DEFI Farming Explained: How It Works

“DeFi farming” is often used as an umbrella term for activities that place digital assets into decentralized-finance applications under rules implemented partly or wholly by software. The phrase alone does not specify a particular protocol, contract, asset, or reward mechanism. Understanding a specific farming arrangement therefore requires tracing what the application does, which components it depends on, and what the user’s transaction authorizes.

This explainer focuses on that technical structure. It does not evaluate any product or describe expected returns. The available source evidence supports a general way to analyze DeFi applications, along with details about Ethereum contract interfaces and read-only calls. It does not establish that every farming application uses the same architecture or transaction sequence.

What DEFI Farming Explained means

A useful starting point is to treat DeFi farming as an interaction with an application that uses blockchain-based settlement and software-defined rules. The term may refer to supplying assets to an application or participating in another activity the application supports; the exact action and resulting position depend on the particular implementation. The evidence available here does not define one universal farming product or reward formula, so those specifics must be verified in the protocol’s own documentation and deployed contracts.

The Bank for International Settlements describes DeFi applications using a reference model with three layers: settlement, application, and interface. These layers have distinct technical dependencies, but a system can distribute or combine them differently. This model is useful for asking where an operation happens, which software determines its behavior, and how a user or service reaches it. It is not a claim that every application has three separately deployed components.

In this framing, an interface is the route through which a user or operator prepares an interaction. The application layer contains the logic that interprets supported actions, while settlement is where relevant blockchain state changes are recorded. That description is a conceptual map, not a guarantee about a particular implementation’s custody model, security, or degree of decentralization. (BIS Working Paper 1066.)

Core components of DEFI Farming Explained

A technical review should distinguish the following components rather than treating “the protocol” as a single object:

  • Interface: A website, wallet, or other client can present information and prepare an operation. Its displayed labels and balances should be checked against the underlying transaction and network state.
  • Application logic: A contract or set of contracts may define which calls are accepted and how state changes. The specific contract addresses and functions are implementation-dependent.
  • Settlement layer: The blockchain records transactions and resulting state according to its own rules. A user’s view of a position may depend on reading that state correctly.
  • Contract interface description: For EVM contracts, the Solidity Contract ABI specifies how function selectors, arguments, return values, errors, and events are encoded between applications and contracts. The application must use an ABI that matches both the deployed contract interface and the network address; an ABI by itself does not prove that a contract is the intended one. (Solidity Contract ABI Specification.)
  • Network access and observation: Ethereum’s JSON-RPC API provides methods for clients to interact with Ethereum nodes. For example, eth_call executes a message call locally against a selected block state without creating an onchain transaction. Its result is a read or simulation against that state, not a reservation of future conditions. (Ethereum JSON-RPC API.)
  • People and operational processes: Users, developers, node or RPC operators, and any service providers may each handle different parts of the workflow. Their precise roles vary by deployment and should not be inferred from the farming label.

The BIS model helps organize these components, while the ABI and JSON-RPC specifications clarify two narrower technical boundaries: how an application encodes contract interactions and how it can query or simulate calls. Neither source establishes the design of a particular farming application.

How DEFI Farming Explained works

A general interaction can be mapped as a sequence, but the exact steps, transaction types, and state changes depend on the application.

  1. Identify the intended application and network. Determine which interface is being used and which network and contract address it targets. Because the ABI must match the deployed contract interface and network address, checking only a familiar application name or function label is not enough.
  2. Inspect the proposed operation. Establish what function is being called, what arguments are supplied, and what the application says the operation will do. The ABI describes encoding for function selectors and arguments, as well as return values, errors, and events; it does not independently validate the meaning presented by an interface.
  3. Read or simulate where appropriate. A client may use eth_call to execute a message call locally against a selected block state without creating an onchain transaction. This can help inspect behavior against that state. It does not reserve state or guarantee that a later transaction will succeed if state or gas conditions change.
  4. Submit a transaction if the operation requires one. A transaction is distinct from a local eth_call: the latter does not create an onchain transaction. The exact authorization and resulting state changes depend on the call and application implementation, so users and operators need to inspect the actual transaction details rather than assume a uniform farming flow.
  5. Check the resulting state and records. After an operation, compare the onchain result with the interface’s representation. The relevant contract events, return data, and state reads may help explain what occurred, but their interpretation depends on the correct ABI, deployed address, and application design.
  6. Repeat verification as conditions change. A read or simulation refers to a selected block state. A later transaction can encounter changed state or gas conditions, so a previously successful call is not a guarantee of later success.

