apio

Use cases · Email Verification APIs

Best APIs for Bulk Email List Verification

APIs built to clean large email lists in batch - upload a list, get per-address verdicts back - for deliverability and list hygiene at scale.

Required capability: Bulk / list.

Our pick: ZeroBounce

Accurate, fast and secure email verification service

Best for: Prototypes and side projects - free to start, no sales call; Regulated or enterprise workloads - compliance attestations and an enterprise plan; AI agents and automation - an agent-ready surface (MCP / llms.txt).

ZeroBounce profile →

Best for…

Best overall
ZeroBounce - our default pick: strongest across pricing, trust and breadth
Best free pick
ZeroBounce - free tier: 100 free monthly email verifications, 10 free Email Finder queries, 1 Email Inbox Placeme…
Best for enterprise
ZeroBounce - for regulated or large teams: SOC 2 Type II, HIPAA, published SLA
Cheapest to start
Verifalia - from $9 month to start; compare on your real usage, not the entry price
Best for agents
ZeroBounce - easiest to wire up programmatically: MCP server + llms.txt
Broadest surface
Hunter - 31 documented actions; breadth isn't quality, but it's the most to build on

Ranked (10)

  • #1 ZeroBounce

    85 / 100
    • Best overall
    • Best free pick
    • Best for enterprise
    • Best for agents

    Accurate, fast and secure email verification service

    PricingUsage · from $39 2,000 emails · free tier ✓
    TrustSOC 2 Type II · HIPAA · GDPR · ISO 27001 · PCI DSS
    Does
    • Real-time / single
    • Bulk / list
    • Catch-all detection
    • Disposable detection
    • Role-account detection
    • Spam-trap detection
    • SMTP / mailbox check
    • Quality scoring
    • Data enrichment
    • Native integrations
    Used byAirbnb, Intel, LinkedIn, Samsung

    ZeroBounce profile →

  • #2 Hunter

    74 / 100
    • Broadest surface

    A free email checker to instantly spot risky or fake email addresses. Verify emails with thorough checks: format, domain information, servers response, accept-all.

    PricingHybrid · from $49 month · free tier ✓
    TrustGDPR
    Does
    • Real-time / single
    • Bulk / list
    • Catch-all detection
    • Disposable detection
    • Role-account detection
    • Quality scoring
    • Data enrichment
    • Native integrations
    Used bySemrush, Vimeo, Cisco, Canva
    The catchVerification is a secondary feature: Hunter is built for finding and prospecting emails, not bulk list hygiene.

    Hunter profile →

  • #3 Verifalia

    60 / 100
    • Cheapest to start

    Email list cleaning and real-time email verification service

    PricingHybrid · from $9 month · free tier ✓
    TrustGDPR · ISO 27001
    Does
    • Real-time / single
    • Bulk / list
    • Catch-all detection
    • Disposable detection
    • Role-account detection
    • SMTP / mailbox check
    • Quality scoring
    Avoid ifYou have strict compliance requirements

    Verifalia profile →

  • #4 Clearout

    61 / 100

    Clearout is a real-time data quality engine that helps sales, marketing, customer success, product, and operations (Go-To-Market) teams maintain their contact data in a clean, accurate, and conversion-ready state.

    PricingHybrid · from $21 3,000 credits · free tier ✗
    TrustSOC 2 Type II · GDPR · ISO 27001
    Does
    • Real-time / single
    • Bulk / list
    • Catch-all detection
    • Disposable detection
    • Role-account detection
    • Quality scoring
    • Data enrichment
    • Native integrations
    Used bySigParser, Pearl Lemon, Logic Inbound
    Avoid ifYou want to try it free before paying

    Clearout profile →

  • #5 Emailable

    68 / 100

    The most accurate email verification platform

    PricingUsage · from $25.50 month · free tier ✗
    TrustSOC 2 Type II · GDPR · ISO 27001
    Does
    • Real-time / single
    • Bulk / list
    • Catch-all detection
    • Disposable detection
    • Role-account detection
    • Quality scoring
    • Native integrations
    Used byleadlovers, Funky Christmas Jumpers
    Avoid ifYou want to try it free before paying

    Emailable profile →

  • #6 Bouncer

    61 / 100

    Bouncer Email Verification API lets you validate email address and verify its deliverability, in the way you want.

    PricingUsage · from $8 1,000 emails · free tier ✗
    TrustSOC 2 Type I · GDPR
    Does
    • Real-time / single
    • Bulk / list
    • Catch-all detection
    • Disposable detection
    • Role-account detection
    • SMTP / mailbox check
    • Quality scoring
    • Native integrations
    Used byVipeCloud, ActivePipe, BigMailer, BookYourData
    Avoid ifYou want to try it free before paying

    Bouncer profile →

  • #7 Kickbox

    73 / 100

    Kickbox is your all-in-one email verification platform, packed with the features, integrations and security you need to keep your email data clean and deliverable.

    PricingUsage · from $5 500 verifications · free tier ✓
    TrustGDPR
    Does
    • Real-time / single
    • Bulk / list
    • Catch-all detection
    • Disposable detection
    • Role-account detection
    • SMTP / mailbox check
    • Quality scoring
    • Native integrations
    Used byReddit, The Zebra, Kayak, Capital One
    Avoid ifYou have strict compliance requirements

    Kickbox profile →

  • #8 AbstractAPI Email Validation API

    77 / 100

    Verify Any Email in Real Time

    PricingHybrid · from $17 month · free tier ✓
    TrustSOC 2 Type II · GDPR
    Does
    • Real-time / single
    • Bulk / list
    • Disposable detection
    • Role-account detection
    • SMTP / mailbox check
    • Quality scoring
    Used byCompass, Wolters Kluwer, Salesforce, Google

    AbstractAPI Email Validation API profile →

  • #9 NeverBounce

    49 / 100

    NeverBounce is a Real-Time Email Verifier and Email List Cleaner.

    PricingHybrid · from $8 1,000 emails · free tier ✗
    TrustGDPR
    Does
    • Real-time / single
    • Bulk / list
    • Catch-all detection
    • Disposable detection
    • Role-account detection
    • SMTP / mailbox check
    • Native integrations
    Avoid ifYou want to try it free before paying

    NeverBounce profile →

  • #10 MillionVerifier

    50 / 100

    The most comprehensive email verification service with 99%+ accuracy, the lowest prices, and a real 100% money-back guarantee for risky emails.

    PricingUsage · from $4.90 2,000 credits · free tier ✗
    TrustGDPR
    Does
    • Real-time / single
    • Bulk / list
    • Catch-all detection
    • Disposable detection
    • Role-account detection
    Avoid ifYou want to try it free before paying

    MillionVerifier profile →

Scope: only APIs with the required capability, picked from published, cited data. The score is one input, not the verdict, and we lead with each one’s trade-off. No reviews yet, no paid placement. See the full Email Verification APIs directory.