KAPI was created for easy fetching keys of all staking modules. Staking Module interface contains type that was specially designed for KAPI to easy understand that implementation it should use for working with module's keys. For example: simple-dvt-onchain-v1 -> RegistryModule curated-onchain-v1 -> RegistryModule There can be few modules with the same type. They all should have the same implementation (contract's ABI). For KAPI it means for these modules it can reuse the same algorithm for fetching and saving keys. Also different types of modules can have the same implementation as in the example above. At the moment KAPI knows only one type: curated-onchain-v1.

The main goal of new KAPI release is preparing service for supporting multiple Staking Modules. Aside from refactoring KAPI that will add support of modules we need to fix performance and memory consumption. Detailed about our suggestions around performance you can read here. At the same time we want to improve current implementation. In this document we want to explain why we decided not to change structure of database and didn't get rid of transactions. Assumptions and facts we based on Staking modules' keys, operators and meta should be stored for the same execution layer state (blockNumber, blockHash, timestamp); Update also should be an atomic operation; Api responses should contain data that was get from storage for the same execution layer state (blockNumber, blockHash, timestamp); Should be launched only one KAPI instance at once that use the same db; only KAPI can change data in db; Current version stores only one version of keys;

Summary of tooling used in Lido V2: Oracle, Ejector, Council Daemon, and Keys API. Oracle Oracle daemon for Lido decentralized staking service. Version: 3.0.0-rc.2 Docker image: sha256:85b6f33784df5c1fd76b987f2dac5422539e5ec81a921f0e33f7c167f6e3501b, lidofinance/oracle@sha256-85b6f33784df5c1fd76b987f2dac5422539e5ec81a921f0e33f7c167f6e3501b Commit hash: lidofinance/lido-oracle@e50088b Last update date: 2 May, 2023 Repository

Guides update: New block here: https://docs.lido.fi/integrations/wallets/ Here you can find various Lido APIs which you can integrate in your app or website: Lido APR API provides Ethereum and Lido staking APR, which include: Simple Moving Average Lido APR for 7 last days:

Simple Lido keys and validators HTTP API. Source code is available via link. API documentation and more information about how Keys api work is available via link. Hardware requirements Require 2 core CPU 5 GB RAMKeys-API-DB — 500MB Keys-API — 4GB EL Full node CL node for applications like Ejector that use validators API. If you use Teku client, please use archive mode.

Check logs Check locator, SR contract address, fetching modules from SR, type of module and id 2023-04-04 13:35:22 {"context":[[1,"0x9D4AF1Ee19Dad8857db3a45B0374c81c8A1C6320",500,500,10000,0,"curated-onchain-v1",{"hex":"0x642b7c30","type":"BigNumber"},{"hex":"0x85d0ad","type":"BigNumber"},{"hex":"0x1a","type":"BigNumber"}]],"level":"info","message":"Modules:"} 2023-04-04 13:35:22 {"level":"info","message":"Fetched 1 modules"} 2023-04-04 13:35:21 {"context":"0xa3Dbd317E53D363176359E10948BA0b1c0A4c820","level":"info","message":"Staking router module address"} 2023-04-04 13:35:21

Keys API алерты Репозиторий https://github.com/lidofinance/lido-keys-api/tree/main/alerts KeysApiOutdatedKeys - алерт срабатывает, если ключи не обновлялись последние 5 минут в бд Правило: time() - lido_keys_api_last_update_timestamp{} >= 5 * 60 Метрика: lido_keys_api_last_update_timestamp - значение timestamp блока за который обновлялась база ключей KeysApiOutdatedValidators - алерт срабатывает,если валидаторы не обновлялись последние 30 минут Правило: time() - lido_keys_api_validators_registry_last_update_block_timestamp{} >= 60 * 30 Метрика: lido_keys_api_validators_registry_last_update_block_timestamp - значение timestamp блока за который обновлялась база валидаторов KeysApiExecutionLayerRPCErrors - алерт срабатывает, если число запросов с ошибкой к Execution layer за последние 5 минут превышает 40