Anchor Feeds
Scaling's anchor feeds update every 90 seconds with each new voting epoch on Flare. These feeds, accessible offchain, support various asset classes including equities, commodities, and cryptocurrencies.
Each anchor feed is uniquely identified by an ID composed of three components in a structured encoding process:
-
Category: Indicates the type of asset:
- Crypto:
01 - Forex:
02 - Commodity:
03 - Stock:
04
- Crypto:
-
Hex-Encoded Feed Name: The name of the feed is converted to a hexadecimal format.
-
Zero Padding: The combined category and hex-encoded feed name are padded with zeros to a length of 21 bytes.
The resulting string is then prefixed with 0x.
Example of the structured encoding process.
Taking the feed name FLR/USD:
- Category:
01(Crypto) - Hex-Encoded Feed Name:
464c522f555344(hexadecimal representation ofFLR/USD) - Zero Padding: The category and hex-encoded feed name combined and padded:
01464c522f55534400000000000000000000000000 - Final ID: Adding the
0xprefix results in0x01464c522f55534400000000000000000000000000
- Solidity
- Javascript
- Python
- Rust
- Go
GetFeedId.sol
// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;
import {ContractRegistry} from "@flarenetwork/flare-periphery-contracts/coston2/ContractRegistry.sol";
import {IFtsoFeedIdConverter} from "@flarenetwork/flare-periphery-contracts/coston2/IFtsoFeedIdConverter.sol";
contract GetFeedId {
IFtsoFeedIdConverter internal feedIdConverter;
constructor() {
feedIdConverter = ContractRegistry.getFtsoFeedIdConverter();
}
function exampleFlrUsdConversion() external view returns (bytes21) {
return feedIdConverter.getFeedId(1, "FLR/USD");
}
}
get_feed_id.js
function getFeedId(category, feedName) {
const hexFeedName = Array.from(feedName)
.map((c) => c.charCodeAt(0).toString(16).padStart(2, "0"))
.join("");
const paddedHexString = (category + hexFeedName).padEnd(42, "0");
return `0x${paddedHexString}`;
}
const feedId = getFeedId("01", "FLR/USD");
console.log(feedId);
get_feed_id.py
def get_feed_id(category: str, feed_name: str) -> str:
hex_feed_name = feed_name.encode("utf-8").hex()
padded_hex_string = (category + hex_feed_name).ljust(42, "0")
return f"0x{padded_hex_string}"
feed_id = get_feed_id("01", "FLR/USD")
print(feed_id)
get_feed_id.rs
fn get_feed_id(category: &str, feed_name: &str) -> String {
let hex_feed_name = feed_name
.as_bytes()
.iter()
.map(|byte| format!("{:02x}", byte))
.collect::<Vec<String>>()
.join("");
let combined = format!("{}{}", category, hex_feed_name);
let padded_hex_string = format!("{:0<42}", combined);
format!("0x{}", padded_hex_string)
}
fn main() {
let feed_id = get_feed_id("01", "FLR/USD");
println!("{}", feed_id);
}
get_feed_id.go
package main
import (
"encoding/hex"
"fmt"
"strings"
)
func getFeedID(category, feedName string) string {
hexFeedName := hex.EncodeToString([]byte(feedName))
paddedHexString := category + hexFeedName
if len(paddedHexString) < 42 {
paddedHexString = paddedHexString + strings.Repeat("0", 42-len(paddedHexString))
}
feedId := "0x" + paddedHexString
fmt.Println(feedId)
return feedId
}
🚦 Understanding feed risks.
When building applications, developers must carefully evaluate the quality of the data they use. As a developer, you are responsible for identifying and assessing the accuracy, availability, and overall quality of the data you choose to integrate. It is important to understand that all data feeds carry inherent risks.
The table below categorizes feeds into three risk levels based on their market integrity, ranging from lowest to highest, a feed is assigned a higher risk level if it fails to meet all the criteria required for classification within a lower risk level:
| Aspect | 🟢 Low Risk | 🟡 Medium Risk | 🔴 High Risk |
|---|---|---|---|
| Intrinsic Volatility | Low, stable price trends | Moderate price fluctuations | High, frequent price swings |
| Liquidity Variation | Abundant and consistent | Sufficient but variable | Limited and inconsistent |
| Liquidity Concentration | Broad and well-distributed across venues | Somewhat concentrated | Highly concentrated in a few sources |
| Asset Spread Risk | Tight spreads, minimal bid-ask gaps | Moderate spreads, acceptable bid-ask gaps | Wide spreads, significant bid-ask gaps |
| Cross Rate Risk | Low correlation, direct pricing available | Moderate correlation, indirect pricing used | High correlation, dependent on multiple intermediaries |
Other risk categories:
- âš« New Feed New tokens lack historical data for proper risk assessment and stable price discovery. Users must recognize these assets carry higher volatility risks and verify feed reliability independently. After a monitoring period, feeds will be assigned risk levels or potentially discontinued.
