This week, the foundation introduced Kora, a new fee relayer and signing node. It is designed to make Solana apps easier to use, safer to operate. Also, more flexible for developers and businesses.
For beginners, fees are the small costs paid to process a transaction on a blockchain. For builders, managing those fees at scale can become complex fast. Kora removes that friction.
Making Fees Invisible for Users
Kora allows apps to fully sponsor transaction fees, meaning users can interact with a Solana app without holding SOL at all. Even more, fees can be paid in any token, including stablecoins like USDC. This is a big shift from the usual model where users must first buy the network’s native token just to get started.
Introducing Kora, a fee relayer and signing node for the @Solana ecosystem, enabling fee-free transactions, custom fee tokens, and more https://t.co/7wlmeYrbT6 pic.twitter.com/zloRLZ7oD9
— Solana Foundation (@SolanaFndn) December 22, 2025
The Solana Foundation said Kora was built because there was no modern, standard way to handle fee sponsorship and remote signing. Even though Solana’s account model makes it possible. Kora fills that gap with a ready to use solution.
A real world example helps explain the impact. Imagine a gaming app on Solana that wants new players to onboard instantly. With Kora, the game can pay transaction fees on behalf of users and even charge those fees in an in game token. Players never see a wallet popup asking for SOL, making the experience feel closer to a traditional app.
Kora provides a standard RPC server and CLI to sign and pay for fees from a topped up wallet using Solana Keychain
Learn more about how Keychain works from @dev_jodee https://t.co/j8ReZfIwSa pic.twitter.com/yGbqHfFbO5
— Solana Foundation (@SolanaFndn) December 22, 2025
This approach matches a wider industry trend. According to Electric Capital, developer activity is increasingly moving toward improving user experience. Not just raw performance. Fee abstraction is a key part of that shift.
Safer Signing and Better Controls
Kora also tackles another sensitive issue: signing transactions. Signing is the act of approving a transaction with a private key. Instead of keeping keys on local servers, Kora can offload signing to secure environments. For example, AWS KMS or services such as Turnkey. It supports six remote signers and provides metrics that warn teams when funds are running low.
Kora has been fully audited and differentially fuzzed by the great team at @rv_inc
Find more details about the result here:https://t.co/kGX11c3vuE
— Solana Foundation (@SolanaFndn) December 22, 2025
For developers, Kora includes a standard RPC server, a command line tool, and a simple configuration file. Teams can define which programs or users they allow. Also, validate transactions, define fee policies for different token standards, and even create custom rules. Importantly, Runtime Verification fully audited and tested Kora, adding an extra layer of trust.
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Rebecka Byron