> For the complete documentation index, see [llms.txt](/llms.txt).
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- marketing
12 endpoints

# Marketing API

Same bearer token, same credit pool, same JSON envelope as every other endpoint — drop them into apps, sites, workflows, or agents without rebuilding formulas, validation, or docs.
[Start free →](/billing/checkout/?plan=free) [View OpenAPI](/v1/docs) [All categories](/tools/)
Advertising
[
CTR Calculator ctr-calculator
Calculate click-through rate, required clicks for a target CTR, or bulk campaign CTR.
1cr · v2026-04-22
](/tools/ctr-calculator/)
Email
[
Email Open Rate Calculator email-open-rate-calculator
Calculate email delivery rate and open rate from campaign counts.
1cr · v2026-04-22
](/tools/email-open-rate-calculator/) [
Unsubscribe Rate Calculator unsubscribe-rate-calculator
Calculate campaign unsubscribe rate and subscriber-list loss rate.
1cr · v2026-04-22
](/tools/unsubscribe-rate-calculator/)
Funnels
[
Conversion Rate Calculator conversion-rate-calculator
Calculate conversion rate from visitors and conversions.
1cr · v2026-04-22
](/tools/conversion-rate-calculator/)
ROI
[
Social Media ROI Calculator social-media-roi-calculator
Calculate social media campaign ROI, ROAS, conversion rate, and unit costs.
2cr · v2026-04-22
](/tools/social-media-roi-calculator/)
Retention
[
Churn Rate Calculator churn-rate-calculator
Calculate churn, retention, ending customers, and net customer growth.
1cr · v2026-04-22
](/tools/churn-rate-calculator/)
SaaS Metrics
[
ARPU Calculator arpu-calculator
Calculate ARPU for a period plus monthly and annualized ARPU.
1cr · v2026-04-22
](/tools/arpu-calculator/)
Surveys
[
Net Promoter Score Calculator net-promoter-score-calculator
Calculate NPS from promoter, passive, and detractor counts.
1cr · v2026-04-22
](/tools/net-promoter-score-calculator/)
Unit Costs
[
Cost Per Lead Calculator cost-per-lead-calculator
Calculate cost per lead and optional funnel metrics.
1cr · v2026-04-22
](/tools/cost-per-lead-calculator/)
Unit Economics
[
Customer Acquisition Cost Calculator customer-acquisition-cost-calculator
Calculate CAC from marketing spend, sales spend, and new customers.
1cr · v2026-04-22
](/tools/customer-acquisition-cost-calculator/) [
Customer Lifetime Value Calculator customer-lifetime-value-calculator
Estimate LTV from order value, purchase frequency, gross margin, and lifespan.
1cr · v2026-04-22
](/tools/customer-lifetime-value-calculator/) [
Customer Lifetime Value (CLV) Calculator customer-lifetime-value-clv-calculator
Customer lifetime value from ARPU, gross margin, and retention rate via a discounted-perpetuity model, with CLV:CAC health rating.
1cr · v2026-04-22
](/tools/customer-lifetime-value-clv-calculator/)
API OPERATIONAL v1 · OpenAPI 3.1 · MCP 2025-06-18
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