Top 5 Disposable Email Detection APIs (2026)

Compare five disposable email detection APIs for 2026 by pricing, free plans, detection coverage and measured latency. Find the right API for signup protection.

IronDome, Abstract, Kickbox, Mailboxlayer, and DISIFY offer disposable email detection APIs for signup screening. Compare their free plans, paid pricing, detection scope, and response handling before choosing a service. A disposable verdict answers a different question from mailbox deliverability or ownership.

This guide compares five disposable email checker APIs in 2026. It covers detection services, not temporary email APIs that create inboxes.

Free plans and paid pricing at a glance

• IronDome: 500 free checks per month, then $1 per 1,000 checks without a subscription.
• Abstract: 100 free requests per month. Professional is one paid option at $39 per month for 5,000 requests; confirm the fields and billing interval you need.
• Kickbox API: free disposable-check endpoint. Its separate commercial verification API offers 100 starter credits, then packs such as $5 for 500 verifications.
• Mailboxlayer: 100 free monthly requests for non-commercial use. Basic is $14.99 per month for 5,000 commercial-use requests, with overage charges.
• DISIFY: 30,000 free validations per month with daily and rate limits. Starter is US$9 per month; Pro is US$19 per month, plus applicable VAT and subject to rate limits.

Prices and allowances were checked on October 27, 2026. The provider sections below explain request limits, plan differences, and measured results.

What makes a disposable email detection API useful?

Start with the decision your application needs to make. Disposable screening, mailbox deliverability, and email ownership are separate questions. An address can receive an OTP and still be disposable. A non-disposable result does not prove that the person signing up owns the mailbox.

For signup screening, compare these properties:

• Detection scope: Does the service classify domains, individual addresses, or both? A domain-only lookup cannot distinguish two addresses hosted on the same provider.
• Response contract: Is there an explicit disposable result? Keep missing fields, invalid responses, and timeouts separate from a negative result.
• Operational limits: Check burst limits, monthly allowances, commercial-use terms, and what happens when you exhaust them.
• Evidence: Evaluate recently observed disposable addresses alongside legitimate controls. Measure false positives as carefully as missed detections.

1. IronDome: focused disposable email screening

IronDome is built for screening email addresses before account creation or trial access. It identifies known disposable domains and addresses, including temporary addresses hosted on shared providers such as Gmail and Outlook. Its published offering includes hourly updates and SDKs for JavaScript, Python, Go, and Rust.

Free access: 500 checks each month. Additional usage costs $1 per 1,000 checks, without a subscription.

Choose IronDome when you need fast disposable-email detection to protect free trials, promotional credits and signup incentives from abuse. Its detection covers known temporary addresses on shared providers such as Gmail and Outlook, not just disposable domains, with disposable email domains and addresses updated every hour.

Fast checks across regions: IronDome recorded warm-connection median latency below 20 ms across all four tested regions: US East, US West, Europe and Singapore. Medians ranged from 4.84 to 15.52 ms, including network and response handling. See the published benchmarks for the setup, tail latency and fresh-connection results.

2. Abstract: disposable detection with broader email signals

Abstract's Email Reputation API combines disposable detection with deliverability and additional email information. Its documented responses include format, MX, and SMTP-related results, while richer tiers expose sender, domain, quality, risk, and breach information.

Pricing: The free plan includes 100 requests per month at three requests per second. As one paid option, Professional is listed at $39 per month for 5,000 requests. View plans.

Choose Abstract when your application needs more than a disposable decision, such as separate handling for undeliverable addresses and risky signups. Check the response fields available on the plan you intend to buy: the free evaluation and paid tiers do not all expose the same groups of information.

Avoid treating a general quality score as interchangeable with a disposable flag. Decide which field controls each application action.

For response-field mapping and signup migration steps, see our Abstract API alternative guide.

3. Kickbox API

Kickbox API accepts an email address or domain for disposable screening. This section covers its free disposable endpoint, separate from its commercial email verification product.

Pricing: The disposable-check endpoint is free. The separate commercial verification API includes 100 starter credits; paid packs include 500 verifications for $5 or 5,000 for $40. View plans.

It is a candidate for a straightforward disposable lookup. If you also need broader verification, evaluate the commercial product separately rather than assuming the public endpoint exposes those capabilities.

