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Copy file name to clipboardExpand all lines: basics/how-storage-works/filecoin-plus.md
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---
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description: >-
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Learn how the Filecoin Plus program works, how DataCap is obtained and used by
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clients, and how allocators verify that the data clients want to store with a
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Filecoin storage provider is useful.
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---
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# Filecoin plus
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## What is Filecoin Plus?
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Quality Adjusted Power is an assigned rating to a given [sector](https://spec.filecoin.io/systems/filecoin\_mining/sector/), the basic unit of storage on the Filecoin network. Quality Adjusted Power is a function of a number of features of the sector, including, but not limited to, the sector’s size and promised duration, and whether the sector includes a Filecoin+ deal. It's clear to the network that a sector includes a Filecoin Plus deal if a deal in that sector involves DataCap paid to the storage provider. The more Filecoin Plus verified data the storage provider has in a sector, the higher the Quality-Adjusted Power a storage provider has, which linearly increases the number of votes a miner has in the [Secret Leader Election](https://spec.filecoin.io/algorithms/expected\_consensus/), determining which storage provider gets to serve as the verifier for the next block in the blockchain, and thus increasing the probability the storage provider is afforded the opportunity to earn block rewards. For more details on Quality Adjusted Power, see the [Filecoin specification](https://spec.filecoin.io/systems/filecoin\_blockchain/storage\_power\_consensus/).
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\[!IMPORTANT] There is a common misconception that a Filecoin Plus deal increases the miner’s reward paid to a Filecoin storage provider by a factor of ten. This is not true, Filecoin+ does not increase the amount of block rewards available to storage providers. Including Filecoin Plus deals in a sector increases the Quality Adjusted Power of a storage provider, which increases the probability a storage provider is selected as the block verifier for the next block on the Filecoin blockchain, and thus increases the probability they earn block rewards.
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#### Important
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There is a common misconception that a Filecoin Plus deal increases the miner’s reward paid to a Filecoin storage provider by a factor of ten. This is not true, Filecoin+ does not increase the amount of block rewards available to storage providers. Including Filecoin Plus deals in a sector increases the Quality Adjusted Power of a storage provider, which increases the probability a storage provider is selected as the block verifier for the next block on the Filecoin blockchain, and thus increases the probability they earn block rewards.
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Consider first a network with ten storage providers. Initially, each storage provider has an equal 10% probability of winning available block rewards in a given period:
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Incentives for storage providers to accept verified deals is strongest initially. As more and more storage providers include verified deals in their sectors, the probability any one of them earns the block rewards returns to an equal chance.
As seen in the diagrams above, Filecoin Plus increases the collateral requirements needed by a storage provider. As a higher percentage of storage providers include verified deals in their sectors, the collateral needed by each storage provider will increase. To learn more about storage provider collateral, see [this link](https://docs.filecoin.io/storage-providers/filecoin-economics/fil-collateral).
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* Clients are participants in the Filecoin network who store data with a storage provider. A trusted client, as determined by an allocator who performs due diligence on the client and the data they are looking to store, will be given DataCap by the allocator. Clients offer to give this DataCap to a storage provider as part of a deal, which increases the “deal quality multiplier” of the deal, and in turn the likelihood a storage provider will accept the deal.
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* Storage providers who receive DataCap as part of a deal are able to use this DataCap to increase their “quality adjusted power” of the storage provider on the network by a factor of ten. As described above, this increases their probability of being selected as the verifier for a block, affording them the opportunity to earn block rewards.
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## How Filecoin Plus Works
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A visualization of the interactions between parties involved in a Filecoin+ deal described above is shown below in Figure 1.
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Figure 1 | Diagram showing participant interactions in a Filecoin+ deal.
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## Acquiring DataCap for Clients & Builders
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Clients can secure DataCap by making a request to an allocator. Each one of the allocators maintain their own applications for requesting DataCap.
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One such allocator is [Filecoin Incentive Design Labs (FIDL)](https://www.fidl.tech). They maintain a [Github repository](https://github.com/fidlabs) that includes an [application](https://github.com/fidlabs/Open-Data-Pathway/issues/new/choose) where clients can make a request of FIDL for DataCap. Clients and builders looking to acquire DataCap may consider applying directly with FIDL, noting that all DataCap applications are transparent and open for public review on the [issues page](https://github.com/fidlabs/Open-Data-Pathway/issues).
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### Steps to Acquire Mainnet DataCap as a Client
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The steps a client should follow to acquire DataCap are as follows:
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1. Create a [Filecoin wallet](https://docs.filecoin.io/basics/assets/wallets).
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4. Submit an application for DataCap from an allocator. You can submit a request to FIDL via their [Github application form](https://github.com/fidlabs/Open-Data-Pathway/issues/new/choose) or [Google Form](https://www.fidl.tech/apply-for-datacap).
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5. Use the DataCap in a storage deal.
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### Steps to Acquire Testnet DataCap as a Builder
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For builders on the [Calibration testnet](../../networks/calibration/) who need testnet DataCap to test their applications, a faucet is available. The steps a builder should follow to acquire testnet DataCap are as follows:
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1. Create a wallet on Filecoin Calibration testnet. For more information, see the [Calibration docs](../../networks/calibration/) or [Github](https://github.com/filecoin-project/testnet-calibration).
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2. Grant the wallet address DataCap by using this [faucet](https://faucet.calibnet.chainsafe-fil.io/datacap.html).
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## **Smart contracts**
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## **DataCap for Smart contracts**
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Smart contracts can acquire and use DataCap just like any regular client. To do so, simply enter the `f410` address of the smart contract as the client address when making a request for DataCap.
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\[!Important] It’s important to note that DataCap allocations are a one-time credit for a Filecoin address and cannot be transferred between smart contracts. If you need to redeploy the smart contract, you must request additional DataCap.
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## Spend DataCap
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### Important
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It’s important to note that DataCap allocations are a one-time credit for a Filecoin address and cannot be transferred between smart contracts. If you need to redeploy the smart contract, you must request additional DataCap.
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## How to Use DataCap
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Once you have an address with DataCap, you can make deals using DataCap as a part of the payment. Because storage providers receive a deal quality multiplier for taking Filecoin+ deals, many storage providers offer special pricing and services to attract clients who use DataCap to make deals.
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[Learn more about Storage Deals.](https://docs.filecoin.io/storage-providers/filecoin-deals/storage-deals)
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By default, when you make a deal with an address with DataCap allocated, you will spend that DataCap when making the deal.
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### How to Use DataCap, using the API
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If making deals through the [API](https://github.com/filecoin-project/lotus/blob/master/documentation/en/api-v0-methods.md#ClientStartDeal), make sure that the `VerifiedDeal` parameter is set to `true` when calling `ClientStartDeal`.
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```json
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]
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```
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### How to Use DataCap, using the Command Line
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If making deals from the command line, make sure to pass the flag `--verified-deal=true` as a parameter.
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```shell
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lotus client deal --verified-deal=true
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```
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### Checking remaining DataCap balance
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### Checking DataCap Balance
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Once you have received DataCap to an address, you can check the remaining balance by querying your address on a node.
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#### With the lotus cli
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Run the following command, replacing "f0000" with your Filecoin address.
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```shell
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lotus filplus check-client-datacap f00000
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```
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## Visualizing the Blockchain Data for Filecoin+
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## Visualizing Blockchain Data for Filecoin+
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There are three resources you can use to check the current status of the Filecoin+ deals and participants:
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