List of Developer Tooling projects on Optimism (2026)

WDK provides open-source libraries and modules for building self-custodial wallets supporting multiple blockchains. The modular architecture includes wallet modules for blockchain operations, protocol modules for DeFi integrations including swaps, bridges, and lending, and pre-built UI components for React Native. Built on Bare runtime, it supports Node.js and React Native environments, enabling deployment across mobile, desktop, embedded systems, and server applications.

MDK is an open-source developer framework that gives Bitcoin mining operators and developers unified control over mining infrastructure. It combines a backend software development kit with a modular worker and orchestration architecture that standardizes communication with miners, sensors, cooling, and electrical systems, alongside a user interface development kit for building dashboards. Developers use it to build monitoring dashboards, automated workflows, pool management tools, and analytics or optimization applications without building device-level integrations from scratch.

OP Stack is an open-source software stack for building Layer 2 blockchains and rollups that settle to Ethereum. Developers use OP Stack components to launch custom chains with configurable execution layers, sequencers, and data availability options while inheriting Ethereum security through fraud-proof verification. Chains built on OP Stack natively interoperate within the Superchain ecosystem through shared messaging and bridge protocols.

Actions SDK is a developer toolkit that allows applications to embed DeFi lending, borrowing, and token swap features through a single integration. It connects to established lending and exchange protocols, handles wallet interactions through supported providers, and offers configurable controls for asset allowlists, chain restrictions, and custody models. The SDK targets OP Stack chains and Ethereum mainnet, enabling non-blockchain-native teams to ship DeFi functionality without building separate protocol integrations.

Chainlink VRF generates verifiable random numbers for smart contracts through cryptographic proof mechanisms published and verified onchain. The system prevents tampering by oracle operators, developers, or miners through cryptographic verification of random value generation. VRF v2.5 supports subscription-based and direct funding payment models with LINK or native tokens.

Chainlink Automation executes smart contract functions through decentralized oracle networks monitoring onchain conditions and time-based triggers. The system automates transaction execution without centralized infrastructure, uses the same node operators securing Chainlink data feeds, and enables developers to offload operational maintenance for protocol automation workflows.

Chainlink Functions provides smart contracts with trust-minimized compute infrastructure for API data retrieval and custom computation execution. The system operates through decentralized oracle networks that execute source code in serverless environments, aggregate independent results through consensus, and support threshold-encrypted secrets for authenticated API access.

Chainlink Runtime Environment is an orchestration layer for institutional smart contracts enabling data connectivity, compliance, privacy, and cross-chain interoperability. The system compiles workflows into WebAssembly binaries executed across decentralized oracle networks, uses Byzantine Fault Tolerant consensus for operation verification, and supports Go and TypeScript SDK development.

Chainlink Runtime Environment (CRE) is a developer platform that lets builders compose modular oracle capabilities into custom cross-chain workflows using Go, TypeScript, and other languages. It re-architects Chainlink's platform into purpose-built decentralized oracle networks (DONs) per capability, coordinated through DON-to-DON communication. CRE enables institutional-grade smart contracts to operate across public and private blockchains with built-in compliance and privacy support.

Chainlink Privacy Standard is a developer framework that enables private smart contracts on public and private blockchains by combining trusted execution environments (TEEs), zero-knowledge proofs, and the DECO protocol. It provides confidential computing through Chainlink Confidential Compute, selective disclosure for regulatory compliance, and cross-chain private transaction support via CCIP. Institutions use the standard to protect trade logic, tokenized asset metadata, and KYC credentials while remaining auditable to designated counterparties.

A set of APIs and developer tools including Swap (Classic, Fusion, Fusion+), Portfolio API, Web3 RPC, security endpoints, and data APIs for tokens and pricing.

1inch Business is a set of APIs and software development kits that give developers programmatic access to token swaps, orderbook data, balances, pricing, portfolio analytics, and RPC node endpoints. Developers integrate these APIs to build trading, wallet, and agentic applications without operating their own infrastructure. The suite covers multiple blockchains and supports API key or OAuth-based authentication.

