Verifly vs mailboxlayer
mailboxlayer is a classic single-request validation API. Verifly is a pay-as-you-go verification API built for bulk and AI agents.
mailboxlayer, part of the apilayer family, is a long-standing REST API for real-time email address validation: syntax, MX, SMTP, free and disposable checks returned as a simple JSON response. If you are integrating a single field-level check into a form, it does the job. Where teams start looking for an alternative is volume and workflow: mailboxlayer is priced in monthly request tiers, and cleaning a large list or wiring verification into an autonomous agent is not its core use case. This page maps the two APIs field by field, shows the same check in curl, Node and Python, and is honest about where each fits. Always confirm mailboxlayer's current pricing on their site before you decide — plans and limits change.
Pricing Comparison
| Volume | Verifly | mailboxlayer | You Save |
|---|---|---|---|
| 2,000 | 100 free + $10 pack (5k credits) | Check current mailboxlayer plan | Pay-as-you-go, no subscription |
| 5,000 | $10 pack (5k credits) | Check current mailboxlayer plan | Credits never expire |
| 25,000 | $37 pack | Check current mailboxlayer plan | No monthly lock-in |
| 100,000 | $99 pack | Check current mailboxlayer plan | $0.99 / 1k |
| 1,000,000 | $599 pack ($0.60/1k) | Check current mailboxlayer plan | Volume rate |
Competitor prices can change. Enter a current quote in the calculator before making a pricing decision.
Open cost calculatorFeature Comparison
| Feature | Verifly | mailboxlayer |
|---|---|---|
| Real-time single verification | ||
| Syntax + MX check | ||
| SMTP check | ||
| Disposable email detection | ||
| Free-provider detection | ||
| Role account detection | Partial | |
| Catch-all detection | Limited | |
| Async bulk API (up to 1M) | ||
| CSV list cleaning | ||
| Pay-as-you-go (no monthly plan) | ||
| Credits never expire | ||
| Hosted MCP server (AI agents) | ||
| Autonomous agent self-registration | ||
| Crypto payments |
Why Choose Verifly
- Pay-as-you-go credits with no monthly subscription — credits never expire
- Async bulk API and CSV cleaning for large lists, not just single lookups
- Dedicated catch-all and role flags in every response
- Agent-native: hosted MCP server, self-registration, crypto billing
- 100 free credits to test with no card
Where mailboxlayer Wins
- Simple, well-documented single-request API that is easy to drop into a form
- Part of the established apilayer ecosystem with other data APIs
- Fixed monthly tiers can be predictable for steady, low-volume usage
mailboxlayer Drawbacks
- Monthly request-tier pricing rather than pay-as-you-go credits
- Built around single real-time lookups — large-list cleaning is not its focus
- No native tooling for AI agents (no MCP server or autonomous signup)
The Verdict
If you need a single field-level check inside a signup form and you are comfortable on a monthly plan, mailboxlayer is a reasonable, mature choice. If you are cleaning lists in bulk, want to pay only for what you verify, or need an email check an AI agent can call on its own, Verifly is the better fit: async bulk, pay-as-you-go credits that never expire, and a hosted MCP server — with the same core syntax, MX, SMTP, disposable and catch-all signals in one response.
Frequently asked questions
Is Verifly a drop-in replacement for mailboxlayer?
For the common case — verify one address, read back syntax, MX, SMTP, disposable, role and catch-all — yes. Verifly returns the same signals from a single GET /api/v1/verify?email= call with a Bearer key, plus a dedicated catch-all flag and a deliverability verdict.
How does the pricing model differ?
mailboxlayer uses monthly request tiers. Verifly is pay-as-you-go: you buy credit packs (from $10 for 5,000, down to $0.60 per 1,000 at volume), credits never expire, and there is no monthly fee. You pay for verifications you actually run.
Can I verify a large list?
Yes. Verifly has an async bulk API for up to 1,000,000 addresses and CSV list cleaning, which is aimed at list hygiene rather than one-off form checks.
Does Verifly work with AI agents?
Yes — it has a hosted MCP server, autonomous self-registration (an agent can get its own key and 100 free credits with no human), and crypto billing. That is the main workflow difference versus a classic real-time validation API.
How accurate is catch-all detection?
Verifly runs a live SMTP probe and returns an explicit is_catch_all flag on every result, so accept-all domains are labeled rather than silently promoted to valid. You can try it free on the catch-all email verifier tool.
Same check, three languages
Verifly returns a JSON body with is_valid, result (deliverable / risky / undeliverable), and a details object holding syntax_valid, mx_records, smtp_valid, is_disposable, is_role_account, is_catch_all, is_free_provider and provider. curl: curl -H "Authorization: Bearer vf_key" "https://verifly.email/api/v1/verify?email=name@example.com". The Node and Python calls are a single fetch/requests.get against the same URL — see the developer docs for copy-paste snippets.
When mailboxlayer is the better choice
If your entire need is a single synchronous validation inside a web form, you already run on a monthly plan that fits your volume, and you have no interest in bulk cleaning or agent workflows, mailboxlayer is a perfectly solid, mature option and switching buys you little. This comparison is meant to be honest about that.
Ready to switch?
Start verifying emails at half the cost. No credit card required.