FPO Providers

A Quick Brief
In the current version of our EVM FPO, a new contract must be deployed for each price pair / data packet you plan on pushing data to. First, follow the directions below to set up the contract on your  chosen EVM chain, then set up and deploy the Provider Node to start pushing data to the contract.
In Near, we have already deployed the FPO smart contract so you don't need to.
1. The following documentation is intended to provide transparency on how our providers set up their own First Party Oracle contracts on Aurora, and Provider Node to push data to it as well as to our NEAR First Party Oracle. Please test in a safe environment before using in production, and make sure the repos are up to date with the main branch to avoid issues! 
2. If you are here as a data requesting protocol that would like to spin up a provider node just to bootstrap your protocol, fill in the form on the FPO Requester page and we'll see about getting your price feeds / other data needs set up!
3. If you are a data provider who would like to partner up with Flux and provide your data to our FPOs, fill out the form below!
FPO Contract Setup & Deployment
For deploying on an EVM chain like Aurora, follow the directions in the EVM Chain tab to set up the smart contract you will be pushing data to. For deploying on NEAR, follow the directions in the NEAR tab to configure your development environment for NEAR, and set yourself up with a testnet account. 
Our NEAR FPO is already deployed on the testnet at fpo3.franklinwaller2.testnet. You only need to set up your near account and provider node to be able to start pushing data to it. 
NEAR
EVM Chain (Aurora)
Follow the directions here to set up the rust toolchain, your NEAR account, & the near-cli package. (npm i -g near-cli).
Flux provides a smart contract for price feeds and a node to constantly post data to a deployed version. The price feed contract is compatible with Chainlink's AggregatorInterface and AggregatorV3Interface for easy integration into existing smart contract infrastructure. There are no limits in how often an answer can be posted to the contract. The contract uses OpenZeppelin's Access Control library to manage roles; by default only the deployer has permission to post data or to grant others permission.
Currently, deploying and posting to Aurora is supported, but the tools are easily modified to deploy to any EVM chain, and more will be included by default in the future.
Deploying price feed contract
Data providers first must deploy FluxPriceFeed.sol by cloning this repository. For example, the commands to deploy a contract with description ETH / USD are:
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git clone https://github.com/fluxprotocol/fpo-evm
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cd price-feeds-evm
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cp .env.example .env # populate with mnemonic
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yarn install
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yarn compile
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yarn deploy --decimals 8 --description "ETH / USD" --network aurora
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The last command will output a contract address; save this.
To confirm you set up the contract correctly, try posting to it by running:
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$ yarn transmit --contract "0xContractAddress" --answer 4200000000 --network aurora
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yarn latestAnswer --contract "0xContractAddress" --network aurora
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If everything worked, you should see the last command return 12345.
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Provider Node Setup & Deployment
Pre-requisites
You must have node.js installed. We are using v14.18.1.
General Set-up
Follow the commands below to clone the fpo-node repository.​
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git clone https://github.com/fluxprotocol/oracle-provider-node
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cd oracle-provider-node/
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npm install
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cp .env.example .env # add private key
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nano appconfig.json # populate with contract address, API sources, network, and interval
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To improve the project and receive better support please consider setting the DISABLE_ANALYTICS to false. No private keys will be submitted.
In appconfig.json, each price pair is mapped to a single contract and can have any number of sources. The node will push the result of the last source that returns an answer, throwing out sources that do not respond.
Configuring appconfig.json
Key
Type
Description
networks
Network[]
An array of network configuration. (Explained below)
pairs
Pair[]
An array of pricing pairs with there sources (Explained below)
Network
Configuration for a specific network. Currently two types are supported. evm and near. You can use each network type multiple types to combine for example Avalanche, Polygon and Ethereum.
NEAR
EVM Chain (Aurora)
Setup
First login using the near-cli by doing NEAR_ENV=testnet near login (NEAR_ENV=mainnet for mainnet). This will store private keys inside the ~/.near-credentials/testnet (or /mainnet for mainnet). If for some reason the data is not in those folders please manually copy the private key over from ~/.near-credentials/default over to the desired network folder.
In the appconfig.json Make sure if you are using NEAR to change the accountId (containing {{YOUR_ACCOUNT_ID}}) with your accountId that you just used to login with. Also if you want to deploy for mainnet, make sure the networkType is set to mainnet and rpc is set to https://rpc.testnet.near.org.
In the .env file you just created, change the NEAR_CREDENTIALS_STORE_PATH to the root of the near-credentials folder. (For example /home/myname/.near-credentials/).
Near does not require a new contract deployment for each pair. Each pair is generated automaticly when you push a new pair. See Contract addresses for NEAR Near is also the only one to support batching of transactions, making it cheaper for you to push data on chain. Please see Batching​
Configuration
accessing / generating NEAR private keys
There's multiple ways to go about this. The simplest method would be to create, or sign in to, a NEAR account using the near web wallet. And then calling NEAR_ENV={NETWORK} near login and following the steps provided by the CLI. This will generate a access keys in ~/.near-credentials/{NETWORK}/{MY_ACCOUNT}.near.json which can then be copied into any environment. We would also recommend for you to check out batching of transactions, this makes pushing data on chain be done 1 transaction instead of multiple saving you gas. See Batching for more information.
