BuildBear

Provides cloud-based EVM sandboxes that let developers test smart contracts and dApps under real mainnet conditions, including mainnet forking, integration with off-chain services like oracles and account abstraction, and persistent state for debugging. Serves Web3 software developers and engineering teams in startups to enterprises building on EVM-compatible chains. Delivered as a fully managed SaaS with private shareable sandboxes, a plugin ecosystem, faucet, and transaction explorer, supporting Foundry and Hardhat workflows.

Key features

• EVM sandbox for smart contract testing
• Mainnet forking simulation
• Persistent and forkable sandbox state
• Private and shareable cloud sandboxes
• Unlimited native and ERC20 faucet tokens
• Transaction explorer and debugging
• Plugin ecosystem for off-chain services
• Account abstraction bundler and paymaster plugins
• Chainlink VRF and price feed plugins
• Support for multiple EVM chains
• Foundry and Hardhat framework support
• Frontend and backend dApp integration testing