Best Layer 1 Protocols for API3

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Compare the Top Layer 1 Protocols that integrate with API3 as of October 2025

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This a list of Layer 1 Protocols that integrate with API3. Use the filters on the left to add additional filters for products that have integrations with API3. View the products that work with API3 in the table below.

What are Layer 1 Protocols for API3?

Layer 1 protocols, also known as layer 1 blockchains, are blockchain protocols that are built as the base layer of a blockchain. A layer 1 protocol serves as the underlying base blockchain of a blockchain network, as opposed to a layer 2 protocol which is designed to improve the scaling problems and transaction speeds and fees that layer 1 blockchain networks and protocols face. Decentralized applications and cryptocurrencies can be built on Layer 1 protocols, and layer 1 protocols interact with layer 2 protocols in order to improve efficiency and overall user experience. Compare and read user reviews of the best Layer 1 Protocols for API3 currently available using the table below. This list is updated regularly.

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    Harmony

    Harmony

    Harmony

    Harmony is an open and fast blockchain. Our mainnet runs Ethereum applications with 2-second transaction finality and 100 times lower fees. Harmony’s secure bridges offer cross-chain asset transfers with Ethereum, Binance and other chains. Harmony serves as a platform for creators to connect with their community. Harmony’s bridges can connect any Proof-of-Work and Proof-of-Stake chains. Our FlyClient architecture are fully trustless and highly gas-efficient. Currently, our bridges for Ethereum and Binance Smart Chain secure tens of millions cross-chain assets. Developers simply change Chain ID and enjoy faster EVM executions identical at the bytecode level. They can use their familiar and standard Web3 tooling to easily migrate to Harmony. What about users? They can continue to use MetaMask or Ledger — but now pay minimal fees. Any Ethereum wallets or portals can work on Harmony without code changes or new installs.
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