# Staking Tiers

As with all reference rates, Vinter has different series of staking rates. As of 2023/05/25, the following starking rates series are being calculated. 

<table><thead><tr><th width="107.33333333333331">Series</th><th>Data Source</th><th>Symbol Example</th></tr></thead><tbody><tr><td>1</td><td>Tier 1, on-chain data</td><td>eth-apr-1-d</td></tr><tr><td>2</td><td>Tier 2, staking providers</td><td>eth-apr-2-d</td></tr><tr><td>3</td><td>Tier 3, exchanges</td><td>eth-apy-3-d</td></tr></tbody></table>

Vinter provides the Annual Percentage Yield (APY) and Annual Percentage Rate (APR). Symbols containing "apr" correspond to the staking APR; if they contain "apy" the value is the asset's staking APY.

### Data Sources

Each data source/provider is categorized into a three-tier system which accounts for the quality and reliability of the data feed it provides. Each tier is explained more thoroughly in its own subpage.

* [On-Chain Tier](/formerly-vinter-indices/api/staking-yield-reference-rates/staking-tiers/on-chain-tier.md): These sources offer non-aggregated blockchain, which allows calculating the Annual Percentage Rate (APR) for each validator.
* [Staking Provider Tier](/formerly-vinter-indices/api/staking-yield-reference-rates/staking-tiers/staking-provider-tier.md): Corporate entities / Decentralized Autonomous Organizations (DAO) that provide validator services:
* [Exchanges Tier](/formerly-vinter-indices/api/staking-yield-reference-rates/staking-tiers/exchange-tier.md):  Some exchanges (like Kraken, Coinbase, and Binance) offer staking as a service. However, the terms differ from the previous category since reward rates are lower and lock-up periods shorter.

Each series is created by selecting one or multiple provider categories. Filtering conditions can also be applied, such as only considering providers who have updated their rates in the last 7 days.

Examples of different data sources.

| Serial Number | Description             | Examples                        |
| ------------- | ----------------------- | ------------------------------- |
| 1             | On-chain providers only | ankr; publicnodes               |
| 2             | Staking Providers only  | infstones; everstake            |
| 3             | Exchanges only          | kraken staking; binance staking |


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