Add off-chain feed query guide

docs/2-network.mdx

@@ -17,7 +17,7 @@ Flare has four networks, each serving different purposes, so choosing the right
 
 - **Songbird Canary-Network.** Experimental proving ground for Flare, test your applications in a real-world environment.
 
-- **Songbird Testnet Coston.** This is the testnet for the Songbird network.
+- **Songbird Testnet Coston.** The testnet for Songbird network.
 
 The most common development tracks are:
 

docs/ftso/guides/read-feeds-offchain.mdx

@@ -9,7 +9,11 @@ sidebar_position: 1
 import TabItem from "@theme/TabItem";
 import Tabs from "@theme/Tabs";
 
-This guide contains code examples that demonstrate how to read FTSOv2 feeds off-chain using different programming languages.
+This guide contains code examples that demonstrate how to read FTSOv2 feeds off-chain using different programming languages. To read a block-latency feed off-chain you need two pieces of information:
+
+1. **RPC Endpoint URL:** This determines which network that code will interact with. You can use a node provider service or point to your own client. A list of public and private RPC endpoints for all Flare networks is provided on the [Network Configuration](../../network#configuration) page.
+
+2. **FastUpdater Contract Address:** The address for the `FastUpdater` contract is different for each network. You can query this by calling the `FlareContractRegistry`, which has the same address across all Flare networks `0xaD67FE66660Fb8dFE9d6b1b4240d8650e30F6019`. Examples for how to query the `FlareContractRegistry` are given in the language guides using [Python](/guides/flare-for-python-developers#make-query), [Rust](/guides/flare-for-rust-developers#make-query), [JavaScript](/guides/flare-for-javascript-developers#make-query), and [Go](/guides/flare-for-go-developers#make-query).
 
 ## Python
 
@@ -37,7 +41,7 @@ import asyncio
 from web3 import AsyncHTTPProvider, AsyncWeb3
 
 # FastUpdater address (Songbird Testnet Coston)
-FTSO_ADDRESS = "0x9B931f5d3e24fc8C9064DB35bDc8FB4bE0E862f9"
+ADDRESS = "0x9B931f5d3e24fc8C9064DB35bDc8FB4bE0E862f9"
 RPC_URL = "https://rpc.ankr.com/flare_coston"
 # Feed indexes: 0 = FLR/USD, 2 = BTC/USD, 9 = ETH/USD
 FEED_INDEXES = [0, 2, 9]
@@ -49,7 +53,7 @@ async def main() -> None:
     # Connect to an RPC node
     w3 = AsyncWeb3(AsyncHTTPProvider(RPC_URL))
     # Set up contract instance
-    ftsov2 = w3.eth.contract(address=FTSO_ADDRESS, abi=ABI)
+    ftsov2 = w3.eth.contract(address=ADDRESS, abi=ABI)
     # Fetch current feeds
     feeds, decimals, timestamp = await ftsov2.functions.fetchCurrentFeeds(
       FEED_INDEXES
@@ -90,7 +94,7 @@ This example shows two ways, one using [web3.js](https://github.com/web3/web3.js
     import { Web3 } from "web3";
 
     // FastUpdater address (Songbird Testnet Coston)
-    const FTSO_ADDRESS = "0x9B931f5d3e24fc8C9064DB35bDc8FB4bE0E862f9";
+    const ADDRESS = "0x9B931f5d3e24fc8C9064DB35bDc8FB4bE0E862f9";
     const RPC_URL = "https://rpc.ankr.com/flare_coston";
     // Feed indexes: 0 = FLR/USD, 2 = BTC/USD, 9 = ETH/USD
     const FEED_INDEXES = [0, 2, 9];
@@ -102,7 +106,7 @@ This example shows two ways, one using [web3.js](https://github.com/web3/web3.js
       // Connect to an RPC node
       const w3 = new Web3(RPC_URL);
       // Set up contract instance
-      const ftsov2 = new w3.eth.Contract(ABI, FTSO_ADDRESS);
+      const ftsov2 = new w3.eth.Contract(ABI, ADDRESS);
       // Fetch current feeds
       const res = await ftsov2.methods.fetchCurrentFeeds(FEED_INDEXES).call();
       // Log results
@@ -122,7 +126,7 @@ This example shows two ways, one using [web3.js](https://github.com/web3/web3.js
     import { ethers } from "ethers";
 
