feat: add flair indexing

SUMMARY.md

@@ -49,6 +49,7 @@
   * [Cronos Safe](for-dapp-developers/useful-projects-on-cronos/cronos-safe.md)
   * [Banxa](for-dapp-developers/useful-projects-on-cronos/banxa.md)
   * [Caldera](for-dapp-developers/dev-tools-and-integrations/caldera.md)
+  * [Flair](for-dapp-developers/dev-tools-and-integrations/flair.md)
 
 ## FOR NODE HOSTS
 

for-dapp-developers/dev-tools-and-integrations/flair.md

@@ -0,0 +1,111 @@
+---
+description: >-
+  Real-time and historical custom data indexing for any evm chain.
+---
+
+# 🔮 Flair
+Real-time and historical custom data indexing for any evm chain.
+
+[Flair](https://flair.dev) offers reusable **indexing primitives** (such as fault-tolerant RPC ingestors, custom processors, re-org aware database integrations) to make it easy to receive, transform, store and access your on-chain data.
+
+[![flair architecture](https://imgur.com/0q5bHZK.png)](https://docs.flair.dev/)
+
+
+## Why Flair?
+
+Compared to other alternatives the main reasons are:
+
+* 🚀  Adopting **parallel and distributed processing** paradigm means high scalability and resiliency for your indexing stack. Instead of constrained sequential processing (e.g Subgraph).
+* 🧩  Focused on **primitives**, which means on the left you plug-in an RPC and on the right you output the data to any destination database.
+* 🚄  Native **real-time stream processing** for certain data workload (such as aggregations, rollups) for things like total volume per pool, or total portfolio per user wallet.
+* ☁️  **Managed** cloud services avoid DevOps and irrelevant engineering costs for dApp developers.
+* 🧑‍💻  Avoid decentralization **overhead** (consensus, network hops, etc) since we believe to enable best UX for dApps reading data must be as close to the developers as possible.
+### Features
+
+* ✅ Listen to **any EVM chain** with just an RPC URL.
+  * Free managed RPC URLs for +8 popular chains already included.
+  * Works with both websocket and https-only RPCs.
+* ✅ Track and ingest **any contract** for **any event topic.**
+  * Auto-track new contracts deployed from factory contracts.
+* ✅ **Custom processor scripts** with Javascript runtime (with **Typescript** support)
+  * Make external API or Webhook calls to third-party or your backend.
+  * Get current or historical USD value of any ERC20 token amount of any contract address on any chain.
+  * Use any external NPM library.
+* ✅ **Stream** any stored data to your destination database (Postgres, MongoDB, MySQL, Kafka, Elasticsearch, Timescale, etc).
+
+## Getting Started
+
+1️⃣ Clone the [starter boilerplate](https://github.com/flair-sdk/starter-boilerplate) template and follow the instructions
+
+```bash
+git clone https://github.com/flair-sdk/starter-boilerplate.git
+# ... follow instructions in README.md
+```
+:::info
+
+Boilerplate instructions will create a **new cluster**, generate **an API Key**, and set up a manifest.yml to index your **first contract** with **sample custom processor** scripts.
+
+Learn more about the [structure of manifest.yml](https://docs.flair.dev/reference/manifest.yml).
+
+:::
+
+2️⃣ Configure Cronos RPC nodes
+
+Set a unique namespace, Cronos chainId and RPC endpoint in your config. Remember that you can add up to 10 RPC endpoints for resiliency.
+
+```yaml
+{
+  "cluster": "dev",
+  "namespace": "my-awesome-cronos-indexing-dev",
+  "indexers": [
+    {
+      "chainId": 25,
+      "enabled": true,
+      "ingestionFilterGroup": "default",
+      "processingFilterGroup": "default",
+      "sources": [
+        # Highly-recommended to have at least 1 websocket endpoint
+        "wss://XXX",
+        # You can put multiple endpoints for failover
+        "https://evm.cronos.org"
+      ]
+    }
+  ]
+}
+```
+
+3️⃣  Sync some historical data using [backfill command](https://docs.flair.dev/reference/backfilling). Remember that `enabled: true` flag in your `config` enabled your indexer to capture data in real-time already.
+
+```bash
+# backfill certain contracts or block ranges
+pnpm flair backfill --chain 25 --address 0x6911dE03899e040745bdAC855333E294B927945D -d backward --max-blocks 10000
+
+# backfill for a specific block number, if you have certain events you wanna test with
+pnpm flair backfill --chain 25 -b 10329277
+
+# backfill for the recent data in the last X minute
+pnpm flair backfill --chain 25 --min-timestamp="30 mins ago" -d backward
+```
+
+
+4️⃣ [Query](https://docs.flair.dev/#getting-started) your custom indexed data.
+
+5️⃣ Stream the data to your [own database](https://docs.flair.dev/reference/database#your-own-database).
+
+## Examples
+
+Explore real-world usage of Flair indexing primitives for various use-cases.
+
+### DeFi
+
+* [Aggregate protocol fees in USD across multiple chains](https://github.com/flair-sdk/examples/tree/main/aggregate-protocol-fees-in-usd)
+* [Calculate "Health Factor" of positions with contract factory tracking](https://github.com/flair-sdk/examples/tree/main/health-factor-with-factory-tracking)
+* [Index Uniswap v2 swaps with USD price for all addresses](https://github.com/flair-sdk/examples/tree/main/uniswap-v2-events-from-all-contracts-with-usd-price)
+
+### NFT
+
+* [Index ERC721 and ERC1155 NFTs on any EVM chain with an RPC URL](https://github.com/flair-sdk/examples/tree/main/erc721-and-erc1155-nft-indexing)
+
+## Need help?
+
+[Our engineers](https://docs.flair.dev/talk-to-an-engineer) are available to help you at any stage.