pyth-price-feeds

Original：🇺🇸 English

Translated

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.

24installs

Sourcehedera-dev/hedera-skills

Added on2026-09-30

NPX Install

npx skill4agent add hedera-dev/hedera-skills pyth-price-feeds

SKILL.md Content

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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

.

text

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

, mainnet

.

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:

solidity

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