API3 data feed reader example

An example project that reads an API3 data feed

Instructions

• Install dependencies

yarn

• Create a .env file similar to example.env

echo 'MNEMONIC="bike north stone..."' > .env

• Go to market.api3.org and find a data feed you like
• If the data feed is not already activated, purchase a subscription
• On the data feed page, click the Integrate button and copy the address of the proxy. Alternatively, you can get the proxy address with the following command

NETWORK=ethereum-sepolia-testnet DAPI_NAME=ETH/USD yarn print-api3readerproxyv1-address

• Deploy DataFeedReaderExample by using the command below with your NETWORK and PROXY values. See the supported networks section for valid NETWORK values.

NETWORK=ethereum-sepolia-testnet PROXY=0x5b0cf2b36a65a6BB085D501B971e4c102B9Cd473 yarn deploy

• Have DataFeedReaderExample read from the proxy by using the command below with your NETWORK value

NETWORK=ethereum-sepolia-testnet yarn read-data-feed

Supported networks

Chains listed on market.api3.org are all supported. You can run the following command to list them.

yarn print-supported-chains

Local development and testing

@api3/contracts provides a MockApi3ReaderProxy contract for local development. See the tests for its usage, and run the tests with the following command.

yarn test

More?

See the advanced instructions.