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Price feed examples using the Witnet decentralized oracle network

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witnet-price-feeds

This repository contains the price feeds currently mantained by the Witnet Foundation within all the EVM-compatible networks supported by the Witnet oracle.

Usage

Install repo

  • npm install
  • npm run flatten

List Witnet-supported networks

  • npm run avail:networks

List available price feeds

  • npm run avail:feeds

List deployed addresses

  • See contents of migrations/addresses.json

Create new Witnet price update query

  • Add new .js file into queries/ folder.
  • Follow examples available in same folder, or this tutorial.
  • Compile JS queries into CBOR-encoded bytecodes: npm run compile:queries A new entry will be added to migrations/witnet-queries.json file, named after the new .js

Try out Witnet price update queries

  • Run this command: npm run try-query:js <path_to_js_file>

Deploy new WitnetPriceFeed instance

  • Specify fields base, quote and decimals within the corresponding entry in migrations/witnet.request.json, if not yet done so.
  • Add empty string into the appropiate network section within migrations/addresses.json file, named after the Witnet price update request you want to deploy. E.g.:
    {
      ...    
      "boba": {
        ...
        "boba.mainnet": {
          ...
          "OmgBtcPriceFeed": """
        },  
      }
    }
    
  • `npm run migrate <network.name>´
  • Type "y" + [ENTER] when asked for permission to update the WitnetPriceRouter contract.

Update an already deployed WitnetPriceFeed instance:

  • Remove address from the corresponding entry within migrations/addresses.json
  • npm run migrate <network.name>
  • Type "y" + [ENTER] when asked for permission to update the WitnetPriceRouter contract.

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