bolt Built for outbound SDR teams

The email finder built for SDRs who run quota every day

Stop bouncing between six tabs. Mailsfinder ships a 1 second REST API, 99% verified accuracy, and a flat $9.99 per month for 300,000 credits, so your SDRs stay inside Salesforce, HubSpot, Smartlead, or Instantly while pipeline gets built.

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No credit card. 100 free credits to test the API today.

POST /api/v1/find

{
  "first_name": "Sarah",
  "last_name": "Chen",
  "domain": "stripe.com"
}

200 OK  (842 ms)
{
  "email": "sarah.chen@stripe.com",
  "status": "verified",
  "confidence": 99,
  "smtp_check": "deliverable",
  "credits_used": 1
}

check_circle Delivered to inbox. Sequencer kept running.

timer 1s response

Trusted by outbound teams running quota at

Smartlead Instantly Clay Apollo Migrators Lemlist Reply.io

What SDRs use Mailsfinder for

Three workflows. One flat API.

Whether your SDRs work one prospect at a time or push 5,000 rows through Clay overnight, the same endpoint covers it.

person_search

Single prospect lookup

SDR drops a name and domain into the API call. Verified email returns in around 1 second. No tab switch, no Chrome extension popup blocking the screen.

database

Bulk list enrichment

Push a CSV of 10,000 prospects through the batch endpoint. Mailsfinder verifies each address before returning it, so your sequencer sees only deliverable inbox addresses.

api

Sequencer + CRM bridge

Wire Mailsfinder into Salesforce, HubSpot, Smartlead, or Instantly via Zapier or n8n. Lead lands in CRM, gets an email, goes into sequence, all without an SDR touching it.

How it works

Four steps from list to inbox

Push the prospect

SDR or workflow sends first name, last name, and domain to the API. That is the only required payload.

Multi-source resolve

Mailsfinder pings 47 data sources in parallel, picks the highest confidence pattern, and confirms it against the domain MX.

SMTP verify in flight

Every address runs through a live SMTP ping before delivery. Hard bounces, catch-all traps, and role aliases get flagged before they hit your sequencer.

Drop into stack

Response payload writes back to Salesforce, HubSpot, Clay, Smartlead, or Instantly. SDR opens their dashboard, sees a fresh queue.

Built for the SDR stack

No context switching. Ever.

SDRs already live inside Salesforce, HubSpot, Outreach, or a sequencer. The last thing they need is a seventh tab and a Chrome extension that nags them. Mailsfinder runs underneath the stack you already use.

check_circle

Clean REST API, no SDK lock-in

Standard JSON in, JSON out. Your RevOps engineer drops it into Zapier, n8n, Make, Clay, or a custom Cloud Function in under 30 minutes.
check_circle

Per-team seat economics

One $9.99 per month seat covers 300K credits, enough for a 50 SDR team running 100 prospects per day. No per-user multipliers.
check_circle

Verification baked in

Every address is SMTP verified before it leaves the API. Your sender reputation stays clean and your reply rates do not crash.
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Honest gaps

No Chrome extension yet and no native Salesforce or HubSpot apps. We are API-first by choice. Both are on the public roadmap.

A typical SDR day

Sales Navigator export to Clay

120 ICP-fit accounts queued

Mailsfinder API enriches all 120

Verified emails returned in 94 seconds. 119 deliverable, 1 risky flagged.

10a

Push to Smartlead sequence

Zapier bridge writes to CRM and triggers email 1

SDR runs discovery calls

Not finding emails. Not fighting a Chrome extension.

Stack economics

Apollo at $59 vs Mailsfinder at $9.99

Apollo bundles finder, sequencer, dialer, and intent data. If your team already runs Smartlead or Instantly for sending, you are paying twice. Mailsfinder is the finder layer alone.

$9.99

per month flat

300K credits included

API response

300ms on cached endpoint

99%

verified accuracy

SMTP checked in flight

85%

stack cost reduction

vs an all-in-one bundle

Cost line for a 10 SDR team	Apollo (bundle)	Hunter + sequencer	Mailsfinder + Smartlead
Email finder	included	$199 / mo	$9.99 / mo
Email verification	$49 / mo add-on	$99 / mo	included
Sequencer / sender	included	$94 / mo	$94 / mo
Per seat fee	$59 x 10 = $590	$49 x 10 = $490	$0
Total monthly stack	$639	$882	$104

Pricing pulled from public plans on the dates linked. Verify with each vendor before procurement.

