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Cold Email Personalizer
For outbound workflows and AI assistants

Relevant cold emails. Evidence behind every claim.

Turn a lead and your offer into a personalized email or opening lines, with supporting sources you can review. Start in the dashboard, then connect your assistant or API workflow.

Prepaid usage, $10 minimum top-up. You handle the sending.

API
Use it in your application or an HTTP workflow.
MCP
Connect a compatible assistant or agent client.
Lead
Dana Kowalski · Head of Operations, Lumen Freight
Offer
Warehouse picking software for third-party logistics providers

Illustrative example. The people, companies and sources are synthetic.

Subject

Rotterdam ramp-up

Hi Dana,

Saw that Lumen opened a second warehouse in Rotterdam and is hiring 40 associates for it. How are you keeping picking accuracy consistent as the Rotterdam team ramps up?

Select an underlined phrase to see the evidence behind it. Numbers match the evidence list.

Opening only. See the full email and every source.

Source for the selected claim

How cold email personalization works

Provide a lead and your offer. Receive writing with evidence you can review.

Illustrative example
  1. Step 01

    Identify the lead

    Add a LinkedIn URL, an email address, or a name and company domain.

    Example input
    Name: Dana Kowalski
    Company domain: lumenfreight.com
  2. Step 02

    Describe your offer

    Tell us what you sell and who it helps. Add more context when useful, or reuse a saved campaign.

    What you sellWarehouse picking software for third-party logistics providers
    Who it helpsOperations leads at 3PLs with two or more sites
  3. Step 03

    Receive writing with evidence

    Get a full email or opening lines, supporting evidence, and a clear outcome. Inspect the result before passing it to your sending workflow.

    Outcome
    Validated
    Opening
    “Lumen opened a second warehouse in Rotterdam”
    Source
    https://lumenfreight.com/news/rotterdam-site-opens

Follow the claim back to its source

Inspect what the email says, what supports it, and where the information came from. Review the reasoning before the email reaches your sending workflow.

Illustrative example. The people, companies and sources are synthetic.

To Dana Kowalski · Lumen FreightValidated
Subject

Rotterdam ramp-up

Hi Dana,

Saw that Lumen opened a second warehouse in Rotterdam and is hiring 40 associates for it. How are you keeping picking accuracy consistent as the Rotterdam team ramps up?

Northwind customers cut pick errors by 30% in their first quarter, and mid-size 3PLs go live in under two weeks.

Worth a 15 minute call next week?

Alex

Select an underlined phrase to see the evidence behind it. Numbers match the evidence list.

Claims about the offer come from the illustrative campaign and are labeled From you.

Public source
Information linked to a public page, with a supporting excerpt.
Data provider
Information returned by a data provider.
From you
Context or claims supplied in your offer or notes.
Inference
A conclusion drawn from available information, explicitly marked as uncertain.

A source shows where a claim came from. It does not guarantee the information is correct.

Sometimes the useful answer is no draft

If we cannot identify the right person, find enough evidence, or connect it credibly to your offer, the result explains what is missing.

Validated
Writing that passed the product’s factual and format checks against the available evidence. Not a guarantee of accuracy, so review the sources.
No evidence
The available information was insufficient to support a personalization.
No relevant angle
Evidence was found, but no credible connection to the offer.
Identity unresolved
The intended person could not be identified confidently.

No charge when we cannot produce a validated personalization. Failed runs are also uncharged.

Use your assistant. Or use your code.

Once a lead looks right in the dashboard, add personalization to your existing workflow through MCP or the API. Either path works on its own.

Connect your assistant

Research a lead and create a personalization from an MCP-compatible assistant.

Example request to your assistant
“Create a short opening for this lead using my saved campaign, and show me the supporting evidence.”
Connect an assistant

Supported clients connect through browser sign-in.

Call the API

Add cold email personalization to your application or an HTTP step in your automation workflow.

curl https://coldemailpersonalizer.com/v1/personalize \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "lead": {
      "name": "Jordan Lee",
      "company_domain": "example.com"
    },
    "offer": {
      "what_you_sell": "Warehouse picking software",
      "who_it_helps": "Operations leads at multi-site 3PLs"
    },
    "output_format": "full_email"
  }'

# → the run (status "completed") or, after the wait window, { "run_id": "...", "status": "queued" }

Set up your offer once. Reuse it across leads.

A campaign is your saved offer and writing settings: what you sell, who it helps, tone and output format. Reference it in later requests instead of repeating the context. Campaigns do not send email.

Campaigns are optional. You can also include your offer directly in each request.

Northwind Q4 outboundIllustrative example
What you sell
Warehouse picking software for third-party logistics providers
Who it helps
Operations leads at 3PLs with two or more sites
Tone
Direct
Output format
Email

Prepaid usage. Pay only for validated results.

Add funds when you are ready to run. An operation is charged only when its result passes the product’s checks. Failed or empty results cost nothing.

Each price applies only to a validated result.
OperationPriceCharged when
PersonalizationA full email or opening lines, with evidence.$0.22Charged when the email or opening lines pass validation.
Research onlyEvidence about a lead, without writing.$0.10Charged when research returns usable evidence.
Offer refinementTurns a rough offer description into campaign fields.FreeFree.
  • $10 minimum top-up
  • No subscription
  • Purchased balance does not expire
  • No free credits
  • Requests require sufficient available funds

Questions

Access and billing

Results and evidence

The product

Bring a lead. See what supports the message.

Add a lead and your offer in the dashboard. Generate a personalization and review the evidence behind it.

Prepaid usage. $10 minimum top-up. You handle the sending.