     // FastUpdater address (Songbird Testnet Coston)
-    const FTSO_ADDRESS = "0x9B931f5d3e24fc8C9064DB35bDc8FB4bE0E862f9";
+    const ADDRESS = "0x9B931f5d3e24fc8C9064DB35bDc8FB4bE0E862f9";
     const RPC_URL = "https://rpc.ankr.com/flare_coston";
     // Feed indexes: 0 = FLR/USD, 2 = BTC/USD, 9 = ETH/USD
     const FEED_INDEXES = [0, 2, 9];
@@ -134,7 +138,7 @@ This example shows two ways, one using [web3.js](https://github.com/web3/web3.js
       // Connect to an RPC node
       const provider = new ethers.JsonRpcProvider(RPC_URL);
       // Set up contract instance
-      const ftsov2 = new ethers.Contract(FTSO_ADDRESS, ABI, provider);
+      const ftsov2 = new ethers.Contract(ADDRESS, ABI, provider);
       // Fetch current feeds
       const res = await ftsov2.fetchCurrentFeeds(FEED_INDEXES);
       // Log results
@@ -174,14 +178,14 @@ sol!(
 #[tokio::main]
 async fn main() -> Result<()> {
     // FastUpdater address (Songbird Testnet Coston)
-    let ftso_address = "0x9B931f5d3e24fc8C9064DB35bDc8FB4bE0E862f9".parse()?;
+    let address = "0x9B931f5d3e24fc8C9064DB35bDc8FB4bE0E862f9".parse()?;
     let rpc_url = "https://rpc.ankr.com/flare_coston".parse()?;
     // Feed indexes: 0 = FLR/USD, 2 = BTC/USD, 9 = ETH/USD
     let feed_indexes = vec![U256::from(0_u32), U256::from(2_u32), U256::from(9_u32)];
     // Connect to an RPC node
     let provider = ProviderBuilder::new().on_http(rpc_url);
     // Set up contract instance
-    let ftsov2 = FtsoV2::new(ftso_address, provider);
+    let ftsov2 = FtsoV2::new(address, provider);
     // Fetch current feeds
     let FtsoV2::fetchCurrentFeedsReturn {
         _feeds,
@@ -226,12 +230,12 @@ import (
 
 func FtsoV2Consumer() {
 	// FastUpdater address (Songbird Testnet Coston)
-	ftsoAddress := common.HexToAddress("0x9B931f5d3e24fc8C9064DB35bDc8FB4bE0E862f9")
+	address := common.HexToAddress("0x9B931f5d3e24fc8C9064DB35bDc8FB4bE0E862f9")
 	rpcUrl := "https://rpc.ankr.com/flare_coston"
 	// Connect to an RPC node
 	client, _ := ethclient.Dial(rpcUrl)
 	// Set up contract instance
-	ftsov2, _ := NewFastUpdater(ftsoAddress, client)
+	ftsov2, _ := NewFastUpdater(address, client)
 	// Feed indexes: 0 = FLR/USD, 2 = BTC/USD, 9 = ETH/USD
 	feedIndexes := []*big.Int{big.NewInt(0), big.NewInt(2), big.NewInt(9)}
 	// Fetch current feeds

guides/2024-05-24-flare-for-go-developers.mdx

@@ -125,7 +125,7 @@ abigen --abi FlareContractRegistry.abi --pkg main --type contract --out FlareCon
 
 ### Make query
 
-You can query the `FlareContractRegistry` contract to get the addresses of other Flare contracts.
+You can now query the `FlareContractRegistry` contract to get the addresses of other Flare contracts.
 
 For example, querying it for the address of the `WNat` contract:
 

guides/2024-05-25-flare-for-javascript-developers.mdx

@@ -124,7 +124,7 @@ To fetch a contract's ABI programmatically, you can query the [Flare Blockchain
 
 ### Make query
 
-Using this `abi` you can query the `FlareContractRegistry` contract to get the addresses of other Flare contracts.
+You can now query the `FlareContractRegistry` contract to get the addresses of other Flare contracts.
 
 For example, querying it for the address of the `WNat` contract:
 

guides/2024-05-26-flare-for-rust-developers.mdx

@@ -103,7 +103,7 @@ To fetch a contract's ABI, you can use Flarescan. Copy the **Contract ABI** from
 
 ### Make query
 
-You can query the `FlareContractRegistry` contract to get the addresses of other Flare contracts.
+You can now query the `FlareContractRegistry` contract to get the addresses of other Flare contracts.
 
 For example, querying it for the address of the `WNat` contract:
 

guides/2024-05-27-flare-for-python-developers.mdx

@@ -160,7 +160,7 @@ To fetch a contract's ABI programmatically, you can query the [Flare Blockchain
 
 ### Make query
 
-Using this `abi` you can query the `FlareContractRegistry` contract to get the addresses of other Flare contracts.
+You can now query the `FlareContractRegistry` contract to get the addresses of other Flare contracts.
 
 For example, querying it for the address of the `WNat` contract: