Price Feeder

Overview

The price feeder is a tool that validators use to submit oracle prices to Exocore nodes.

This tool fetches token prices from off-chain sources such as CEX and DEX, then submits this price information to the Exocore blockchain network as a standard Cosmos SDK transaction. Once the submitted prices from validators reach the voting power threshold, they achieve consensus on-chain and become the final price.

Workflow

1. Subscribe to a new block.
2. Retrieve prices from off-chain sources.
3. Submit a transaction with the price data to update the oracle price on-chain.

Installation

make install

Or check out the latest release.

Quick Start

pricefeeder --config path/to/config --sources path/to/sources/config start -m [mnemonic of validator's consensus key]

eg.

config.yaml (path/to/config/config.yaml)

sources:
  - chainlink
tokens:
  - ETHUSDT
sender:
  mnemonic: "wonder myself quality resource ketchup occur stadium shove vicious situate plug second soccer monkey harbor output vanish then primary feed earth story real like"
  path: /Users/xx/.tmp-exocored/config
exocore:
  chainid: exocoretestnet_233-1
  appName: exocore
  rpc: 127.0.0.1:9090
  ws:
    addr: !!str ws://127.0.0.1:26657
    endpoint: /websocket

For mnemonic used by validator to sign transactions (which should be ed25519 private-key corresponding to validator's consensus key), the priority is:

1. cli: --mnemonic flag
2. config file: sender.mnemonic
3. config file: search priv_validator_key.json from sender.path

config for sources:

• oracle_env_chainlink.yaml (path/to/sources/config/oracle_env_chainlink.yaml)

  urls:
  mainnet: !!str https://eth-mainnet.g.alchemy.com/v2/Gnp7OQDBAH0hkdE7AKsSyZQ_bfF5oGQY
  sepolia: !!str https://eth-sepolia.g.alchemy.com/v2/Ru0VLnIJ9Raw_MHCIM_mn0Bl036n4Uhg
  tokens:
  ETHUSDT: 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419_mainnet
  AAVEUSDT: 0x547a514d5e3769680Ce22B2361c10Ea13619e8a9_mainnet
  AMPLUSDT: 0xe20CA8D7546932360e37E9D72c1a47334af57706_mainnet
  WSTETHUSDT: 0xaaabb530434B0EeAAc9A42E25dbC6A22D7bE218E_sepolia
  STETHUSDT: 0xCfE54B5cD566aB89272946F602D76Ea879CAb4a8_mainnet

• oracle_env_beaconchain.yaml (path/to/sources/config/oracle_env_beaconchain.yaml

  url:
  !!str https://rpc.ankr.com/premium-http/eth_beacon/a5c4917a9285617a6027e6d924c558bc7732870d279a54bc995d2626ce54ab86