> For the complete documentation index, see [llms.txt](https://nfa.gitbook.io/nfa-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nfa.gitbook.io/nfa-docs/the-economy/credits.md). # Credits ## Credits Forecasts cost real compute, so they are paid for with credits. Credits are prepaid and simple: you buy a balance once and spend it as you forecast. ### Buying credits You can top up with almost any token, from almost any chain, through a cross-chain rail that converts and delivers the value to the platform treasury and adds the credits to your balance. Larger top-ups earn bonus credits, so buying in volume is cheaper per forecast. ### Paying for a run A run is billed for the compute it actually used, not a flat fee. Cheaper markets cost less; harder, multi-outcome markets cost more. The estimate is shown before you commit, and your balance clears a small floor before a run starts, so a run never begins that cannot be paid for. {% hint style="success" %} **You are not charged when the engine refutes its own forecast.** If [self-verification](/nfa-docs/the-forecasting-engine/self-verification.md) vetoes a run because of an engine defect, the credits for that run are waived. You pay for forecasts, not for the engine catching its own mistakes. {% endhint %} Every credit movement, purchase, spend, or waiver, is recorded in an append-only ledger, so your balance always has a full history behind it. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://nfa.gitbook.io/nfa-docs/the-economy/credits.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.