A pre-execution safety gate that simulates EVM transactions via Tenderly to verify asset changes before they happen.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install onchain-verify-transaction
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install onchain-verify-transaction using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is Onchain Verify Transaction?
Onchain Verify Transaction is a specialized security tool within the Openclaw Skills ecosystem designed to eliminate the risks of blind-signing. By simulating transaction payloads against forked chain states using Tenderly, it provides a transparent view of exactly which tokens will move, in what amounts, and to which addresses before a user ever interacts with their wallet.
This skill serves as a critical infrastructure layer for other AI agent workflows. It decodes opaque calldata from swap routers or external APIs, transforming raw hex strings into human-readable balance and asset changes. By implementing this as a mandatory pre-execution check, developers can ensure that their Openclaw Skills never execute a transaction that results in an unexpected drain or incorrect token destination.
Onchain Verify Transaction Use Cases
- Validating raw calldata produced by external swap aggregators or untrusted APIs.
- Detecting potential wallet drains or malicious approval requests before signing.
- Verifying that cross-chain swap outputs are landing in the correct recipient wallet.
- Checking for slippage or price impact by comparing simulated output amounts against quoted rates.
How Onchain Verify Transaction Works
- The skill receives a transaction payload containing the sender, recipient, calldata, and chain ID.
- It identifies the correct Tenderly gateway endpoint based on the provided network (e.g., Base, Ethereum, Optimism).
- A simulation request is sent to the Tenderly API using the
tenderly_simulateTransactionmethod. - The skill parses the
assetChangesandbalanceChangesfrom the simulation results. - It runs a series of security checks to verify token identity, destination, and amounts.
- Control is returned to the calling agent with either a green light or a detailed warning of detected discrepancies.
Onchain Verify Transaction Setup
To integrate this safety gate into your Openclaw Skills environment, you must configure your Tenderly credentials:
# Obtain your key from tenderly.co
export TENDERLY_NODE_ACCESS_KEY="your-key-here"
Ensure that the environment variable is accessible to your AI agent at runtime.
Onchain Verify Transaction Data Schema & Taxonomy
The skill processes transaction objects and maps them to simulation results using the following schema:
| Input Field | Type | Description |
|---|---|---|
from |
address | The originating wallet address |
to |
address | The contract or recipient address |
data |
hex string | The encoded calldata to be simulated |
chainId |
integer | The network ID (e.g., 1 for Ethereum, 8453 for Base) |
Validation Output
- Asset Changes: Tracks ERC-20 transfers (Address, From, To, Amount).
- Balance Changes: Tracks native gas token (ETH) fluctuations per address.
Onchain Verify Transaction Advanced Features
- Multi-chain support for major EVM networks including Arbitrum, Polygon, and Optimism.
- Automated input drain detection to prevent unauthorized token spending.
- Deep calldata inspection to flag unexpected or unlimited token approvals.
- Fail-safe logic that halts execution and requires manual user intervention if simulation fails or discrepancies are found.
SKILL.md
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