Pay as you go email marketing: how credit pricing compares to subscriptions

Most email platforms price in one of three ways: by contacts stored, by emails sent each month, or by prepaid credits you spend as you go. None is cheaper for everyone. The right model depends on your list size, how often you actually send, and how predictable your year is.

Below: each model, who it suits, an illustrative calculation, and questions to ask any provider.

The three common pricing models

1. Monthly subscription priced by stored contacts

You pay a recurring fee based on the number of contacts in your account, usually in tiers. Sending is often unlimited or capped at a generous multiple of your list size.

• What you are really paying for: the size of your audience, every month, whether you email it or not.
• Hidden cost to watch: unsubscribed, bounced and inactive contacts may still count toward your tier on some platforms. Check how "billable contacts" are defined.

2. Monthly subscription priced by sends

You pay for a monthly allowance of emails, regardless of how many contacts you store. Unused sends typically reset at the end of each billing period.

• What you are really paying for: a sending capacity you commit to in advance.
• Hidden cost to watch: overage fees if you exceed the allowance, and wasted allowance in quiet months.

3. Prepaid credits (pay as you go)

You buy a block of credits up front and spend them as you use the service. There is no recurring fee; when the balance runs low, you top up.

• What you are really paying for: actual usage.
• Hidden cost to watch: whether credits have a validity period, and whether a single credit covers the same unit of work across features.

Side-by-side comparison

Who each model suits

Contact-based subscriptions suit high-frequency senders

If you email the same moderate-sized list several times a week, paying for list size with generous sending included is usually efficient. The more you send per contact, the lower your effective cost per email.

Send-based subscriptions suit steady, predictable volume

If you send roughly the same number of emails every month, an allowance that matches your volume is easy to budget. It becomes less attractive when volume swings.

Prepaid credits suit irregular and seasonal senders

Pay as you go email marketing tends to fit:

• Seasonal businesses that send heavily around a few peaks (holiday retail, tax season, tourism, back to school) and barely at all in between.
• Irregular senders such as nonprofits, event organizers and B2B companies that send a quarterly update or a handful of announcements a year.
• Agencies and freelancers who run campaigns for clients in bursts and do not want a subscription sitting idle between projects.
• Large lists with low send frequency, where paying monthly for tens of thousands of stored contacts makes little sense if you email them a few times a year.
• Teams that verify lists as well as send, if the provider lets one balance cover both.

An illustrative worked example

The numbers below are illustrative round numbers, not real prices from any provider. The point is the arithmetic, which you can redo with your own figures.

Imagine a business with 20,000 contacts that sends 4 campaigns a year (one per quarter), and wants to verify the list once before the first send.

Step 1: count the sends.

4 campaigns × 20,000 contacts = 80,000 sends per year

Step 2: add verification.

Verifying the list>20,000 verifications

Step 3: total the usage.

80,000 sends + 20,000 verifications = 100,000 units of work per year

On a credit model where 1 credit covers 1 send or 1 verification, this business needs 100,000 credits a year, bought whenever it needs them.

Now compare how the same business would be billed on a subscription:

• Contact-based: it pays for a 20,000-contact tier for 12 months, even though it only sends in 4 of them. That is 8 months of fees for no sends.
• Send-based: its monthly allowance would need to cover 20,000 sends in a campaign month, then sit mostly unused for the other two months of each quarter.

To compare fairly, take each provider's real quote and calculate your effective cost per email actually sent over a full year:

Effective cost per email = total annual cost ÷ total emails actually sent

Run the same calculation for a busier scenario too. If the business grew to weekly newsletters (52 × 20,000 = 1,040,000 sends a year), the answer could flip in favor of a subscription. Model your own pattern rather than relying on a general rule.

Sanity checks for your own calculation

• Use your real send frequency from the last 12 months.
• Subtract contacts you should not be emailing (unsubscribed, bounced, long-term inactive).
• Include verification if you import lists from events, partners or old CRMs. See how to verify an email list.

How InboxRoads credits work

InboxRoads uses prepaid credits with no monthly subscription. The model is deliberately simple:

• 1 credit = 1 email verification or 1 email send. There is one balance for both, so you do not need separate plans for email verification and email marketing.
• Credits are reserved when a job starts. The credits a campaign or verification job may need are set aside so it cannot run out halfway.
• Credits are consumed as work completes. Each completed verification or send uses its credit.
• Unused credits are returned automatically. If you cancel a job, or addresses are skipped because they are suppressed (unsubscribed, hard-bounced, complained) or duplicates, the reserved credits go back to your balance.
• Duplicates and malformed addresses are removed before verification and are not charged.
• Packages range from 50,000 to 1,000,000 credits. Current packages, and any validity period attached to them, are listed on the pricing page.

In the illustrative example above, the business would buy a package that covers its 100,000 credits, spend 20,000 on verification, and draw down the rest one campaign at a time.

Questions to ask any provider before choosing

Get clear answers to these before you commit:

1. What exactly is billed? Stored contacts, sends, credits, or a mix? Are unsubscribed or bounced contacts counted?
2. What happens in a quiet month? Do you still pay, and does unused allowance roll over or disappear?
3. What happens in a busy month? Overage fees, forced upgrades, or simply buying more?
4. Do credits or allowances expire? If so, after how long, and is that stated before purchase?
5. Is verification included, separate, or charged on a different unit?
6. Are you charged for skipped addresses? Suppressed contacts, duplicates and syntax errors should ideally cost nothing.
7. What happens to reserved or prepaid usage if you cancel a campaign?
8. Are sending domain authentication and tracking domains included? Proper SPF, DKIM and DMARC setup matters more to deliverability than any pricing model.
9. Can you export your contacts and data at any time without a fee?
10. Is there a trial or small starting balance so you can test deliverability and the editor before committing?

Key takeaways

• Contact-based pricing charges you for audience size; send-based pricing charges for committed volume; credits charge for actual usage.
• Pay as you go email marketing usually fits seasonal, irregular and low-frequency senders best, while very frequent senders to a stable list may do better on a subscription.
• Always compare on effective cost per email actually sent over a full year, using your real sending history.
• If a single balance for verification and sending suits you, you can create an InboxRoads account and review packages on the pricing page.