Postio pricing: email verification API

Postio's site llms.txt Email validation API: 180+ verification providers compared Postio: email verification API alternatives

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33% complete: 2 of the 6 key fields we checkSee the 6 fields

$0.00per 1,000 emailsIn our email verification API benchmark, the best plan from Postio scores 0.0 out of 100. Postio ranks 167th of 181 providers.This plan is free. We rank 3,753 plans for email verification APIs by price. Half the plans cost $1.98 per 1,000 emails or less.treg's top-up from $10 is the cheapest paid plan per 1,000 emails: $0.00 on average. treg asks one provider after another until one answers. You pay $68.365 per 1,000 emails when no provider answers.Disify's $9 monthly plan (/email) covers any number of emails. Disify's $9 monthly plan costs less up front than treg's top-up from $10.MailTester Ninja, Enrich.so and GetProspect are the best email verification API providers in the Datacircle benchmark.

Plan: 100 free lookups one of Postio's 2 plans

Call: GET /email/{address} Postio's only call for this API

GET /email/{address}Free$0.00 per 1,000

API: Email verification API one of Postio's 2 APIs

About this item

Stored. Postio may answer from Postio's stored data instead of asking the mail server. Postio doesn't say how old the data is.
2 of the 6 key fields we check. Address, Deliverability.
Nothing to pay. You get 100 requests.
One call. You send address to GET /email/{address}. The call returns whether the address takes mail.
Anyone can get it. Keep data: no limit. Use data: with conditions.

Postio: email verification API alternatives

Postio alternatives: every email verification API provider ranked

The table starts with Postio's cheapest paid plan. Next come plans from other providers with the price per 1,000 emails closest to Postio's. Each plan in the table gives stored data.

	Postio, top-up from £10	SendPulse, $61 pack, Pay As You Go 5,000, POST /verifier-service/send-single-to-verify/	Byteplant, $661 monthly, Monthly, 50,000 credits, GET /api/verify	TrustPath, €50 monthly	DaData, ₽1,190,000 yearly
$ per 1,000 emails	$13.335	$12.20	$13.22	$14.066	$14.207
Completeness	33%	33%	17%	67%	33%
Billing	pay first	pay first	monthly	monthly	yearly
Pay	£10	$61	$661	€50	₽1,190,000
Enough for	as many as you pay for	5,000 calls	50,000 calls a month	4,000 calls a month	1,000,000 calls a year
Freshness	stored	stored	stored	stored	stored
Who can get it	anyone	anyone outside Russia	businesses and professionals with a business email	any legal entity, partnership, or sole proprietorship acting in the course of their commercial or professional activity	companies that can't work under DaData's offer (their lawyers disagree with its terms, or an NDA must be signed)

Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-03.

Product details

The key fields this plan's answer can hold, then each filled column in its row on the sheet.

Address
Deliverability
Confidence, not in the answer
Name, not in the answer
Place, not in the answer
Company, not in the answer

Price
$ per 1,000 emails	$0.00
Per	call
Billing	free

Aggregators
Aggregators	none

Not found
$ per 1,000	$0.00

In their words
Their pitch	Postio email validation goes past a regex: it checks syntax, resolves MX records and runs a live SMTP probe, then rolls the signals into one deliverability verdict — with flags for disposable, role and free-provider addresses.

Data
Freshness	stored
What it checks	format, mail servers, disposable domains, role addresses
Keep data	no limit
Use data	Don't use the API for fraud, spam targeting, stalking, harassment, or anything that breaks UK law. Because the address service uses Royal Mail PAF data, you must also keep to the PAF End User Terms — in particular, don't copy, extract, resell, republish or publicly display PAF data except as those terms allow, don't use it to build a competing product, and don't try to reverse-engineer the underlying data files. Don't use automated means to scrape or bulk-harvest responses beyond your purchased lookups.

Plan
Pay	$0
You get	100 requests
Enough for	100 calls

Rate limit
Per second	30
Batch	1

Speed
Answer	in the call

The call
You send	address
Method	GET
Path	/email/{address}

About the plan
Plan	100 free lookups
Who can get it	anyone

The 15 fields the plan's answer can hold

success, email address, valid syntax, did you mean, disposable, free provider, role account, MX found, SMTP check, catch-all, deliverability, result count, request ID, worker time, lookup time