Decentralized finance (DeFi) has been gaining popularity as a new way of interacting with financial services. However, this new paradigm comes with its own set of risks and challenges. One of the biggest challenges facing DeFi is the potential for flashloan price oracle attacks. In this article, we will explore what flashloan price oracle attacks are, how they work, and what can be done to prevent them.

What is a Flashloan Price Oracle Attack?

A flashloan price oracle attack is a type of exploit that targets DeFi protocols that rely on price oracles to determine asset values. The attack involves the attacker taking out a flashloan, which is a type of loan that is granted and repaid within the same transaction. The attacker then uses the flashloan to manipulate the price oracle by feeding it false data, causing the oracle to report incorrect asset values. The attacker can then use this false data to profit from the DeFi protocol in question.

How does a Flashloan Price Oracle Attack work?

The flashloan price oracle attack works by exploiting the way DeFi protocols use price oracles to determine the value of assets. Price oracles are external systems that provide data about the value of assets in the market. DeFi protocols use this data to calculate the value of assets in their own system.

Flashloan Price Oracle Attack

When an attacker executes a flashloan price oracle attack, they take out a flashloan and use it to buy a large amount of an asset in the market. This causes the price of the asset to rise, which is then reported back to the price oracle. The price oracle then reports the higher price to the DeFi protocol, which is now using the inflated price to calculate the value of the asset. The attacker can then sell their asset at the inflated price, profiting from the difference.

Highlight case

The Spartan Protocol attack on May 2, 2021, is one of the most significant examples of a Flashloan Price Oracle Attack in the cryptocurrency world. Spartan Protocol is a decentralized platform that allows users to trade synthetic assets based on the price of various cryptocurrencies. The platform uses a decentralized price oracle, which is essentially a smart contract that aggregates price data from multiple sources to determine the current price of an asset.

The attackers in the Spartan Protocol attack exploited a vulnerability in the platform’s price oracle to manipulate the price of certain assets. By doing so, they were able to obtain a flashloan of over $30 million worth of Binance Coin (BNB) and Ethereum (ETH) from the lending platform, Binance Smart Chain’s PancakeSwap. Flashloans are a type of uncollateralized loan that allows users to borrow funds from a lending platform without putting up any collateral.

After obtaining the flashloan, the attackers used the borrowed funds to manipulate the prices of certain tokens on the decentralized exchange (DEX) and made a profit of over $30 million. The attack resulted in a significant loss for Spartan Protocol, and the price of the protocol’s native token, SPARTA, fell by over 70%.

The attack on Spartan Protocol highlights the potential risks associated with Flashloan Price Oracle Attacks. These attacks can be devastating for decentralized platforms and their users, as they can result in significant financial losses. However, the attack also underscores the importance of implementing robust security measures, such as multiple sources of price data and thorough testing of smart contracts, to prevent such attacks from occurring.

In response to the attack, Spartan Protocol announced that it would be implementing additional security measures, including adding more price feeds to its price oracle and conducting external audits of its smart contracts. The protocol also launched a compensation plan to reimburse affected users for their losses.

Overall, the Spartan Protocol attack serves as a cautionary tale for the cryptocurrency industry, highlighting the need for continued development of robust security measures to mitigate the risks associated with Flashloan Price Oracle Attacks and other forms of exploitation in the decentralized finance (DeFi) ecosystem.

What are the risks of a Flashloan Price Oracle Attack?

Flashloan price oracle attacks pose a significant risk to DeFi protocols. If successful, the attacker can manipulate the price of an asset, causing the DeFi protocol to report incorrect asset values. This can lead to losses for users who rely on the protocol’s asset values to make financial decisions. Additionally, successful attacks can undermine the trust in DeFi protocols, which can have long-term consequences for the DeFi ecosystem as a whole.

What are the solutions to prevent Flashloan Price Oracle Attacks?

Several solutions have been proposed to prevent flashloan price oracle attacks. One solution is to use multiple price oracles instead of relying on a single oracle. This can help to prevent manipulation by any single oracle. Additionally, using a decentralized oracle system that relies on multiple sources of data can help to prevent attacks by ensuring that no single source can manipulate the data.

Another solution is to implement circuit breakers, which are mechanisms that can be triggered to halt trading activity if certain conditions are met. For example, a circuit breaker can be triggered if the price of an asset deviates too far from its expected value. This can help to prevent losses by halting trading activity before any further harm can be done.


Flashloan price oracle attacks pose a significant risk to DeFi protocols and their users. As DeFi continues to grow and evolve, it is essential that the ecosystem develops effective solutions to prevent these types of attacks. Using multiple price oracles, implementing circuit breakers, and relying on decentralized oracle systems are just a few of the solutions that can be employed to prevent flashloan price oracle attacks. By working together to implement these solutions, we can help to ensure that DeFi remains a secure and trustworthy ecosystem for years to come.


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