pyth-price-feeds
Pyth pull price feeds on Hedera. Use when integrating Pyth on Hedera (testnet 296 / mainnet 295), fetching Hermes update payloads, paying updatePriceFeeds, calling getPriceNoOlderThan, checking confidence, or normalizing signed price + expo to 18 decimals.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/hedera-dev/hedera-skills --skill pyth-price-feeds- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads pyth-price-feeds automatically when relevant.
- 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.
Pyth Price Feeds (Hedera)
Pull pattern: Pyth is not a fire-and-forget push feed. Fresh reads usually need a Hermes payload submitted on-chain (payable) before getPriceNoOlderThan.
Hermes → updatePriceFeeds{value: fee}(updateData) → getPriceNoOlderThan(priceId, maxAge)
Consumers may wrap Pyth behind a local interface; that is optional. Do not assume a project-specific adapter name.
Quick Reference
| Piece | Role |
|---|---|
| Pyth contract | Network IPyth address |
| Price ID | bytes32 feed id (not an aggregator address) |
| Update | Payable updatePriceFeeds with Hermes updateData |
| Fee | getUpdateFee(updateData) — msg.value must cover it |
| Read | getPriceNoOlderThan(priceId, maxAge) |
| Confidence | Reject when conf > uint64(price) |
| Scale | Signed price + expo → consumer decimals (often 18) |
Hedera chain IDs: testnet 296, mainnet 295.
See references/hedera-feeds.md for where to source the Pyth contract and price IDs. See references/examples.md for update / read / expo sketches.
Critical: Update Before Fresh Reads
If the on-chain price is older than your staleness bound, fetch Hermes update data and submit it:
function updatePrice(bytes[] calldata updateData) external payable {
uint256 fee = PYTH.getUpdateFee(updateData);
if (msg.value < fee) revert UpdateFeeTooLow(msg.value, fee);
PYTH.updatePriceFeeds{ value: msg.value }(updateData);
}
Hedera msg.value is tinybars via JSON-RPC — attach enough native value for the Pyth fee. Do not treat a stale getPriceUnsafe as a valid trading price.
Critical: Confidence And Signed Expo
After getPriceNoOlderThan:
| Check | Why |
|---|---|
publishTime != 0 | Incomplete |
price > 0 | Invalid / non-positive |
conf > uint64(price) | Confidence wider than the price |
Normalize expo | expo is signed; not the same as ERC-20 decimals |
PythStructs.Price memory price = PYTH.getPriceNoOlderThan(priceId, maxStaleness);
if (price.publishTime == 0) revert IncompleteRound();
if (price.price <= 0) revert InvalidPrice();
if (price.conf > uint64(price.price)) revert InvalidConfidence();
Checklist
When implementing or reviewing Pyth on Hedera:
- Pyth contract + price IDs taken from Pyth Hedera / Hermes docs (not Ethereum defaults)
- Hermes payloads submitted with sufficient
msg.valuebefore relying on a fresh price - Reads use
getPriceNoOlderThan(or equivalent max-age API), not unbounded unsafe prices for trading - Confidence wider than price reverts
- Signed
exponormalized to the consumer scale - Chain ID is
295or296(or the project’s documented Hedera network)
References
- references/examples.md — update, read, and expo sketches
- references/hedera-feeds.md — where to source Pyth contract and price IDs
- Pyth Price Feeds
- Pyth EVM contract addresses
- Hermes price feeds
FAQ
What does the pyth-price-feeds skill do?
Pyth pull price feeds on Hedera. Use when integrating Pyth on Hedera (testnet 296 / mainnet 295), fetching Hermes update payloads, paying updatePriceFeeds, calling getPriceNoOlderThan, checking confidence, or normalizing signed price + expo to 18 decimals.
How do I install pyth-price-feeds?
Run npx skills add https://github.com/hedera-dev/hedera-skills --skill pyth-price-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/pyth-price-feeds/ (personal) or .claude/skills/pyth-price-feeds/ (project).
Which AI agents can use pyth-price-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 pyth-price-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 pyth-price-feeds?
It is published by hedera-dev in hedera-dev/hedera-skills. It has 458 recorded installs.
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