Koios Provider
Distributed & open-source public API query layer for Cardano
Koios provides a query layer which allows your app to access information stored on the blockchain.
Get started:
Get data from URL
You can fetch any data from the blockchain by providing the URL path.
Fetch data from the blockchain
Fetch Account Info
Obtain information about a specific stake account.
Fetch account info using stake address
Fetch Address Assets
Fetch assets from an address.
Fetch UTxOs from address
Fetch assets given an address
Fetch Address UTxOs
Fetch UTxOs controlled by an address.
Optionally, you can filter UTXOs containing a particular asset by providing asset, where it is the concatenation of policy ID and asset.
Fetch UTxOs from address
Fetch UTxOs from address with asset
Fetch Asset Addresses
Fetch a list of a addresses containing a specific asset where it is the concatenation of policy ID and asset.
Fetch list of addresses containing a specific asset
Fetch Asset Metadata
Fetch the asset metadata by providing asset's unit, which is the concatenation of policy ID and asset name in hex.
Fetch metadata from asset ID
Fetch Block Info
Fetch block infomation. You can get the hash from fetchTxInfo().
Fetch information about a block
Fetch Collection Assets
Fetch a list of assets belonging to a collection by providing its Policy ID.
The API will return a list of assets and a cursor next. If the cursor is not null, you can use it to fetch the next page of results. Here is an example of the response.
The fetchCollectionAssets function also accepts an optional cursor parameter to fetch the next page of results. The default value is 1.
Fetch list of assets belonging to a collection and its quantity
Fetch Handle Address
ADA Handle allows users to use a human-readable "Handle" to associate an address.
Each Handle is a unique NFT, minted and issued on the Cardano blockchain. These NFTs act as unique identifiers for the UTXO that they reside in.
We can resolve the handle's address with fetchHandleAddress.
Fetch address by handle
Fetch Handle
ADA Handle allows users to use a human-readable "Handle" to associate an address.
Each Handle is a unique NFT, minted and issued on the Cardano blockchain. These NFTs act as unique identifiers for the UTXO that they reside in.
ADA Handle also released a CIP68 handle and this function will fetch the metadata of the handle.
Fetch handle metadata
Fetch Protocol Parameters
Fetch the latest protocol parameters.
Optionally, you can provide an epoch number to fetch the protocol parameters of that epoch.
Fetch protocol parameters of the blockchain by epoch
Fetch Transaction Info
Fetch transaction infomation. Only confirmed transaction can be retrieved.
Fetch information about a transaction
Fetch UTxOs
Get UTxOs for a given hash.
Optionally, you can specify the index of the index output.
Fetch UTxOs given hash
Fetch Proposal Info
Get information for a given governance proposal, identified by the txHash and proposal index
Fetch Proposals for a given TxHash and certIndex
Submit Transaction
Submit a serialized transaction to the network.
On Transaction Confirmed
Allow you to listen to a transaction confirmation. Upon confirmation, the callback will be called.