Intent (Blockchain)

In blockchain systems, an intent is a signed message in which a user states the result they want rather than the exact steps to reach it. A user might sign an intent to swap one token for at least a certain amount of another within the next ten minutes, or to move funds to another chain, without choosing which exchange, pool or bridge to use. Specialized third parties, usually called solvers or fillers, compete to fulfil the intent in the best way, and the user's terms are enforced by smart contracts when the result is settled on-chain.

Intents contrast with ordinary transactions, which spell out each action, such as "call this contract with these parameters". The approach has spread in decentralized finance since the early 2020s through trading systems such as CoW Protocol and UniswapX, and through cross-chain designs. Supporters say intents make crypto easier to use and can give better prices; critics worry that they shift power to a small group of sophisticated solvers.

Booking a taxi by giving the driver turn-by-turn directions is like an ordinary blockchain transaction: the passenger decides every step. Booking a taxi by saying "get me to the airport by six, for no more than 40 dollars" is like an intent. The passenger sets the goal and the limits, and the driver chooses the route.

In crypto, users often do not know which of dozens of exchanges or bridges gives the best deal. With an intent, they say what they want and what they are willing to accept. Professional solvers then race to offer the best result, and the user's wallet only completes the deal if the terms are met.

1. Expression. The user's wallet or app creates a structured message describing the desired outcome, limits such as a minimum amount received, and a deadline, and the user signs it.
2. Distribution. The signed intent is sent to a network of solvers, either openly or through a private channel, rather than to the public mempool.
3. Competition. Solvers look for the best way to fill it, using liquidity on a decentralized exchange, their own inventory, matching with other users' opposite intents or a combination. Some systems run auctions, such as a Dutch auction in which the offered price improves over time until a solver accepts.
4. Settlement. The winning solver submits a transaction that fulfils the intent. A settlement contract checks that the user's conditions are satisfied before releasing funds; if not, nothing happens.

Because solvers usually pay the network fee and recover it from the trade, users may not need to hold the chain's native token, which overlaps with the goals of account abstraction.

• Token swaps. Intent-based trading lets users receive the best available price across venues, often with protection against slippage and against bots that copy or sandwich trades, a concern described under front-running.
• Coincidence of wants. When two users want opposite trades, a solver can match them directly, avoiding pool fees.
• Cross-chain transfers. A user can ask to have funds on another network; a solver delivers them from its own balance there and is repaid later, avoiding slow bridges. A shared standard for cross-chain intents, ERC-7683, was proposed in 2024.
• Chain abstraction. Intents support the idea of chain abstraction, in which users interact with applications without needing to know which chain holds their assets.

Intents can make trading simpler, since users state a goal instead of choosing routes, and they can improve prices because solvers compete. Failed transactions are less common, because users do not pay for attempts that do not meet their terms. Aggregating many users' orders also allows more efficient execution than each user trading alone, much as a DEX aggregator does.

• Solver concentration. Running a competitive solver requires capital, data and technical skill, so a few firms may handle most order flow, creating new intermediaries in a system meant to reduce them.
• Trust and transparency. Users depend on auctions being fair and on solvers not colluding or withholding better prices.
• Signing risk. Intents are signed messages, and malicious sites can try to trick users into signing harmful ones, so clear wallet displays remain important.
• Fragmentation. Different intent systems use different formats, which can split liquidity until standards are widely adopted.

Intents are still evolving, and researchers are working on ways to keep solver markets open, private and resistant to manipulation.