Continuum
email verifier · transactional · nurture & newsletters · cold email · lead finder

Stop paying for
five email tools.

One platform for the whole email lifecycle: verify addresses, send transactional mail, run newsletters and nurture, work cold email sequences, and source new leads. Five separate subscriptions, five dashboards, five integrations — collapsed into one.

Live in 30 seconds · no card required · 1k free sends/mo

Five tools. One platform.
01
Email Verifier
12-layer · Bulk CSV · Continuous monitoring
02
Transactional
Templates · Batch · Verify-before-send
03
Nurture & Newsletters
Campaigns · Lists · Event-triggered automations
04
Cold Email
Sequences · Multi-mailbox · AI personalization
05
Lead Finder
Prospect search · CRM · Clay + Zapier connectors
12-layer
verification engine
5 tools
replaced by one platform
30 sec
to your first send
$0
to start · no card required
Email Verifier

12 checks. One verdict.
Measured, not asserted.

Verify one address in real time, scrub a whole list via CSV, or check inline at send time withverify_before_send: true. Continuum also does the sending — so the accuracy number in your dashboard comes from real bounce outcomes, not a confidence score we made up.

Real-time lookupBulk CSV uploadInline verify-before-sendContinuous re-verificationStatus-change webhooks
Start verifying free →
POST /v1/verify
{ "email": "alex@acme.com" }
200 OK
{
  "result": "deliverable",
  "score": 94,
  "mx_found": true,
  "smtp_valid": true,
  "is_disposable": false,
  "is_role": false,
  "is_catch_all": false,
  "sub_status": "valid"
}
01
Syntax validation
RFC-compliant parsing — catches malformed addresses before any network call.
02
MX record check
Live DNS resolution — confirms the domain actually accepts mail.
03
SMTP probing
Mailbox-level handshake — verifies the specific address exists.
04
Catch-all detection
Flags accept-all domains that confirm every address regardless.
01
Syntax validation
RFC-compliant parsing — catches malformed addresses before any network call.
02
MX record check
Live DNS resolution — confirms the domain actually accepts mail.
03
SMTP probing
Mailbox-level handshake — verifies the specific address exists.
04
Catch-all detection
Flags accept-all domains that confirm every address regardless.
05
Disposable detection
Blocks throwaway providers like Mailinator and Guerrilla Mail.
06
Role account detection
Flags info@, support@, noreply@ — low deliverability by design.
07
Greylisting awareness
Handles temporary deferrals without false negatives.
08
SPF / DKIM / DMARC
Sender-auth record checks — surfaces misconfigured domains.
09
Domain blacklists
Cross-checks Spamhaus, Barracuda, and others in real time.
10
Subdomain spoofing
Catches look-alike domains used in phishing and typosquatting.
11
Score & confidence
0–100 deliverability score — act on a number, not a binary.
12
Continuous monitoring
Re-verify on schedule. Webhook fires the instant a verdict changes.
Transactional

Send fast.
Never send blind.

Every transactional sender looks the same until a bad address quietly tanks your SES reputation. Continuum checks the recipient inline, before the message ever leaves the server — so it never gets the chance.

01
Templates & variables
Reusable HTML or MJML templates with {curly} substitution, spintax and Liquid conditionals. Auto-compiled server-side.
02
Batch sending
POST /v1/send/batch — up to 100 messages, per-message suppression checks, shared quota enforcement.
03
Scheduled delivery
Set scheduled_at and the email queues via BullMQ — cancel anytime until it fires.
04
Open & click tracking
1×1 pixel + link wrapping injected automatically. Events in /v1/analytics.
05
Custom sending domains
DKIM keypair generated on domain creation. DNS records returned in the response.
06
Verify before send
Add verify_before_send: true to abort delivery to invalid addresses before SES ever touches them.
Start sending →
POST /v1/send
{
  "to": "alex@acme.com",
  "template_id": "welcome_v2",
  "variables": { "first_name": "Alex" },
  "verify_before_send": true,
  "scheduled_at": "2026-09-10T09:00:00Z",
  "track_opens": true,
  "track_clicks": true,
  "domain_id": "dom_acme"
}
200 OK
{
  "id": "msg_01j...",
  "status": "scheduled",
  "verified": true,
  "scheduled_at": "2026-09-10T09:00:00Z"
}
POST /v1/automations
{
  "name": "Trial expiry drip",
  "trigger_event": "trial.expiring",
  "steps": [
    { "delay_hours": 0,  "template_id": "trial_day0" },
    { "delay_hours": 48, "template_id": "trial_day2" },
    { "delay_hours": 96, "template_id": "trial_day4_cta" }
  ]
}
200 OK
{
  "id": "auto_01j...",
  "status": "active",
  "enrolled": 0,
  "trigger_event": "trial.expiring"
}
Nurture & Newsletters

