# Fee Management ## Message Fees Proto-USD uses a static fee model of **0.25 USDC per hop**, regardless of the transfer amount (e.g., whether the user sends $20 or $200,000). This fee is fully automated and abstracted. The implementing party does not pay message fees. ## Gas Fees (Mainnet) **NOTE: ONLY PERTAINS TO INTEGRATING BLOCKCHAIN FOUNDATIONS** Gas fees are required on the destination chain to automatically relay cross-chain messages. These fees are paid using the wrapped native gas token (e.g., WETH on Ethereum, WAVAX on Avalanche) within the `BridgedManagerV1` contracts. To ensure the successful completion of transfers, the blockchain foundation / team is responsible for managing the destination [gas reimbursement mechanism](https://docs.vialabs.io/supported-protocols/proto-usd/gas-reimbursement-mechanism). The Bridged Manager contracts **must maintain sufficient wrapped gas tokens** to support the automatic relaying of messages. On chains with infinitesimally low gas fees, protocols often choose to sponsor this fee. However, on networks like Ethereum, gas fees can accumulate quickly. ## Gas Fees (Testnet) VIA Labs sponsors all gas on testnet. New implementing blockchains are asked to provide testnet tokens. --- # 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.vialabs.io/supported-protocols/proto-usd/fee-management.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.