# Overview In order to make permissionless loans work, an NFT price oracle is required to determine the NFT's value. Initially, the floor price of the collection will be used to set the underlying value for supplied NFTs. The NFT floor price oracle is built using Chainlink infrastructure, enabling anyone to become a node operator. Chainlink oracle uses an average of 3 data sources: Drops Spot Floor, NFTBank Floor and NFTX indexes. Drops Spot Floor price is calculated in 4 steps:\ \ 1\. Verifying sale \ 2\. Extreme outliers removal\ 3\. Probable outliers removal\ 4\. Floor and 24 hour TWAP --- # Agent Instructions: 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: ``` GET https://docs.drops.co/nft-price-oracle/overview.md?ask= ``` The question should be specific, self-contained, and written in natural language. 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.