REST API

The API your RevOps team actually wants

JSON in, JSON out. Token auth. Predictable rate limits. Webhook callbacks for bulk jobs. Drops into Salesforce flows, HubSpot workflows, Clay tables, Apollo migrations, and n8n pipelines without ceremony.

Zapier

Pre-built connector

n8n

Community node

Make

HTTP module ready

Clay

Custom action drop-in

curl -X POST https://api.mailsfinder.com/v1/find \
  -H "Authorization: Bearer $MF_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "first_name": "Sarah",
    "last_name": "Chen",
    "domain": "stripe.com"
  }'

# 200 OK in 842ms
{
  "email": "sarah.chen@stripe.com",
  "status": "verified",
  "confidence": 99,
  "smtp_check": "deliverable",
  "credits_used": 1,
  "credits_remaining": 299847
}

Pricing

One flat plan for your whole SDR team

No per-seat pricing. No verification add-ons. No quarterly contract.

Starter

$9.99

per month, flat

check300,000 credits per month
checkVerification included
checkREST API + bulk endpoint
checkUnlimited team members

Start free trial

Monthly

Built around the SDR org chart

trending_up

SDR managers

Buy one $9.99 seat. Cover the whole team. Track API usage per SDR via the dashboard, not per-seat invoices.

contact_phone

Individual SDRs / BDRs

Stay inside Salesforce, HubSpot, or Outreach. Mailsfinder runs in the background via the API, so quota gets hit faster.

settings

RevOps engineers

Wire the REST API into Clay, n8n, or custom Cloud Functions. Webhook callbacks make bulk jobs clean.

groups

Sales agencies

Run multiple client books on one seat. Tag credits by workspace and bill clients with clean per-prospect cost.

Keep going

Alternative

Mailsfinder vs Apollo.io

Finder-only at $9.99 vs the $59 bundle.

Alternative

Mailsfinder vs Hunter.io

Verification included, flat-rate credits.

Stack pairing

Mailsfinder + Smartlead

Finder + sender for under $105 a month.

Stack pairing

Mailsfinder + Instantly

Verified inbox lookups before send.

Guide

Email finders for LinkedIn prospecting

How we tested the tools SDRs actually use.

Free tool

Email finder

100 free lookups. No card.

Free tool

Email verifier

SMTP check any address in real time.

FAQ

SDR questions, answered

Does Mailsfinder have a Chrome extension for LinkedIn? expand_more

Not yet. Mailsfinder is API-first, so SDRs typically push LinkedIn URLs into the API via a Zapier or n8n bridge from Sales Navigator exports, PhantomBuster, or Clay. A native Chrome extension is on the public roadmap for late 2026. If a single-click LinkedIn extension is a hard requirement today, Apollo or Hunter cover that surface.

How fast is the API for an SDR running quota? expand_more

Single email lookups return in roughly 1 second on the standard endpoint and around 300 milliseconds on the cached endpoint. That speed matters when an SDR is running 80 to 120 prospects per day through a sequencer and cannot wait on batch jobs.

How does it integrate with Salesforce and HubSpot? expand_more

Mailsfinder does not ship native Salesforce or HubSpot apps yet. Most SDR teams connect via Zapier, n8n, or Make, which gives clean two-way sync to Salesforce, HubSpot, Pipedrive, and Outreach. The REST API also drops cleanly into custom RevOps scripts and Clay tables.

What does 300K credits actually buy an SDR team? expand_more

At $9.99 per month, 300,000 credits costs about $0.000033 per email lookup. A typical SDR running 100 prospects per day uses around 2,200 credits a month, which means one $9.99 seat can serve a team of 130 SDRs at full pace before topping up. Most 5 to 15 SDR teams run on a single seat.

How does Mailsfinder compare to Apollo for SDRs? expand_more

Apollo is a bundle at $59 per seat per month covering finder, sequencer, dialer, and intent data. Mailsfinder is the finder layer only at $9.99 per month flat. SDR teams that already use Smartlead or Instantly for sending typically pair them with Mailsfinder to cut total stack cost by 70 to 85 percent.

Is verification included or a separate cost? expand_more

Every email returned by Mailsfinder is SMTP verified before delivery, no extra credits charged. Most competitors price verification as a separate line item, which can double the true cost per usable email for an SDR running cold outbound.

Give your SDRs back the 6 tabs

100 free credits. No card. Drop the API into your stack and watch your sequencer fill itself.

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