Cold Email Writer

cold-email-writer

Write B2B cold emails and follow-up sequences that sound like a sharp human and earn replies.

Pricing & runtime

Current price: 25 Credits per run
Timeout: up to 900s
Brand Context: Optional — pass a brand_context_id

Prices are calibrated against real run costs and may change — the credit_cost returned when creating a run is authoritative.

Input parameters

Pass these under the input object of POST /api/v1/runs.

Key	Type	Required	Label & description
product_description	short_text	Required	ProductWhat the product is.
target_role	short_text	Required	Writing toRole, company type, why them.
value_proposition	short_text	Optional	Problem you solveThe specific problem for people like them.
proof_points	long_text	Optional	Proof pointA result, case, or credibility signal you hold.
research_signals	long_text	Optional	Prospect signalsYour own notes: funding, hiring, posts, tech changes.
cta_goal	select	Optional	AskWhat a reply means.Options: Interest check, Meeting, Introduction
sequence_emails	select	Optional	Sequence lengthTotal touches.Options: 3 emails, 4 emails, 5 emails
sender_context	short_text	Optional	SenderWho signs it.
interaction_language	select	Optional	Report languageControls the language of the generated report.Options: English, Chinese

Request example

Covers every required field. Optional fields follow the same pattern.

curl -X POST https://api.TODO-APP-DOMAIN/api/v1/runs \
  -H "Authorization: Bearer $SUPAMARKETERS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "app_slug": "cold-email-writer",
  "input": {
    "product_description": "example text",
    "target_role": "example text"
  }
}'

What you get back

A 201 response returns run_no, credit_cost, stream_url and result_url (relative paths). Stream progress from stream_url and fetch the terminal result — summary and output — from result_url. Results stay available for the App's retention window (30 days by default).