MCPInstall

chainlink-data-feeds

by hedera-dev

Chainlink Data Feeds on Hedera. Use when reading AggregatorV3 price feeds on Hedera (testnet 296 / mainnet 295), calling latestRoundData, checking round completeness and staleness, or normalizing feed decimals. Not for Chainlink CCIP (cross-chain tokens).

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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/hedera-dev/hedera-skills --skill chainlink-data-feeds
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads chainlink-data-feeds automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Chainlink Data Feeds (Hedera)

Push feed pattern: a Chainlink aggregator is updated off-chain; on-chain readers call latestRoundData() and must reject incomplete, non-positive, or stale rounds.

Chainlink DON → AggregatorV3Interface feed → consumer latestRoundData()

Consumers may wrap the feed behind a local interface; that is optional. Do not assume a project-specific adapter name.

Quick Reference

PieceRole
AggregatorV3InterfacelatestRoundData() + decimals()
Round completenessansweredInRound >= roundId and updatedAt != 0
Priceanswer > 0 (feeds are typically signed int256)
FreshnessCompare block.timestamp - updatedAt to a max staleness
ScaleNormalize feed decimals to the consumer’s scale (often 18)
Pair identityPrefer canonical uppercase symbols (HBAR, USD) if you hash pair keys

Hedera chain IDs: testnet 296, mainnet 295.

See references/hedera-feeds.md for where to source Hedera feed addresses. See references/examples.md for read and normalize sketches.

Critical: Completeness Then Staleness

Never return a price from a missing or unfinished round. Revert when:

ConditionWhy
answeredInRound < roundIdAggregator has not finished this round
updatedAt == 0No successful update
answer <= 0Invalid / non-positive price
block.timestamp - updatedAt > maxStalenessStale for this consumer
(uint80 roundId, int256 answer,, uint256 updatedAt, uint80 answeredInRound) =
    feed.latestRoundData();

if (answeredInRound < roundId || updatedAt == 0) revert IncompleteRound();
if (answer <= 0) revert InvalidPrice();
if (block.timestamp - updatedAt > maxStaleness) revert StalePrice(updatedAt, maxStaleness);

Critical: Hedera Feeds, Not Ethereum Addresses

Do not copy Ethereum mainnet aggregator addresses onto Hedera. Look up Hedera-specific Data Feed addresses for chain 295 / 296 and re-check docs before mainnet.

Pair maps (if you use them) should be constructor-only unless the project explicitly supports post-deploy updates.

Decimal Normalization

feed.decimals() is often 8. Convert to the scale your app uses before arithmetic:

uint256 price = normalizeToScale(uint256(answer), feed.decimals(), /* target */ 18);

Keep conversion rounding explicit (usually round down). Do not mix raw aggregator units with 18-decimal amounts.

Checklist

When implementing or reviewing Chainlink reads on Hedera:

  • Feed address taken from Hedera Data Feeds docs (not Ethereum)
  • latestRoundData completeness checks before using answer
  • Non-positive prices revert
  • Staleness bound is enforced
  • Decimals normalized to the consumer scale
  • Chain ID is 295 or 296 (or the project’s documented Hedera network)

References

FAQ

What does the chainlink-data-feeds skill do?

Chainlink Data Feeds on Hedera. Use when reading AggregatorV3 price feeds on Hedera (testnet 296 / mainnet 295), calling latestRoundData, checking round completeness and staleness, or normalizing feed decimals. Not for Chainlink CCIP (cross-chain tokens).

How do I install chainlink-data-feeds?

Run npx skills add https://github.com/hedera-dev/hedera-skills --skill chainlink-data-feeds in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/chainlink-data-feeds/ (personal) or .claude/skills/chainlink-data-feeds/ (project).

Which AI agents can use chainlink-data-feeds?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is chainlink-data-feeds safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains chainlink-data-feeds?

It is published by hedera-dev in hedera-dev/hedera-skills. It has 458 recorded installs.

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