Request API Access

Includes 100 forecast credits for testing. No credit card required. 1 forecast credit = 1 forecast request.

100 credits 1 credit = 1 forecast request x-api-key auth No credit card Instant
Please enter your full name.
Please enter a valid email.

How credits work

1 credit = 1 forecast request. Each API call to POST /api/v1/forecast uses one credit. Developer preview includes 100 forecast credits for testing — enough to test the endpoint, build a prototype, or forecast your first 100 campaigns. Credits do not expire. Buy credit packs from the pricing page when you need more.

Important notes

  • Use x-api-key header in your requests
  • Do not expose your key in browser-only JavaScript
  • 100 forecast credits for testing
  • No credit card required
  • Use in dashboards, proposal tools, CRMs, or internal calculators
  • 1 credit = 1 forecast request
  • Results are estimates, not guarantees
  • For higher limits, buy a credit pack

What you get

  • API key delivered instantly
  • 100 forecast credits for testing
  • ROI forecasts
  • Positive reply estimates
  • Booked call estimates
  • Performance grade
  • Risk flags
View API Docs

How it works

  • Fill in your name, email, and company
  • We generate a unique API key
  • Check your email and click the confirmation link
  • Your API key is revealed after confirmation
  • Use the x-api-key header in requests
  • 100 credits included

Upgrading to a paid credit pack

After purchasing a credit pack, your API key and credit balance are sent to your email within 1 business day. There is no separate account to create. View pricing to see available credit packs.

API endpoint

Make a POST request to:

https://www.coldmailcalculator.com/api/v1/forecast

Include your API key in the x-api-key header.

Frequently asked questions

How many credits do I get?
Developer preview includes 100 forecast credits for testing. 1 credit = 1 API call to POST /api/v1/forecast. Credits do not expire. Buy credit packs when you need more. View pricing.
Do I need a credit card?
No. Developer preview access does not require a credit card.
Is ColdMailCalculator an email sending tool?
No. ColdMailCalculator is a forecasting and ROI intelligence API, not an email sending, warmup, or lead database platform.
Can I buy more credits later?
Yes. Buy credit packs (one-time purchases) anytime on the pricing page. No subscription required.