DCAP Dashboard automates onchain collateral upkeep for Intel SGX and TDX attestation workflows through smart contracts deployed across multiple EVM networks. The platform continuously fetches, validates, and refreshes DCAP collateral files including PCK certificates, TCB info, and CRLs, preventing silent attestation failures as upstream certificates expire or are revoked. It provides a unified interface for monitoring collateral health across validator networks, rollups, and AI agent infrastructure, backed by Automata's TEE Attestation SDKs and Multi-Prover AVS.

Crossmint Authentication provides user identity verification through email, social media logins, and wallet connections. The system enables progressive onboarding flows and integrates with the wallet infrastructure for identity management. Developers use it as a user management layer tightly tied into other Crossmint products.

Rollup-as-a-Service is a platform that enables enterprises to deploy custom Layer 2 rollups on Ethereum within minutes, providing enterprise-grade infrastructure with 24/7 monitoring and Web3 service integrations.

A transaction relay service that submits user requests to supported EVM networks and enables gasless or ERC‑20–paid execution via a cross‑chain Gas Tank. The SDK and API handle submission from off‑chain to on‑chain with fast inclusion and no downtime.

An ERC‑4337 bundler with support for verifying and ERC‑20 paymasters plus a unified Gas Tank on Polygon for multi‑chain sponsorship. It settles exact gas post‑execution, removes prefunding, and returns enhanced user operation tracking with real‑time status updates.

A verifiable randomness service for smart contracts. Requests are processed via Gelato Web3 Functions, with network‑specific fee premiums charged as a percentage of gas.

Fee Collector is a protocol fee aggregation service that automatically collects fees in any ERC-20 token and converts them to USDC daily. Protocols using Gelato's Paymaster & Bundler can activate fee collection in one click, eliminating manual token swaps and consolidating fragmented balances across chains into a single, stable USDC balance for simplified revenue reporting and accounting.

Chainlist is a reference directory of EVM-compatible blockchain networks providing chain IDs, native currency details, and public RPC endpoints. Users browse available networks and add them directly to compatible wallets with a single action. Developers reference the data for standardizing network integrations.

meson.to is a developer SDK that lets web3 applications accept stablecoin deposits from any supported blockchain directly into their own smart contracts. It offers link-based, JavaScript SDK, and API integration methods, embedding a branded cross-chain interface within a host application. The toolkit routes transfers through the underlying cross-chain swap protocol, handling signature verification and transaction routing, while requiring host contracts to implement a specific deposit method to receive funds. It is used by developers who want to accept multi-chain deposits without building their own bridge infrastructure.

Subgraphs implement flexible blockchain indexing through TypeScript, enabling developers to create custom GraphQL APIs from smart contract data. The system processes on-chain events and provides queryable endpoints with webhook support and automated deployment capabilities.

Mirror implements real-time data streaming pipelines that sync blockchain data directly into databases and message queues. The system enables point-and-click configuration for multiple data destinations while providing unlimited access without per-query fees.

DeFi API is an API platform that provides unified access to multiple decentralized finance protocols and applications. It enables developers to integrate DeFi functionality including token swaps across chains, liquidity provision, and interaction with various DeFi projects through standardized endpoints.

A developer toolkit to build, test, deploy, and run custom blockchain data indexers and GraphQL APIs on the SubQuery Network, helping developers deliver fast, flexible data for dApps.

Squid Widget is an embeddable React component that allows applications to integrate cross-chain swapping functionality directly into their interfaces. The widget supports customizable themes and configurations for seamless user experiences.

Squid SDK provides TypeScript libraries and examples for developers to integrate cross-chain routing capabilities into their applications programmatically. The SDK offers route calculation and transaction execution functionality.

Squid API provides REST endpoints for calculating cross-chain routes and executing transactions. The API enables developers to access Squid Router functionality without client-side SDK integration.

Orderly Trading Infrastructure is a white-label orderbook infrastructure that provides shared liquidity across multiple blockchains. It enables developers to build spot and perpetual futures trading platforms with centralized exchange-level order matching performance and non-custodial, on-chain settlement. It is used by decentralized exchange builders and trading teams integrating trading functionality into their products.

A platform that enables users to create their own perpetual contract DEX in minutes without coding, providing customizable trading interfaces with built-in liquidity and professional infrastructure.

