Oracles

Oracles act as a bridge between the Filecoin network and external data sources. Secure oracles allow smart contracts on the FVM to access and use external data sources.

In the Filecoin network, on-chain data and the state of smart contracts are isolated from external data sources. They cannot access real-world information without breaking the deterministic attributes of the network. Since smart contracts cannot access information outside the Filecoin network, oracles are used as trusted entities to provide external data to the network.

Oracles are an essential component of many blockchain applications, as they enable the blockchain to interact with the real world and provide more functionality to blockchain-based systems. Oracles can retrieve data from external sources, verify the data, and submit it to the blockchain for use by smart contracts and decentralized applications (dapps).

Oracles enable builders to integrate the following features into their projects:

• Price feeds: DeFi protocols like cross-chain lending rely on oracles for various token or token pair prices.

• Cross-chain storage deal verification: enable applications running on any blockchains to use the Filecoin decentralized storage and allow them to verify deal status and proofs.

• Perpetual storage: enable automated deal renewal and repair with the oracle providing deal status off-chain.

Available oracles

There are several oracle-protocols built upon the FVM. Builders can integrate these oracles into their applications today.

Tellor

Tellor is an optimistic oracle. Builders should not accept instant price quotes and should wait a few minutes before locking in details.

Tellor supports a price feed oracle and a data oracle for the Filecoin network. The data oracle can provide Filecoin-specific data, such as the reputation of storage providers, which helps lending protocols determine interest rates for SPs.

Tellor smart contracts

Teller’s smart contracts are live on the Filecoin Mainnet and Calibration testnet.

Name	Address	Mainnet	Calibration
Bridged TRB	0x045CE60839d108B43dF9e703d4b25402a6a28a0d	✔️
Playground/TRB	0x15e6Cc0D69A162151Cadfba035aa10b82b12b970		✔️
Oracle	0xb2CB696fE5244fB9004877e58dcB680cB86Ba444	✔️	✔️
Governance	0xb55bB55f7D8b4F26Bd18198088C96488D95cab39	✔️	✔️
Autopay	0x60cBf3991F05a0671250e673Aa166e9D1A0C662E	✔️	✔️
TellorFlex	0xb2CB696fE5244fB9004877e58dcB680cB86Ba444	✔️	✔️
QueryDataStorage	0xf44166ca8bdB612268a4D401e4c5147968E5a190	✔️	✔️
Multisig	0x34Fae97547E990ef0E05e05286c51E4645bf1A85	✔️	✔️

Further Tellor resources

• Tellor docs

• Filecoin Storage Insurance Contract

• Getting Tellor Data for any use case - FVM Dataverse Hackathon