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About Tenderly
Tenderly is the all-in-one Web3 development platform that revolutionizes how developers build, test, and monitor blockchain applications. Founded in 2018, Tenderly has become essential infrastructure for major protocols including Aave, Compound, Chainlink, and The Graph.
The platform's Transaction Simulator allows developers to preview transaction outcomes before sending them on-chain, catching errors and estimating gas costs. The advanced Debugger provides visual stack traces, state changes, and gas profiling for failed transactions—making it trivial to diagnose issues that would otherwise take hours. Virtual TestNets offer unlimited forks of mainnet with instant mining, perfect for testing complex DeFi integrations without spending real funds.
Tenderly's Monitoring & Alerts system tracks smart contracts in real-time, sending notifications via email, Slack, or Discord when specific events occur. Web3 Actions enables serverless functions that respond to on-chain events, allowing developers to automate complex workflows like liquidations, arbitrage, or governance participation. The platform supports all major EVM chains and processes millions of transactions daily, providing production-grade infrastructure for Web3 teams.
Key Features
Transaction Simulator
Preview transaction outcomes, state changes, and gas costs before sending on-chain
Debugger
Visual debugging with stack traces, state changes, and detailed gas profiling
Virtual TestNets
Unlimited mainnet forks with instant mining for realistic testing environments
Monitoring & Alerts
Real-time smart contract monitoring with customizable alerts via email, Slack, Discord
Web3 Actions
Serverless functions that respond to on-chain events for workflow automation
Fork Mainnet
Clone production state locally or in cloud to test against real protocol data
Use Cases
Debug Failed Transactions
Diagnose why transactions fail with visual stack traces and state inspection
Simulate Before Sending
Test transaction outcomes and gas costs before broadcasting to mainnet
Monitor Protocols
Track smart contract events and get instant alerts for critical changes
Automate Actions
Build serverless bots for liquidations, arbitrage, or governance automation
Test on Forks
Develop and test against real mainnet state without spending actual ETH
Project Info
Frequently Asked Questions
Tenderly is a development platform that solves blockchain's debugging problem. Unlike traditional software, smart contracts are deployed to an immutable blockchain where errors can't be easily debugged. Tenderly provides transaction simulation, visual debugging, monitoring, and testing infrastructure. It's essential because it dramatically reduces development time—what might take hours to debug manually takes minutes with Tenderly's visual tools.
Transaction simulation runs your transaction against a fork of the current blockchain state without actually broadcasting it. Tenderly executes the transaction, shows you exactly what will happen (state changes, events, gas costs), and whether it will succeed or fail. This is crucial for complex DeFi operations where you want to verify outcomes before spending real gas. You can simulate any transaction using Tenderly's Simulator before sending it.
Virtual TestNets are private forks of mainnet that you can spawn instantly. Unlike public testnets (Goerli, Sepolia), Virtual TestNets have real mainnet state and data—perfect for testing DeFi integrations. They offer unlimited ETH, instant mining (no waiting for blocks), and complete control. Public testnets have unreliable faucets and different state; Virtual TestNets let you test against production data risk-free.
When a transaction fails, Tenderly's Debugger shows a visual stack trace of exactly where it failed and why. You can step through each function call, see state changes at each step, inspect variables, and understand gas usage. It highlights the exact line in your Solidity code that caused the revert. This is far superior to cryptic revert messages on block explorers.
Tenderly offers a free tier with essential features: debugging public transactions, limited simulations, and basic monitoring. Paid plans (Developer, Team, Enterprise) provide higher simulation limits, Virtual TestNets, Web3 Actions, collaboration features, and priority support. Many indie developers use the free tier; teams building production dApps typically need paid plans for Virtual TestNets and automation.