This sequence is an evaluation framework, not a promise that all DeFi farming activity follows these exact steps. A particular application may combine components, use different interaction patterns, or rely on additional services. Those details require application-specific evidence.

Trust and control boundaries

“Decentralized” does not, by itself, explain who controls each component or what assumptions a user is making. Separate the question into layers: Who operates the interface? Which contracts govern the relevant action? What network and address are involved? Who supplies data or connectivity? Which processes can affect upgrades, configuration, or operations? The available sources do not answer these questions for any individual farming product, so they must be checked against current implementation documentation and onchain evidence.

The distinction between local inspection and state-changing execution is especially important. eth_call can evaluate a message call against a selected block state without creating a transaction, but it does not lock in that state. An application’s successful simulation is therefore evidence about that particular call and state, not a guarantee about execution later under changed state or gas conditions.

Likewise, an ABI is an encoding specification, not proof of identity or correctness. It describes how applications and EVM contracts encode calls and related data. Its stated condition matters: the application must use an ABI matching the deployed interface and network address. A mismatch can make an interaction or its interpretation unreliable; confirming the relevant address and interface remains an implementation-specific verification task.

Limitations and failure modes

A general definition cannot establish a particular application’s behavior. The same broad label may cover different designs, so claims about supported actions, assets, rewards, custody, or operational controls need direct evidence for the implementation under review. The source material here does not support universal claims about those features.

Several technical limits follow from the cited specifications:

  • State can change after inspection. A successful eth_call is against a selected block state. It does not reserve that state or guarantee a later transaction will succeed under changed state or gas conditions.
  • Interface descriptions must match deployment. The ABI condition ties correct encoding to both the deployed contract interface and network address. A displayed interface or ABI file alone does not establish that the intended contract is being called.
  • A layer diagram is not a deployment map. The BIS settlement/application/interface model allows systems to distribute or combine layers differently. Do not assume that conceptual layers correspond one-to-one with separate teams, services, or contracts.
  • The cited sources do not prove product-level outcomes. They do not establish that a specific farming application is safe, available, recoverable, or governed in a particular way. Such conclusions require relevant, current, product-specific evidence and remain outside this general explanation.

These are verification boundaries, not a complete risk inventory for every possible application. A team should identify additional dependencies from the actual system rather than infer that the list above is exhaustive.

What teams should verify

For a technical review of a DeFi farming application, a practical evidence checklist is:

  1. System map: Document the interface, application logic, settlement network, and any external services. Note where layers are combined, since the reference model permits different distributions.
  2. Deployment identity: Record the network and contract addresses relevant to the operation. Confirm that the application’s ABI corresponds to the deployed interface and address.
  3. Call interpretation: Review function selectors, arguments, and any available return values, errors, or events using the applicable ABI. Verify that the interface’s description matches the encoded operation; the ABI specifies encoding, not the application’s business meaning.
  4. Read versus write: Identify which checks use local calls such as eth_call and which actions create onchain transactions. Record the block state used for a simulation and account for the possibility that state or gas conditions change before a later transaction.
  5. State reconciliation: Determine how the team will confirm that the resulting onchain state matches what the interface reports. Use implementation-specific documentation to interpret reads and events rather than assuming every contract follows the same pattern.
  6. Operational ownership: Establish who maintains each interface, contract, network connection, and operational process. The general architecture sources do not identify these responsibilities for a particular application.
  7. Evidence limits: Separate facts shown by specifications or current deployment evidence from assumptions about behavior. Where the evidence does not establish a feature or control, mark it as unknown and seek application-specific documentation.

The central idea is that DeFi farming is not one standardized mechanism. It is a label for interactions with applications whose interfaces, contracts, settlement networks, and operational dependencies must be examined separately. The BIS layer model offers a way to organize that examination; Solidity’s ABI specification and Ethereum’s JSON-RPC documentation explain important interface and call boundaries. Applying those sources carefully helps teams describe how a particular system works without treating a conceptual model or successful simulation as proof of broader guarantees.

Source basis: Bank for International Settlements, The Technology of Decentralized Finance (DeFi), Working Paper 1066; Solidity Documentation, Contract ABI Specification; ethereum.org, JSON-RPC API.

Sources and references