[pricefeeder] Add ynETHx oracle feed on mainnet

[Unique-Divine]

The Ask

• 1. Add ynETHx:ETH query using ChainLink as the data source
• 2. Add Pyth API as a data source
• 3. Add ynETHx:ETH query using Pyth API as a source
• 4. Aggregate price provider ynETH:USD, built from ynETHx:ETH times ETH:USD.

Reference Info

ChainLink info

• https://data.chain.link/feeds/base/base/yneth-eth-exchange-rate
• Chainlink contract on basescan
• YNETHXWETH Pyth feed info.

Q: Are there pyth feeds accessible via API call, or do you have to access data
from oracle contracts deployed on Pyth-supported blockchains?

A: Pyth publishes an API reference: at "Price Feeds | Pyth Network API Reference" you'll find endpoints for fetching the latest price object for a given feed ID.

• pyth hermes REST API docs
• Pyth API Rate Limits