contract addresses
Network
Contract address
testnet
fpo3.franklinwaller2.testnet
mainnet
fpo-v1.fluxoracle.near
configuration
Key
Type
Description
type
"near"
Lets the node know this is an EVM type chain
networkId
string
A custom ID that you fill in. This will be used to connect pairs to a specific network configuration. Can be anything you want to identify the configuration
credentialsStorePathEnvKey
string
The name of the env variable where the credentials are stored. Not required if you are using privateKeyEnvKey
privateKeyEnvKey
string
The name of the env variable where the private key is stored (can be set in the .env file). Not required if you are using credentialsStorePathEnvKey
networkType
string
Whether this network is "testnet" or "mainnet"
rpc
string
The URL to the Ethereum compatible RPC
accountId
string
The accountId coupled with the privateKey/credentials
Example:
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{
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    "networks": [
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        {
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            "type": "near",
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            "networkId": "near-testnet",
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            "credentialsStorePathEnvKey": "NEAR_CREDENTIALS_STORE_PATH",
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            "networkType": "testnet",
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            "rpc": "https://rpc.testnet.near.org",
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            "maxGas": "300000000000000",
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            "accountId": "YOUR_ACCOUNT_ID.testnet",
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            "storageDeposit": "300800000000000000000000"
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        }
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    ]
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}
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Change the chainId and rpc to the desired EVM chain in the appconfig.json file. Currently it is configured to use the Aurora EVM chain.
Change in the .env the AURORA_PRIVATE_KEY to your private key (Not a mnemonic but the key that starts with 0x)
Configuration
Key
Type
Description
type
"evm"
Lets the node know this is an EVM type chain
networkId
string
A custom ID that you fill in. This will be used to connect pairs to a specific network configuration. Can be anything you want to identify the configuration
privateKeyEnvKey
string
The name of the env variable where the private key is stored. (can be set in the .env file)
chainId
number
The chain id of the EVM chain. (1 = Ethereum)
rpc
string
The URL to the Ethereum compatible RPC
Example:
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{
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    "networks": [
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        {
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            "type": "evm",
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            "networkId": "aurora",
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            "privateKeyEnvKey": "AURORA_PRIVATE_KEY",
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            "chainId": 1313161554,
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            "rpc": "https://mainnet.aurora.dev"
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        }
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    ]
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}
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Pairs
Pairs include information for a specific pair such as which sources to fetch from, how often and where to post them.
Key
Type
Description
description
string
undefined
pair
string
Info about the pair. Should be something like "ETH / USD". This info will also be posted on chain depending on the network.
contractAddress
string
Which FPO address to post the answers to.
sources
Source[]
An array of sources. More on that below.
interval
number
Interval between updates.
networkId
string
The id of the network in your "networks" configuration.
defaultDecimals
number
If there are no decimals configured, the node will use and submit a number containing this many decimals. Defaults to 6
Batching
Batching allows you to push multiple price pushes in one transaction. This is only supported by the NEAR network. We recommend to only put around 20 price pairs in one batch. This has to do with the gaslimit of NEAR. More could be fit in but this should be tested on your own.
Key
Type
Description
description
string
Allows you to identify which batch is currently processing. Required
interval
number
The interval the batch should be triggered at
networkId
string
The id of the network in your "networks" configuration.
pairs
Pair[]
An array of Pair. See above what kind of settings are required for those. Notice that settings like interval are ignored, since they are part of the batch.
Example:
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{
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    "batches": [
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        {
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            "description": "Price data for NEAR",
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            "contractAddress": "fpo3.franklinwaller2.testnet",
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            "interval": 60000,
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            "networkId": "near-testnet",
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            "pairs": [
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                {
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                    "description": "ETH / USD for NEAR",
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                    "pair": "ETH / USD",
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                    "sources": [
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                        {
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                            "source_path": "market_data.current_price.usd",
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                            "end_point": "https://api.coingecko.com/api/v3/coins/ethereum"
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                        }
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                    ],
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                    "defaultDecimals": 6
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                },
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                {
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                    "description": "NEAR / USD for NEAR",
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                    "pair": "NEAR / USD",
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                    "sources": [
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                        {
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                            "source_path": "market_data.current_price.usd",
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                            "end_point": "https://api.coingecko.com/api/v3/coins/near"
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                        }
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                    ],
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                    "defaultDecimals": 6
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                }
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            ]
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        }
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    ]
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}
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Sources
Information containing where to fetch data. Uses the jsonpath-rust package for finding values using keys.
Key
Type
Description
source_path
string
Path to the number value. Uses jsonpath-rust for finding values.
end_point
string
The URL to a JSON API
multiplier
string / undefined
The result value will be multiplied against this value. Can be useful to normalize decimals. Defaults to not being used.
http_method
string
HTTP Method (GET, POST, etc)
http_body
string
Body to sent along http request
http_headers
{ [key: string]: string }
Key -> Value pair of headers to attach to the request
Example:
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{
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    "pairs": [
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        {
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            "description": "ETH / USD for NEAR",
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            "pair": "ETH / USD",
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            "contractAddress": "fpo3.franklinwaller2.testnet",
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            "sources": [
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                {
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                    "source_path": "market_data.current_price.usd",
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                    "end_point": "https://api.coingecko.com/api/v3/coins/ethereum"
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                }
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            ],
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            "interval": 5000,
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            "networkId": "near-testnet",
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            "defaultDecimals": 6
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        }
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    ]
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}
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Run it
Once you have your configuration set up and are ready to go, run the following command!
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npm run start
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Interested In Partnering up?
If you are a data provider in DeFi or CeFi, have high quality, reliable feeds of aggregated or raw data, & would like to explore a partnership opportunity with Flux, fill out the form below and we'll be in touch!
S
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