pyth-crosschain/target_chains/cosmwasm/examples/cw-contract/README.md

Pyth SDK Example Contract for CosmWasm

This repository contains an example contract that demonstrates how to query Pyth on-chain contract. The example contract has two functions:

• instantiate sets the Pyth contract address and price feed id that the contract uses. This function is intended to be called once when the contract is deployed. See the price-feed-ids for the list of possible price feed ids.
• query queries the Pyth contract
  • to get the current price for the configured price feed id.
  • to fetch the default valid time period.
  • to calculate the fee for updating a price feed.

Testnet Demo

This example contract is running on Injective testnet at inj1cc9effer9ttdfrkfghfj7y3ph48c36a9y8d7cv. This contract has been instantiated to return the price of Crypto.INJ/USD. You can query the contract using the schema at schema/example-cw-contract.json.

Some example queries:

{
  "fetch_price": {}
}

If the query is successful, the output should look like:

{
  current_price: { price: "8704350000", conf: "3150000", expo: -8, publish_time: "1674224555332"  },
  ema_price: { price: "8665158600", conf: "2965370", expo: -8, publish_time: "1674224555332" }
}

If the price feed is currently not available you will see:

rpc error: code = Unknown desc = Generic error: Current price is not available: contract query failed

Developing

If you would like to deploy a changed version of this contract, the process consists of two steps:

1. Build the WASM for the contract.
2. Upload the code and instantiate a new contract.

Build WASM

See the Developing instructions for how to build the WASM for the contract. The instructions in that document will build a file called example_cw_contract.wasm under the artifacts/ directory.