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Optimism

OP Sepolia JSON-RPC

Public Ethereum JSON-RPC endpoint for the OP Sepolia testnet (chain ID 11155420) used for development and integration testing.

Documentation Provider Profile APIs.io OpenAPI GitHub

OP Sepolia JSON-RPC is one of 10 APIs that Optimism publishes on the APIs.io network, described by an AsyncAPI event-driven specification.

Tagged areas include JSON-RPC, Testnet, and Sepolia. The published artifact set on APIs.io includes API documentation and an AsyncAPI specification.

Requests are made against the base URL https://sepolia.optimism.io.

Metadata

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Specification
OpenAPI
Base URL
https://sepolia.optimism.io

Specification

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Source

optimism-asyncapi.yml Raw ↑

Other APIs Optimism publishes across the network.

OP Mainnet JSON-RPC
AE Profile APIs.io
Optimism Bridge (Standard Bridge)
AE Profile APIs.io
OP Stack
AE Profile APIs.io
Superchain Registry
AE Profile APIs.io
Optimism SDK (Viem extension)
AE Profile APIs.io
Supersim
AE Profile APIs.io
Optimism Etherscan
AE Profile APIs.io
Optimism Blockscout
AE Profile APIs.io
Optimism JSON-RPC API
AE Profile APIs.io
#JSON-RPC#Testnet#Sepolia
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API Details
ID
optimism:sepolia-rpc
Base URL
https://sepolia.optimism.io
Docs
https://docs.optimism.io/superchain/networks
Provider
Optimism
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This is an independent, third-party profile of OP Sepolia JSON-RPC, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

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