Datacircle

Mails.so: 4 email validation API plans

Mails.so's sitellms.txt
67% complete: 4 of the 6 key fieldsSee which
$0.00per 1,000 emails
Plan: Free one of Mails.so's 4 plans
Call: GET /validate one of Mails.so's 2 calls

About this item

  • Freshness. Mails.so doesn't say how fresh an answer is.
  • 4 of the 6 key fields. Address, Its check, Confidence, Company.
  • Nothing to pay. You get 50 credits, enough for 50 calls.
  • One call. You send email to GET /validate. The call returns whether the address takes mail.
  • Anyone can get it. Keep data: no limit. Use data: any.

Compare with similar plans

Other providers' plans with the closest prices per 1,000.

This planMails.so, freeMelissa, free, Monthly Top-off, GET /V4/WEB/GlobalEmail/doGlobalEmailMinelead, freeMailValidation.io, free, Free, POST /api/validate/MyEmailVerifier, free, 100 free credits daily, GET /verifier/validate_single/{email}/{API_KEY}
$ per 1,000$0.00$0.00$0.00$0.00$0.00
Completeness67%50%50%33%33%
Billingfreefreefreefreefree
Pay€0$0$0$0$0
Enough for50 calls250 calls a month25 calls a month100 calls100 calls a day
Freshnessnot publishedlivelivelivelive
Who can get itanyoneanyone who pays the "$4.97 Verification Fee (One-Time)" (a KYC/AML identity check), after it Melissa tops off up to 1,000 free credits a monthanyoneanyoneanyone who verifies a phone number

Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-20.

  1. docs.mails.so/bulk
  2. docs.mails.so/intro
  3. docs.mails.so/response
  4. docs.mails.so/single
  5. mails.so
  6. mails.so/privacy
  7. mails.so/terms

Product details

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

  • Address
  • Its check
  • Confidence
  • Name, not in the answer
  • Place, not in the answer
  • Company
Price
$ per 1,000$0.00
Billingfree
Aggregators
Aggregatorsnone
Charges
Percall
Also pays fornothing else
Not found
$ per 1,000$0.00
In their words
Their pitchEmail Validation API: Clean Lists, Boost Deliverability & Maximize ROI. Remove fake emails and spam users from your email lists.
Data
Keep datano limit
Use dataany
Plan
Pay€0
You get50 credits
Enough for50 calls
Rate limit
Batch1
Speed
Answerin the call
The call
You sendemail
MethodGET
Path/validate
About the plan
PlanFree
Who can get itanyone
The 16 fields the plan's answer can hold

id, email, username, domain, MX record, score, valid format, valid domain, valid MX record, not blocked, no catch-all, not generic, free email provider, result, reason, error