Newsletters and drip flows.
No PHP box to babysit.

Mailing lists, segments, double opt-in, one-click unsubscribe — plus drip automations that fire the moment your app tells them to. Sends fan out 50 recipients at a time, paced to stay under SES quotas without you thinking about it.

01
Mailing lists + segments
Segment contacts by field values, subscription date, or open behaviour for targeted blasts.
02
Newsletter campaigns
One-time or scheduled broadcast emails with A/B subject testing, spintax, and live stats.
03
Event-triggered automations
POST /v1/automations/trigger from your app — contacts enter a timed multi-step drip automatically.
04
RFC 8058 one-click unsubscribe
List-Unsubscribe header auto-injected on every send. Gmail compliance out of the box.
05
Double opt-in
GDPR-ready confirmation flow — Continuum sends the confirmation email, you handle nothing.
06
Suppression on every send
Every recipient re-checked against the global suppression list before each campaign step.
Start nurturing →
Cold Email

Sequences that write themselves.
And know when to stop.

Build sequences that mix email, LinkedIn touchpoints, and manual tasks. Connect multiple mailboxes and rotate sends across them for reputation spread. AI writes the opening line per lead — and a real reply, not a bounce, pauses enrollment on its own.

AI sequence generation
One brief → a full sequence plan: email copy, LinkedIn steps, and task notes, ready in seconds.
Multi-mailbox rotation
Connect SMTP, Gmail, Outlook. Rotate per-recipient for reputation spread and daily limit management.
Inbox warmup
Ramp-up from 5 → 40 emails/day over 30 days to build sender reputation before cold campaigns.
AI first-line writer
Claude writes a personalised opener per lead using their company, title, and context — at enrollment.
Reply detection (IMAP)
Worker polls every 15 min. A matched reply pauses or stops enrollment automatically.
AI reply classification
Inbox auto-classifies: interested, meeting request, OOO, unsubscribe — with a suggested next action.
Conditional steps
if_not_opened, if_not_replied — skip irrelevant follow-ups without manual review.
Unified inbox
All replies across every connected mailbox in one view, with sequence and enrollment context.
POST /v1/ai/generate-sequence
{
  "icp_description": "Series A SaaS founders, 10-50 employees",
  "goal": "Book a 15-min demo",
  "tone": "direct",
  "num_steps": 5
}
200 OK
{
  "sequence_name": "Series A Founder Outreach",
  "steps": [
    { "step_order": 1, "type": "email", "delay_days": 0,
      "subject": "Quick thought on your onboarding...",
      "html_body": "<p>Hi {{first_name}}, saw you recently raised..." },
    { "step_order": 2, "type": "linkedin", "delay_days": 3,
      "task_note": "Connect + comment on their latest post" },
    { "step_order": 3, "type": "email", "delay_days": 7,
      "subject": "Still relevant?", "condition": "if_not_replied" }
  ]
}
POST /v1/ai/classify-reply
{ "body": "Thanks for reaching out, would love to chat next week" }
200 OK
{
  "category": "meeting_request",
  "confidence": 0.95,
  "suggested_action": "reply"
}
Warmup progress
Day 1
5/day
Day 7
12/day
Day 14
24/day
Day 30
40/day
Lead Finder

Find, enrich, enroll.
Same afternoon.

