This folder offers several tools that simplify the interaction with the Blockchain Presence oracle.
BCP_informed.sol should be imported into the Solidity code of your smart contract application. It is an abstract contract which means it is not a standalone contract but assists you in connecting to the oracle. By importing it into your contract, it allows you to call the following three functions:
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The GetTransactionCosts function calculates the value you need to send with the Order function. This value corresponds to the sum of the sender fee and the gas for the delivery transaction.
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The Order function is used to place an order as described in the corresponding commitment.
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The CancelOrder function allows you to cancel an unfilled order (for any reason). As a result, the sender fee will be reimbursed to the address from which the Order function was called .
The minimal use case is an example of a smart contract that interacts with the Blockchain Presence oracle. To learn how to order and receive data, this example might serve as a first point of reference.
- Polygon Mainnet: 0x067504587E1E598F861282C9fFd619E5B0a0d238
- Mumbai testnet: 0xD200F64cEcc8bBc1292c0187F5ee6cD7bDf1eeac
- 1 Random Number Generator
- 2 White Ether
- 3 SBB departures delay
- 4 SBB arrivals delay
- 5 Current weather
- 6 Bitcoin and Ether prices
- 7 Exchange rates
- 8 U.S. stocks historical prices
- 9 SIX stocks prices
- 10 U.S. company financial information
- 11 Repo reference rates: SWISS AVERAGE RATES (SAR)
- 12 Spot interest rates with different maturities for CHF Swiss Confederation bond issues
- 13 Metals market prices
- 14 Cryptocurrencies price
- 15 Cryptocurrencies metric
- 16 Recommended gas prices
- 17 ETH transaction waiting time
- 18 Account balance
- 19 Average transaction cost
- 20 Blockchain height
- 21 Number of unconfirmed transactions