# SDK Core

The `ConstantFlowAgreementV1` class provides access to the `ConstantFlowAgreementV1` smart contract, allowing you to create/update/delete flows, update ACL permissions for an operator and modify flows on behalf of another account as an operator. You can access this class via the `Framework` class (`sf.cfaV1`) or initialize this as a standalone class.

## Accessing the CFAv1 Contract

**Using SDK Core Framework Object**

```typescript
// refresher on initializing the Framework
import { Framework } from "@superfluid-finance/sdk-core";
import { ethers } from "ethers";

const sf = await Framework.create({
  chainId: 137,
  provider
});

// access the cfaV1 object and get a flow via the created Framework class
const flowInfo = await sf.cfaV1.getFlow({
  superToken: "0x...",
  sender: "0x...",
  receiver: "0x...",
  providerOrSigner: "0x..."
});
```

**Direct Initialization**

```typescript
import { ConstantFlowAgreementV1 } from "@superfluid-finance/sdk-core";

const hostAddress = "0x3E14dC1b13c488a8d5D310918780c983bD5982E7";
const cfaV1Address = "0x6EeE6060f715257b970700bc2656De21dEdF074C";
const cfaV1ForwarderAddress = "0xcfA132E353cB4E398080B9700609bb008eceB125";

const cfaV1 = new ConstantFlowAgreementV1(hostAddress, cfaV1Address, cfaV1ForwarderAddress);
// get a flow via the standalone ConstantFlowAgreementV1 class
const flowInfo = await cfaV1.getFlow({
  superToken: "0x...",
  sender: "0x...",
  receiver: "0x...",
  providerOrSigner: "0x..."
});
```

## **Methods**

### **Read Methods**

[`getFlow`](/superfluid/developers/constant-flow-agreement-cfa/cfa-operations/read-methods/getflow.md): Get data on a stream between two accounts

[`getNetFlow`](/superfluid/developers/constant-flow-agreement-cfa/cfa-operations/read-methods/getnetflow.md): Get the net flow rate of an account for a certain Super Token

[`getAccountFlowInfo`](/superfluid/developers/constant-flow-agreement-cfa/cfa-operations/read-methods/getaccountflowinfo.md): Get summed flow data of an account for a certain Super Token

### **Write Methods**

#### **Create, Update, Delete**

[`createFlow`](/superfluid/developers/constant-flow-agreement-cfa/cfa-operations/write-methods/createflow.md): Starts a stream from a sender to a chosen receiver 

[`updateFlow`](/superfluid/developers/constant-flow-agreement-cfa/cfa-operations/write-methods/updateflow.md): Updates an existing stream from a sender to a chosen receiver

[`deleteFlow`](/superfluid/developers/constant-flow-agreement-cfa/cfa-operations/write-methods/deleteflow.md): Cancels an existing stream from a sender to a chosen receiver

#### **Create, Update, Delete with ACL Permissions**

[`createFlowByOperator`](/superfluid/developers/constant-flow-agreement-cfa/cfa-access-control-list-acl/sdk-core/createflowbyoperator.md): Starts a stream between two accounts using ACL permissions

[`updateFlowByOperator`](/superfluid/developers/constant-flow-agreement-cfa/cfa-access-control-list-acl/sdk-core/updateflowbyoperator.md): Updates a stream between two accounts using ACL permissions 

[`deleteFlowByOperator`](/superfluid/developers/constant-flow-agreement-cfa/cfa-access-control-list-acl/sdk-core/deleteflowbyoperator.md): Deletes a stream between two accounts using ACL permissions

#### **Manage ACL Permissions**

[`updateFlowOperatorPermissions`](/superfluid/developers/constant-flow-agreement-cfa/cfa-access-control-list-acl/sdk-core/updateflowoperatorpermissions.md): Lets a sender set the ACL permissions of another account

[`revokeFlowOperatorPermissions`](/superfluid/developers/constant-flow-agreement-cfa/cfa-access-control-list-acl/sdk-core/revokeflowoperatorpermissions.md): Revokes all ACL permissions that an account has over the sender's account

## **Example Usage**

```typescript
import { Framework } from "@superfluid-finance/sdk-core";
import { ethers } from "ethers";

const provider = new ethers.providers.InfuraProvider(
  "matic",
  "<INFURA_API_KEY>"
);

const sf = await Framework.create({
  chainId: 137,
  provider
});

const daix = await sf.loadSuperToken("DAIx");

// Read example
const flowInfo = await daix.getFlow({
  sender: "0x...",
  receiver: "0x...",
  providerOrSigner: provider
});
console.log("flowInfo", flowInfo);

// Write operation example
const signer = sf.createSigner({ privateKey: "<TEST_ACCOUNT_PRIVATE_KEY>", provider });
const createFlowOperation = daix.createFlow({
  sender: "0x...",
  receiver: "0x...",
  flowRate: "1000000000"
});
const txnResponse = await createFlowOperation.exec(signer);
const txnReceipt = await txnResponse.wait();
// Transaction Complete when code reaches here
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://superfluid.gitbook.io/superfluid/developers/constant-flow-agreement-cfa/cfa-operations.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.