Search prospects by job title, company, industry, and location, then drop them straight into an outbound sequence — no CSV export, no manual re-upload. AI writes a personalised icebreaker for each lead before enrollment even starts.

01
ICP-based search
Filter by title, seniority, company size, industry, and geography — the parameters that actually narrow a list.
02
Direct sequence enrollment
Import search results straight into a sequence. No intermediary CSV step.
03
AI lead enrichment
Claude generates an icebreaker, surfaces pain points, and notes relevant context per lead at import.
04
Lead CRM with activity timeline
Every send, open, click, and reply logged against each lead — full engagement history in one place.
05
Clay, Apollo & Zapier connectors
Webhook intake for Clay HTTP enrichment and Apollo exports. Generic field-mapper for Zapier, Make, and n8n.
Start finding leads →
POST /v1/finder/search
{
  "personTitleIncludes": ["Head of Growth"],
  "companyIndustryIncludes": ["Computer Software"],
  "personLocationCountryIncludes": ["United States"],
  "totalResults": 50
}
200 OK
{
  "runId": "0Fdhytba02fGr4OTu",
  "status": "running",
  "estimatedSeconds": 90
}

// then GET /v1/finder/jobs/{runId}/results
{
  "results": [
    {
      "firstName": "Jamie",
      "lastName": "Chen",
      "title": "Head of Growth",
      "company": "Acme Corp",
      "email": "j.chen@acme.com",
      "linkedinUrl": "linkedin.com/in/jamiechen",
      "emailStatus": "valid"
    }
  ]
}
POST /v1/finder/jobs/{runId}/import
{
  "emails": ["j.chen@acme.com"],
  "sequenceId": "seq_01j..."
}
200 OK
{
  "imported": 1,
  "skipped": 0
}
Why consolidate?

One bill instead of five.
One integration instead of many.

Every tool you add is another API key to rotate, another webhook to maintain, another dashboard to check. Continuum ships all five capabilities from a single endpoint with a shared contact model.

Capability
Best individual tool
Continuum
Email verification (12-layer)
Dedicated verifier ($29+/mo)
✓
Transactional sending
Dedicated sender ($20+/mo)
✓
Newsletter campaigns & automations
Self-hosted tool ($10+/mo)
✓
Cold outbound sequences
Dedicated sequencer ($39+/mo)
✓
Lead finder & prospect CRM
Dedicated prospecting tool ($49+/mo)
✓
Unified contact model
Siloed across 5 tools
✓
Single API key
5 separate integrations
✓
Estimated monthly cost (starter)
$147+/mo
$29
Get started free →

Competitor pricing based on public starter/base plans as of 2026.

Pricing

One plan covers all five tools.

Verify, send, nurture, prospect, and run outbound sequences — one price, no add-ons.

Free
$0Forever
1k verifications · 1k sends · 1 mailbox
  • ✓ 12-layer verification
  • ✓ Transactional email
  • ✓ Campaigns & lists
  • ✓ 5 monitors
  • ✓ API access
Start free
Most popular
Starter
$29/month
5k verifications · 5k sends · 5 mailboxes
  • ✓ Everything in Free
  • ✓ Cold outreach sequences
  • ✓ Lead finder
  • ✓ Inbox warmup
  • ✓ 50 monitors · Webhooks
  • ✓ Custom sending domains
Get Starter
Growth
$79/month
15k verifications · 15k sends · 25 mailboxes
  • ✓ Everything in Starter
  • ✓ AI first-line personalization
  • ✓ AI sequence generation
  • ✓ Inbox placement testing
  • ✓ 200 monitors
  • ✓ Priority support
Get Growth

Scale plan ($199/mo · 100k sends · 100 mailboxes · dedicated support) available in-app

all five pillars live

Stop paying for five tools.
Run all of it from one platform.

Live in 30 seconds. Verify, send transactionally, nurture your list, run cold outbound, and find new leads — all from the same platform.

Get started free →Read the docs

Or verify a single email for free →

Need something custom? Talk to an expert →