Example Chainlinks that get data from various sources. Already deployed to Ropsten, you can run the included scripts to easily fetch data on-chain via Chainlink.
- AlphaVantage (Bridges URL): Forex rates
- API Aggregator: Aggregate values from multiple APIs for ETH & BTC.
- Asset Price: Specify any crypto pair and get a price aggregated by weighted volume from all supported exchanges that list a pair. Eg: BTC-USD, LINK-BTC, ETH-USDT, ADA-BTC.
- Wolfram Alpha: Find the distance between two locations in miles using the Short Answers API and natural language.
- Rapid API (Weather) (Bridges URL): Get the temperature, humidity and windspeeds at any global location.
Install dependencies with yarn/npm.
To first use this on Ropsten, you can update truffle.js with your private key and RPC host for deployment.
This could be Infura or your own node for example.
This repository includes the ropsten contract build files, so once you set up truffle.js you can use the scripts
on the Ropsten network.
You can also deploy this locally using ganache-cli, but you need to deploy the Oracle.sol contract for
your Chainlink node and create a new job spec as per the example you want to use in specs.
In truffle.js enter your mnemonic and Ethereum URL, eg Infura.
To deploy, run a standard Truffle migration (uses Truffle from local deps):
npm run migrate
Request the current rate of the pound to the dollar:
npm run exec scripts/alphavantage/request.js -- GBP USD --network ropsten
npm run exec scripts/alphavantage/get.js -- GBP USD --network ropsten
Request the current price of BTC aggregated from Coinbase & Bitstamp:
npm run exec scripts/apiaggregator/request.js -- --network ropsten
npm run exec scripts/apiaggregator/get.js -- --network ropsten
Request the price of BTC-USD aggregated from many exchanges:
npm run exec scripts/assetprice/request.js BTC USD -- --network ropsten
npm run exec scripts/assetprice/get.js BTC USD -- --network ropsten
LINK-BTC:
npm run exec scripts/assetprice/request.js LINK BTC -- --network ropsten
npm run exec scripts/assetprice/get.js LINK BTC -- --network ropsten
Request the distance between London and Tokyo:
npm run exec scripts/wolframalpha/request.js London Tokyo -- --network ropsten
npm run exec scripts/wolframalpha/get.js London Tokyo -- --network ropsten
Request the temperature in Celsius:
npm run exec scripts/rapidapiweather/request.js metricTemp London,uk -- --network ropsten
npm run exec scripts/rapidapiweather/get.js metricTemp London,uk -- --network ropsten
Request the humidity percentage:
npm run exec scripts/rapidapiweather/request.js humidity London,uk -- --network ropsten
npm run exec scripts/rapidapiweather/get.js humidity London,uk -- --network ropsten
Request the windspeed in mph:
npm run exec scripts/rapidapiweather/request.js windSpeed London,uk -- --network ropsten
npm run exec scripts/rapidapiweather/get.js windSpeed London,uk -- --network ropsten
The truffle.js ropsten network is configured to point to a LinkPool node.
You don't need to change the configuration as our node will accept requests from your contract with no changes.
Although, you can edit the jobId and oracleAddress as specified in the Truffle configuration to point to
your own node.