Portal Enclave MPC API provides server-side blockchain signing through TSS MPC cryptography combined with AWS Nitro Secure Enclaves. The system enables sub-second transaction signing for EVM-compatible and Solana smart contracts through RESTful API endpoints.

Portal Account Abstraction enables gas sponsorship, transaction batching, and programmable on-chain functionality through smart contract wallets. The system integrates with Portal's MPC infrastructure to provide configurable account abstraction features.

Haiku API provides programmatic access to the Declarative Transaction execution engine through REST endpoints. The strategy execution flow accepts a target portfolio state via /quote and converts it to an unsigned EVM transaction via /solve; a natural language flow processes plain-text commands via /buildIntentNaturalLanguage. The system handles cross-chain routing and protocol interactions with all-or-nothing execution guarantees.

QuickAlerts is a feature that provides real-time notifications about onchain events, helping users stay updated with the latest blockchain activities

Software development kit for easy integration of QuickNode services into applications.

Full-stack toolkit for building, deploying, and managing web3 applications on EVM-compatible blockchains with smart contract tools, SDKs, and infrastructure.

thirdweb Contracts offers audited smart contract templates and deployment tools for tokens, NFTs, marketplaces, and DAOs across any EVM-compatible blockchain with modular and upgradeable architecture.

thirdweb Engine is a backend server that reads, writes, and deploys contracts at production scale with automatic nonce management, stuck transaction resubmission, and gas fee management.

Topper is a fiat-to-crypto on-ramp and crypto-to-fiat off-ramp delivered through an embeddable widget and developer APIs for business partners and wallets. Consumers buy crypto directly to a self-custodial wallet using cards, digital wallets, or bank transfers, and sell crypto to receive fiat on a linked debit card. The product supports recurring purchases and integrates via a web SDK, mobile SDK, REST API, webhooks, and single sign-on for partner applications.

Implements rollup infrastructure through optimized node services, enabling Layer 2 blockchain deployment and management. The system supports multiple rollup architectures with integrated monitoring and scaling capabilities.

NFTScan Developer Platform delivers comprehensive NFT data services through REST APIs, enabling developers to access ERC-721 and ERC-1155 asset information, transaction records, collection statistics, and marketplace data across multiple blockchain networks.

NFTScan Site provides professional management backend and site services for NFT collections, NFT marketplaces, and NFTfi projects within the NFT ecosystem.

0x Gasless API is a developer tool that enables token swaps without requiring users to hold native chain tokens for gas. It sponsors transaction fees on behalf of end users by abstracting gas payments and approvals into the backend, covering both gasless approvals and gasless swaps in a single flow. The API integrates into wallets and applications to remove a common onboarding friction point for users new to on-chain trading.

Tatum Platform is a unified blockchain development toolkit providing RPC nodes, APIs, SDKs, and developer tools for building Web3 applications. The system offers access to multiple blockchain protocols through standardized interfaces while maintaining cross-chain compatibility and enterprise-grade infrastructure.

Prime SDK is a development toolkit that removes Web3 usability barriers by providing ERC-4337 account abstraction infrastructure. The SDK enables developers to build applications with gasless transactions, transaction batching, and cross-chain functionality across multiple EVM networks.

Modular SDK is an ERC-7579 development toolkit that enables customizable smart accounts through modular architecture. The SDK allows developers to enhance security and user experience by integrating various modules for account functionality and supports EntryPoint 0.7.0.

TransactionKit is a React library for Web3 development that enables transaction batching, cross-chain functionality, and gasless transactions. The library allows frontend developers to integrate smart account features without deep blockchain knowledge through React components.

Skandha is an ERC-4337 compliant bundler service that collects multiple UserOperations and combines them into single transactions to reduce gas costs. The TypeScript bundler supports EIP-7702, EntryPoint versions 0.6, 0.7, and 0.8, and provides built-in MEV protection with shared mempool functionality.