Each feed undergoes a rigorous assessment process prior to deployment. The evaluation criteria may vary depending on the specific type of feed being implemented and can evolve over time as our understanding of market integrity risks improves.
warning
Feed IDs are not addresses. They are bytes21 structured encodings that combine the category and feed name to ensure each feed has a unique identifier.
| Name | Feed ID | Details | Risk |
|---|---|---|---|
| FLR/USD | 0x01464c522f55534400000000000000000000000000 | Base Asset: Flare Category: Crypto | 🟢 |
| SGB/USD | 0x015347422f55534400000000000000000000000000 | Base Asset: Songbird Category: Crypto | 🟡 |
| BTC/USD | 0x014254432f55534400000000000000000000000000 | Base Asset: Bitcoin Category: Crypto | 🟢 |
| XRP/USD | 0x015852502f55534400000000000000000000000000 | Base Asset: XRP Category: Crypto | 🟢 |
| LTC/USD | 0x014c54432f55534400000000000000000000000000 | Base Asset: Litecoin Category: Crypto | 🟢 |
| XLM/USD | 0x01584c4d2f55534400000000000000000000000000 | Base Asset: Stellar Category: Crypto | 🟢 |
| DOGE/USD | 0x01444f47452f555344000000000000000000000000 | Base Asset: Dogecoin Category: Crypto | 🟢 |
| ADA/USD | 0x014144412f55534400000000000000000000000000 | Base Asset: Cardano Category: Crypto | 🟢 |
| ALGO/USD | 0x01414c474f2f555344000000000000000000000000 | Base Asset: Algorand Category: Crypto | 🟢 |
| ETH/USD | 0x014554482f55534400000000000000000000000000 | Base Asset: Ethereum Category: Crypto | 🟢 |
| FIL/USD | 0x0146494c2f55534400000000000000000000000000 | Base Asset: Filecoin Category: Crypto | 🟢 |
| ARB/USD | 0x014152422f55534400000000000000000000000000 | Base Asset: Arbitrum Category: Crypto | 🟢 |
| AVAX/USD | 0x01415641582f555344000000000000000000000000 | Base Asset: Avalanche Category: Crypto | 🟢 |
| BNB/USD | 0x01424e422f55534400000000000000000000000000 | Base Asset: BNB Category: Crypto | 🟢 |
| POL/USD | 0x01504f4c2f55534400000000000000000000000000 | Base Asset: POL (ex-MATIC) Category: Crypto | 🟢 |
| SOL/USD | 0x01534f4c2f55534400000000000000000000000000 | Base Asset: Solana Category: Crypto | 🟢 |
| USDC/USD | 0x01555344432f555344000000000000000000000000 | Base Asset: USDC Category: Crypto | 🟢 |
| USDT/USD | 0x01555344542f555344000000000000000000000000 | Base Asset: Tether Category: Crypto | 🟢 |
| XDC/USD | 0x015844432f55534400000000000000000000000000 | Base Asset: XDC Network Category: Crypto | 🟡 |
| TRX/USD | 0x015452582f55534400000000000000000000000000 | Base Asset: TRON Category: Crypto | 🟢 |
| LINK/USD | 0x014c494e4b2f555344000000000000000000000000 | Base Asset: Chainlink Category: Crypto | 🟢 |
| ATOM/USD | 0x0141544f4d2f555344000000000000000000000000 | Base Asset: Cosmos Hub Category: Crypto | 🟢 |
| DOT/USD | 0x01444f542f55534400000000000000000000000000 | Base Asset: Polkadot Category: Crypto | 🟢 |
| TON/USD | 0x01544f4e2f55534400000000000000000000000000 | Base Asset: Toncoin Category: Crypto | 🟢 |
| ICP/USD | 0x014943502f55534400000000000000000000000000 | Base Asset: Internet Computer Category: Crypto | 🟢 |
| SHIB/USD | 0x01534849422f555344000000000000000000000000 | Base Asset: Shiba Inu Category: Crypto | 🟢 |
| USDS/USD | 0x01555344532f555344000000000000000000000000 | Base Asset: USDS Category: Crypto | 🟢 |
| BCH/USD | 0x014243482f55534400000000000000000000000000 | Base Asset: Bitcoin Cash Category: Crypto | 🟢 |
