Current Fees
Pyth Core update fees are zero on every supported network
The Pyth Core update fee is 0 across all mainnet EVM chains. Pyth governance zeroed the fee in OP-PIP-128 as part of the Pyth Core sunset, so there is no longer a per-chain fee schedule to consult.
Passing 0 as msg.value to updatePriceFeeds is sufficient on every network.
Integrations that call getUpdateFee keep working unchanged — it returns the
authoritative fee for a given chain, which is now 0.