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flare-ftso

Provides integration guidance for consuming Flare Time Series Oracle price feeds onchain and offchain.

Updated Jul 31, 2026
Search Tags:#oracle#web3#solidity#wagmi#price feeds#flare#ftso
One-click install
npx skills add https://github.com/Rasslonely/NexusXRP --skill flare-ftso-rasslonely
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: flare-ftso
Source: https://github.com/Rasslonely/NexusXRP/tree/main/.agents/skills/flare-ftso
Command: npx skills add https://github.com/Rasslonely/NexusXRP --skill flare-ftso-rasslonely

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires web3, @flarenetwork/flare-periphery-contract-artifacts, and includes scripts (resource) and references (resource) components.

What problem does it solve? Developers building on Flare Network need accurate, up-to-date knowledge of the FTSO oracle's feed IDs, contract interfaces, fee mechanics, and verification patterns to integrate decentralized price feeds without hardcoding addresses or misusing payable methods. ## Core Features & Use Cases - Feed Consumption Patterns: Explains how to read block-latency and Scaling anchor feeds via FtsoV2Interface in Solidity, offchain with web3/ethers, and in React frontends using wagmi and the Flare periphery packages. - Feed IDs and Fee Calculation: Documents the 21-byte feed ID encoding, common crypto/USD feed IDs, and fee calculation via IFeeCalculator for payable calls. - Anchor Feed Verification: Covers Merkle proof verification of Scaling feeds with verifyFeedData, plus volatility incentives and delegation mechanics. - Use Case: A developer building a DeFi vault on Flare needs the XRP/USD price onchain; this Skill explains resolving FtsoV2 via ContractRegistry, calling getFeedByIdInWei with the correct feed ID, and converting the result to a human-readable price. ## Quick Start Ask the AI to show how to read the FLR/USD price feed from the Flare FTSO in a Solidity contract on Coston2 testnet.

Frequently Asked Questions about flare-ftso

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I read FTSO price feeds in a Solidity contract?▼

Resolve the FtsoV2 contract via ContractRegistry (getTestFtsoV2 on Coston2, getFtsoV2 on mainnet), then call getFeedById or getFeedsById with the 21-byte feed ID. Never hardcode the FtsoV2 address, and set the EVM version to cancun when compiling.

How to read Flare FTSO feeds offchain with JavaScript?▼

Use web3 or ethers to call the FtsoV2 contract through a Flare RPC endpoint, resolving the address at runtime via ContractRegistry's getContractAddressByName. The @flarenetwork/flare-periphery-contract-artifacts package provides the ABI via interfaceToAbi.

What is the feed ID format for Flare FTSO price feeds?▼

Each feed uses a 21-byte (bytes21) ID: a category byte (e.g. 0x01 for crypto) followed by the UTF-8 encoded ticker pair right-padded with zeros. For example, FLR/USD is 0x01464c522f55534400000000000000000000000000.

Does reading FTSO block-latency feeds cost gas or fees?▼

Block-latency feed view calls are free to query onchain. Some state-changing payable calls require a fee calculated via IFeeCalculator's calculateFeeByIds, and Scaling anchor feeds are free to query with minimal gas for onchain Merkle verification.

How do I verify Scaling anchor feed data onchain?▼

Call ftsoV2.verifyFeedData with a FeedDataWithProof struct containing the feed data (votingRoundId, id, value, turnoutBIPS, decimals) and its Merkle proof. This validates the value against the onchain Merkle root published each 90-second voting epoch.

Can I use FTSO feeds in a React frontend with wagmi?▼

Yes, use wagmi with @flarenetwork/flare-wagmi-periphery-package, which exports chain configs, ABIs, and the ContractRegistry address. Resolve FtsoV2 via getContractAddressByName, then call getFeedByIdInWei with useReadContract and format results with viem's formatUnits.

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