| NEAR/USD | 0x014e4541522f555344000000000000000000000000 | Base Asset: NEAR Protocol Category: Crypto | 🟢 |
| LEO/USD | 0x014c454f2f55534400000000000000000000000000 | Base Asset: LEO Token Category: Crypto | 🔴 |
| UNI/USD | 0x01554e492f55534400000000000000000000000000 | Base Asset: Uniswap Category: Crypto | 🟢 |
| ETC/USD | 0x014554432f55534400000000000000000000000000 | Base Asset: Ethereum Classic Category: Crypto | 🟢 |
| WIF/USD | 0x015749462f55534400000000000000000000000000 | Base Asset: dogwifhat Category: Crypto | 🟢 |
| BONK/USD | 0x01424f4e4b2f555344000000000000000000000000 | Base Asset: Bonk Category: Crypto | 🟢 |
| JUP/USD | 0x014a55502f55534400000000000000000000000000 | Base Asset: Jupiter Category: Crypto | 🟢 |
| ETHFI/USD | 0x0145544846492f5553440000000000000000000000 | Base Asset: Ether.fi Category: Crypto | 🟢 |
| ENA/USD | 0x01454e412f55534400000000000000000000000000 | Base Asset: Ethena Category: Crypto | 🟢 |
| PYTH/USD | 0x01505954482f555344000000000000000000000000 | Base Asset: Pyth Network Category: Crypto | 🟢 |
| HNT/USD | 0x01484e542f55534400000000000000000000000000 | Base Asset: Helium Category: Crypto | 🟡 |
| SUI/USD | 0x015355492f55534400000000000000000000000000 | Base Asset: Sui Category: Crypto | 🟢 |
| PEPE/USD | 0x01504550452f555344000000000000000000000000 | Base Asset: Pepe Category: Crypto | 🟢 |
| QNT/USD | 0x01514e542f55534400000000000000000000000000 | Base Asset: Quant Category: Crypto | 🟢 |
| AAVE/USD | 0x01414156452f555344000000000000000000000000 | Base Asset: Aave Category: Crypto | 🟢 |
| S/USD | 0x01532f555344000000000000000000000000000000 | Base Asset: Sonic (prev. FTM) Category: Crypto | 🟡 |
| ONDO/USD | 0x014f4e444f2f555344000000000000000000000000 | Base Asset: Ondo Category: Crypto | 🟢 |
| TAO/USD | 0x0154414f2f55534400000000000000000000000000 | Base Asset: Bittensor Category: Crypto | 🟢 |
| FET/USD | 0x014645542f55534400000000000000000000000000 | Base Asset: Artificial Superintelligence Alliance Category: Crypto | 🟢 |
| RENDER/USD | 0x0152454e4445522f55534400000000000000000000 | Base Asset: Render Category: Crypto | 🟢 |
| NOT/USD | 0x014e4f542f55534400000000000000000000000000 | Base Asset: Notcoin Category: Crypto | 🟡 |
| RUNE/USD | 0x0152554e452f555344000000000000000000000000 | Base Asset: THORChain Category: Crypto | 🟡 |
| TRUMP/USD | 0x015452554d502f5553440000000000000000000000 | Base Asset: Official Trump Category: Crypto | 🟡 |
| USDX/USD | 0x01555344582f555344000000000000000000000000 | Base Asset: Hex Trust USD Category: Crypto | 🟢 |
| JOULE/USD | 0x014a4f554c452f5553440000000000000000000000 | Base Asset: Joule Category: Crypto | âš« |
| HBAR/USD | 0x01484241522f555344000000000000000000000000 | Base Asset: Hedera Category: Crypto | 🟢 |
| PENGU/USD | 0x0150454e47552f5553440000000000000000000000 | Base Asset: Pudgy Penguins Category: Crypto | 🟢 |
| HYPE/USD | 0x01485950452f555344000000000000000000000000 | Base Asset: Hyperliquid Category: Crypto | 🟢 |
| APT/USD | 0x014150542f55534400000000000000000000000000 | Base Asset: Aptos Category: Crypto | 🟢 |
| PAXG/USD | 0x01504158472f555344000000000000000000000000 | Base Asset: PAX Gold Category: Crypto | 🟡 |
| BERA/USD | 0x01424552412f555344000000000000000000000000 | Base Asset: Berachain Category: Crypto | 🔴 |