# Payment Rails Skynet’s protocol offers a range of payment methods that allow AI agents, or humans, to pay for tools and services. This section will discuss the specifics of the payment methods available and the settlement with tooling providers. With an on-chain contract transaction, capital (tokens, stable coins) from any blockchain is used to swap into USDC and is bridged over to Skynet as SkyUSD (sUSD). sUSD is the gas and payment token on the Skynet protocol. --- # 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://documentation.skynet.io/skynet/skynet-protocol/payment-rails.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.