Arka Paymaster Service is an open-source ERC-4337 compliant paymaster that enables sponsored and gasless transactions. The service allows users to pay gas fees with stablecoins and enables projects to cover transaction costs for their users through smart account sponsorship.

deBridge Liquidity Network is a cross-chain and same-chain trading infrastructure that provides fast, capital-efficient swaps with guaranteed rates. Users specify desired outcomes through orders, which professional solvers fulfill competitively by supplying tokens on destination chains immediately and later claiming source tokens, all secured by the underlying messaging layer. The network operates on a zero-TVL model without traditional liquidity pools, enabling near-instant settlement, zero slippage, and delivery of native rather than wrapped assets. It is accessible through a trading interface, an API for custom integrations, and an embeddable widget.

dePort is a native bridge for assets that lets protocols deploy synthetic representations of their tokens across multiple blockchain networks using a lock-and-mint model. Native tokens are locked in a smart contract on the source chain while corresponding synthetic assets are minted on destination chains, with total minted supply always fully backed by the locked collateral. The system supports automatic listing, so any token can be bridged without prior approval, and it can also serve as a canonical custody bridge for chains connected through deBridge infrastructure services. It is built on the underlying messaging protocol and targets token issuers and protocols seeking multi-chain presence without wrapped-asset risk.

OpenZeppelin Contracts is a library of modular and reusable smart contracts available for Ethereum-compatible blockchains in Solidity and for Starknet in Cairo, implementing standards like ERC20 and ERC721 with focus on security, gas efficiency, and best practices.

A secure operations platform for smart contract development that enables secure automation, monitoring, and management of blockchain applications across 30+ networks.

Linkio API is a developer API that lets applications and websites integrate stablecoin and fiat FX conversion directly into their own products. It exposes endpoints for initiating on-ramp and off-ramp transactions, generating payment links, checking rates, and monitoring transaction status through webhooks. Developers building remittance, checkout, wallet, or payroll products use it to add currency conversion without operating their own compliance or settlement infrastructure.

AppKit implements wallet connectivity and onchain UX infrastructure through modular SDK architecture, enabling wallet logins, multichain support, and user analytics. The system provides social authentication, embedded wallet creation, and transaction management while maintaining cross-platform compatibility.

Token Terminal Data Room provides SQL-based access to Token Terminal's multichain data warehouse, enabling technical teams to query and analyze raw blockchain data directly.

Token Terminal Sheets integrates blockchain data directly into Google Sheets and Excel through plugins and pre-built functions for analysis workflows.

A development kit for building smart account modules that work across all ERC-7579 compliant accounts. ModuleKit provides standardized interfaces, testing frameworks, deployment scripts, and third-party integrations for module development.

Cross-chain infrastructure that enables secure wallet-to-app connectivity through decentralized service nodes, gateway nodes, and relay services using rendezvous hashing-based database architecture.

Pier Two Network Services is a blockchain node operation infrastructure supporting validation, oracle data feeds, and cross-chain application services across Layer 1 networks and testnet environments. The service operates full nodes providing transaction validation, data availability, and network connectivity for decentralized applications requiring persistent blockchain access without self-hosted infrastructure requirements.

Lantern is an Ethereum light client implementation in C# enabling peer-to-peer consensus tracking on resource-constrained devices without full node requirements. The client maintains direct connections to beacon nodes through libp2p protocol, tracking sync committee signatures for consensus verification while eliminating dependence on centralized RPC providers for blockchain data access.

Nirvana Cloud is a bare metal cloud platform optimized for blockchain, AI, and real-time workloads, combining compute, storage, networking, and orchestration into a single stack. It provides high-clock virtual machines, accelerated block storage with sustained IOPS and sub-millisecond latency, and a private low-latency networking layer for connecting to external clouds without egress fees. A managed Kubernetes service handles cluster provisioning and autoscaling, while isolated agent sandboxes let developers run and checkpoint autonomous AI agents. Users deploy validators, RPC nodes, data pipelines, inference workloads, and trading infrastructure while offloading hardware management to the platform.

Sign Protocol provides omni-chain attestation infrastructure through smart contracts and APIs, enabling cross-chain verification of information. The system supports multiple blockchains while maintaining decentralized attestation standards.

Noves App provides a unified platform for blockchain data services, enabling access to various APIs, tools, and features including transaction inspection, data export for tax purposes, and integration solutions across 80+ blockchain networks.

Foresight API analyzes unsigned transactions to show what they will do before execution, providing plain-English descriptions and simulations of anticipated asset transfers and contract interactions.

