# Pretick
> Forecasting AI. Give it numbers. Get the next set.
Pretick forecasts chronological numeric time series through one API. Use it for sales, revenue, costs, pricing, and other evenly spaced numerical series.
- [API guide](https://pretick.ai/docs): authentication, limits, examples, errors.
- [OpenAPI](https://pretick.ai/openapi.json): machine-readable contract.
- [Full agent guide](https://pretick.ai/llms-full.txt): complete onboarding instructions.
- [Free trial and playground](https://pretick.ai/start): five free forecasts, key by email.
- [Pricing](https://pretick.ai/pricing): $0.02 per successful bounded forecast; $10 prepaid top-up.
API base: https://pretick.ai
POST /v1/trial; POST /v1/timeseries/forecast; GET /v1/usage.
Keep API keys private. Humans retrieve trial keys from email and complete any paid checkout.