The public checker is supplied on an as-available basis. Before putting it on a critical signup path, establish the support and availability requirements your application needs.

If you are switching your disposable-email check, our Kickbox API alternative guide covers the endpoint changes and migration checklist.

4. Mailboxlayer: validation and disposable-provider filtering

Mailboxlayer combines disposable-provider filtering with syntax, typo, MX, and SMTP-related checks. This makes it relevant when the same integration must help evaluate address validity as well as temporary-email usage.

Pricing: The free plan includes 100 monthly requests for non-commercial use. Basic costs $14.99 per month for 5,000 requests and permits commercial use. Usage beyond the plan allowance incurs additional charges. View plans.

That licensing distinction matters for a production SaaS signup form. A free allowance does not automatically mean free commercial deployment.

Verify the HTTPS endpoint and supported features for your chosen plan before integration. Do not send API keys or email addresses over an unencrypted connection.

For commercial-use pricing and response-field migration, read our Mailboxlayer alternative guide.

5. DISIFY: disposable detection with syntax and DNS signals

DISIFY checks disposable indicators alongside email syntax and mail DNS. Its documentation describes domain and mail-server checks, plus per-address detection of known base accounts and alias patterns on shared providers. It also returns confidence and supporting signals.

Pricing: Free accounts include 30,000 validations per month, with limits of 10,000 per day and 60 requests per minute. Starter costs US$9 per month at 120 requests per minute; Pro costs US$19 per month at 500 requests per minute, plus VAT where applicable. Paid plans remove the monthly quota, not the rate limit. See plans and first-day and anonymous-access limits.

Measured latency: In our 99 successful requests, median response time was 3.53 seconds and p95 was 7.94 seconds. These were non-pooled requests from one cloud location, so the results are not directly comparable with IronDome’s warm-connection regional measurements. One network-error request was excluded from these latency figures.

Read the explicit disposable field rather than inferring it from DNS or provider-whitelist fields. Paid privacy-relay controls are separate from the disposable verdict.

What our limited DISIFY test showed

On October 27, 2026, we submitted 100 entries from a historical IronDome-selected list. DISIFY flagged 44 as disposable, returned a negative result for 55, and one request failed at the network level. Among the shared-provider entries, it flagged 6 of 25 Gmail addresses, none of 25 Outlook addresses, 2 of 10 Hotmail addresses, and all 6 iCloud addresses.

These are agreement counts against that list, not accuracy or verified missed-detection rates. The source snapshot was from August, the addresses had been canonicalized, and the sample contained no legitimate controls or independently verified current labels. The results cannot establish false-positive rates or universal provider coverage. Test fresh, representative addresses before choosing a service.

Our DISIFY alternative guide compares signup workflows, pricing and the response changes to handle when migrating.

Can a GitHub blocklist replace a detection API?

A self-managed disposable-email-domains list provides local domain matching without a per-request API bill. It does not provide a hosted service or distinguish individual mailboxes on a shared domain. You own list imports, updates, corrections, and matching rules.

For an example of why imports need testing, issue #841 reports a Node.js line-splitting problem that produced an empty set. This is a reported integration problem, not proof that every current version is broken. Choose a local list when that operational responsibility and domain-level scope fit your application.

How should you test an API before choosing it?

Run each candidate against the same consented or otherwise appropriately handled test set. Separate known disposable addresses, legitimate mailboxes, custom domains, and inconclusive cases. Record the exact field used for the decision, request settings, and test date.

Measure latency from your application's region with realistic connection reuse. Include tail latency and timeout frequency, not only the median. A fast successful request says nothing about how your signup flow handles an unavailable dependency.

Implement three outcomes: disposable, not detected as disposable, and unavailable. If you allow signup during an outage, record that screening was skipped instead of inventing a clean result. If you pause signup, provide a retry path.

Which free disposable email checker API should you choose?

For a free disposable lookup, evaluate Kickbox API. For focused signup screening with a monthly allowance, evaluate IronDome. DISIFY offers core checks with a larger free allowance and additional detection signals. Abstract and Mailboxlayer are relevant when broader validation belongs in the same integration, subject to their plan limits and usage terms.

Choose using your application's failure policy and a representative test set. The largest free allowance is less useful than a decision your application can interpret correctly.