Price Oracle Staleness Checker
Free to download on every platform. Comes pre-installed on BotFone, BotPad and BotFlip — with extra free apps included.
About this app
WHAT IT DOES
Price Oracle Staleness Checker helps DeFi developers and users verify that a price feed is up‑to‑date before relying on it for protocol operations. You provide a price oracle contract address (e.g., a Chainlink AggregatorV3Interface) and a staleness threshold in seconds; the tool reads the latest price, its update timestamp, and the current block time. It then calculates the age of the price and reports whether it is fresh or stale. This is critical for protocols that depend on accurate pricing — using a stale oracle can lead to front‑running, arbitrage, or liquidation vulnerabilities.
HOW TO USE
Enter the price oracle contract address (e.g., 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419 for ETH/USD on Ethereum). Optionally set a staleness threshold in seconds — the default is 3600 seconds (1 hour). Click "check staleness". The tool reads the latest round data using the Chainlink AggregatorV3Interface standard, extracts the price, decimals, and update timestamp, and compares the age against your threshold. Results show the formatted price, the exact age, and a clear pass/fail status.
THE REAL MECHANISM
The tool uses ethers.js v5 to connect to the blockchain via the connected wallet or a custom RPC URL. It instantiates a contract interface using the Chainlink AggregatorV3Interface ABI (latestRoundData, decimals, description) and reads the latest round data. If the oracle does not expose this interface, it falls back to a simpler interface (latestAnswer, latestTimestamp, decimals) which is compatible with older Chainlink feeds and some custom oracles. The tool then compares the updatedAt timestamp from the latest round against the current block timestamp. The age is calculated in seconds, and a status is determined based on the user‑provided threshold. All data is displayed with human‑readable timestamps and formatted prices.
WHAT IT CANNOT SEE
The tool cannot detect if the oracle's price is manipulated or incorrect, verify the oracle's source of truth, detect stale prices if the oracle does not expose a timestamp, handle custom oracle implementations that deviate from standard interfaces, determine if the staleness threshold is appropriate for the specific use case, or detect off‑chain price manipulation. A "fresh" status only indicates that the price was updated recently — it does not guarantee that the price is accurate, uncorrupted, or suitable for your protocol's needs.
PLEASE NOTE — EVM CHAINS ONLY
This tool is designed for price oracles on Ethereum Virtual Machine (EVM) compatible chains that implement Chainlink‑compatible interfaces. It does not support oracles on non‑EVM chains or custom implementations that do not follow the standard ABI. All processing occurs in your browser; no contract data is stored or transmitted.
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