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Optimism Sepolia RPC Use Uniblock’s JSON-RPC endpoint to access Optimism Sepolia with low-latency routing and a single API surface across providers.

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What is Optimism Sepolia?

Optimism Sepolia is an EVM-compatible testnet. It is a testnet for Optimism.

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What is the Optimism Sepolia JSON-RPC API?

The JSON-RPC API is the standard interface for reading chain state, sending transactions, and interacting with smart contracts where supported.

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Making API requests

Send a POST request to https://api.uniblock.dev/uni/v1/json-rpc?chainId=11155420. Include the JSON-RPC method and params in the request body.

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Supported networks

NetworkTypeChain ID
OptimismMainnet10
Optimism SepoliaTestnet11155420

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API reference

Browse the available method groups for this chain: