErr.Message)
    }
}

Pricing

Plan	Verifications/month	Price
Free	500	$0
Starter	5,000	$12/mo
Pro	50,000	$29/mo
Business	500,000	$79/mo

View full pricing →

License

MIT