Warmy API

Key points

• Category: Deliverability & warm-up
• Pricing: Paid
• Best for: Agencies and platforms managing deliverability at scale.
• Full REST coverage
• Automation-platform friendly
• Included in every plan

What Warmy API is

The Warmy API exposes warm-up, placement testing, verification and reporting programmatically, so deliverability can be built into your own product or internal tooling.

Agencies use it to provision and monitor mailboxes for many clients; product teams use it to verify addresses at signup and to surface placement data inside their own dashboards.

It sits in the deliverability & warm-up part of an email stack - build and repair sender reputation before volume ramps. In practice it is the right pick when your priority is: agencies and platforms managing deliverability at scale.

What it does well

The capabilities teams rely on most are full rest coverage, automation-platform friendly, included in every plan. Taken together these cover the day-to-day work in this category, and they are the features worth testing during a trial rather than reading about.

Warm-up, seed placement, verification and DMARC data are available through one API rather than four vendor integrations.

In real use the strongest points people report are no extra vendor for automation; good fit for multi-client operations.

Key features

• Full REST coverage
• Automation-platform friendly
• Included in every plan
• No extra vendor for automation
• Good fit for multi-client operations

Pricing tiers

Warmy API is a paid product. Full API access is included on every Warmy plan.

Pricing pages move often, so confirm the current figures with the vendor before you budget. The number worth modelling is not the licence fee on its own but the cost per delivered email once bounces, suppressed contacts and spam-foldered sends are taken out.

Ideal customer profile

• Best fit: Agencies and platforms managing deliverability at scale.
• Where it sits in the stack: Deliverability & warm-up - build and repair sender reputation before volume ramps.
• Budget profile: Paid - suited to teams comfortable with this commercial model.
• Probably not for you if: requires development time to integrate would block your team.

What it connects to

Warmy API is commonly wired into REST API, Webhooks, n8n, Zapier, Make, Custom internal tools and Agency dashboards. Check that the specific objects and events you rely on are covered, not just that a logo appears on the integrations page - shallow connectors are a frequent source of rework.

Where it falls short

No tool in this space is complete on its own. With Warmy API the trade-offs to plan around are requires development time to integrate. None of these are reasons to avoid it - they are the gaps another layer of your stack needs to fill.

It is an infrastructure product - getting value from it assumes you have engineering time to integrate and monitor it.

A useful test before committing: send a real campaign through your intended setup, then check where it actually lands across Gmail, Outlook, Yahoo and your customers' corporate filters. Tooling that looks identical on a feature list often behaves very differently once reputation and authentication are involved.

The essentials

Category

Deliverability & warm-up

Pricing model

Paid

Vendor

Warmy

G2 rating

4.9 / 5

Best for

Agencies and platforms managing deliverability at scale.

Works alongside Warmy

Part of the Warmy platform

Review scores are rounded public averages and change over time - treat them as indicative rather than exact.

How it fits a deliverability stack

Deliverability is decided by four things: the reputation of the sending domain and mailbox, the quality of the list, correct SPF, DKIM and DMARC authentication, and proof of where mail actually lands. Warmy API covers part of that picture. The mistake most teams make is buying four separate products for those four jobs and still having no single place that tells them whether the last campaign reached the inbox.

As a Warmy product, Warmy API shares the same reputation data, seed network and reporting as warm-up, inbox placement testing, email verification and DMARC monitoring - so the four jobs above stay in one view.

The API lets reputation, hygiene and placement checks run automatically in your own workflows instead of as manual tasks.