Mimic Protocol is a permissionless, non-custodial, intent-based blockchain execution protocol that powers automation across decentralized applications. It works through a planning layer where users define functions that generate intents, an execution layer where a coordination engine broadcasts intents to competing solvers, and a security layer where settler contracts verify execution against user-defined constraints. Developers and builders use it to create deterministic, verifiable automation such as rebalancing, fee routing, or conditional transfers across multiple blockchains.

NodeReal API Marketplace is a developer tooling platform that aggregates third-party and first-party blockchain APIs into a single subscription interface. Developers browse and subscribe to packaged APIs covering NFT data, DeFi analytics, wallet toolkits, token indexing, and chain-specific endpoints from partners including NFTScan, Covalent, and PancakeSwap. Access is managed through NodeReal's unified authentication and billing layer.

A unified API infrastructure providing read and write connectivity to multiple blockchains and DeFi protocols. The system supports transaction signing, data querying, price discovery, trade decoding, compliance checks, and liquidity management across DEXs, bridges, lending platforms, staking protocols, oracles, and NFT marketplaces. The platform uses a modular architecture enabling developers to interact with various chains and protocol endpoints through standardized API calls.

Superbridge Rollies is infrastructure-as-a-service that provides customizable bridge interfaces for blockchain teams. The system includes dedicated indexers, custom domains, theme customization, and integration support for OP Stack and Arbitrum Orbit rollups.

Peanut Protocol is a self-custodial peer-to-peer payments application for sending and receiving digital dollars across borders. Users deposit and withdraw funds using passkey authentication, then send money via simple links or QR codes, including local payment rails such as MercadoPago QR in Argentina and Pix in Brazil, with no local ID or bank account required. The app covers network fees on deposits and withdrawals and supports multiple stablecoins across several blockchain networks. Developers can integrate payment functionality into their own applications through an accompanying SDK and API.

Python framework for building selective blockchain indexers. Includes code generation, ORM integration, and multiple datasource support with TimescaleDB and GraphQL integration.

Ready-to-use blockchain data API service exposing extensive blockchain data collections through GraphQL interfaces, from generic to application-specific datasets.

GraphQL IDE for interacting with DipDup APIs, featuring a query editor, interactive explorer, and documentation integration for improved developer experience.

RISC Zero zkVM is a zero-knowledge virtual machine that enables developers to write applications with verifiable computation in Rust and other languages.

Bonsai is a decentralized proving engine that allows developers to integrate ZK proofs into applications.

Steel enables developers to run Solidity contracts in RISC Zero's zkVM. It uses off-chain execution with on-chain verification to reduce gas costs and enhance smart contract capabilities.

Rollup Engine provides developers with tools to deploy custom Ethereum Layer 2 and Layer 3 blockchains using established frameworks like Arbitrum Nitro, Optimism Bedrock, ZK Stack, and Polygon CDK. The platform manages deployment, customization, maintenance, and security for rollups.

AbstractionKit is an open-source TypeScript SDK that provides developers with tools to build ERC-4337 and EIP-7702 smart wallets. The platform features Safe Account integration, user operation construction, gas sponsorship through integrated paymaster services, transaction bundling via Voltaire bundler infrastructure, social recovery capabilities, and includes a reference mobile wallet implementation demonstrating seedless recovery, gasless transactions, and batch operations.

Walnut Debugger is a web-based transaction debugger and simulator for Starknet smart contracts, enabling developers to inspect variable states at each execution step and simulate transactions before on-chain deployment. The tool supports source-code-level debugging via contract verification, call trace inspection, and gas profiling against the CairoVM.

Walnut EVM is an open-source transaction debugger and simulator for EVM-compatible chains, supporting Ethereum, Arbitrum, Base, Optimism, Linea, and Katana. The tool traces transaction execution, enables re-simulation with custom calldata, and provides gas profiling; it can be self-hosted against any debug-capable RPC endpoint.

Cairo Playground is a browser-based interactive environment for exploring the CairoVM and writing Cairo code, allowing developers to experiment with Cairo, Sierra, and CASM with step-by-step execution debugging. The tool is hosted on cairovm.codes and targets Starknet and Cairo developers who want to prototype or test contract logic without a local setup.

An open source Ethereum protocol for memberships & subscriptions.