Koios

• New Cardano transactionRuns for each new transaction of a Cardano address, or of any address of a wallet given by its stake address, with the ADA received and sent and its message. Checks every five minutes or so; transactions made before the workflow is turned on never run it.

• Get latest blockGet Cardano's newest block: its number, hash, epoch and slot, when it was made and how many seconds ago.
• Get epochGet one of Cardano's five-day epochs, or the current one: when it starts and ends, its blocks, transactions and fees, the ADA staked, and the rewards paid for it.
• Get ADA supplyGet how much ADA has been issued, how much is in circulation, in the treasury and in the reserves, and the unclaimed rewards, as of the start of an epoch (the current one by default).
• Get addressGet a Cardano address's ADA balance, the stake address of the wallet it belongs to, whether a smart contract controls it, and how many outputs and kinds of token it holds. An address never used comes back with a zero balance rather than failing.
• List address transactionsList the transactions of a Cardano address, or of a whole wallet by its stake address, newest first, with the block and time of each. Narrow them to those since a time or from a block.
• List address tokensList the native tokens and NFTs a Cardano address holds, or a whole wallet by its stake address, with each token's name, fingerprint and amount (decimals applied).
• Get stake accountGet a Cardano wallet's stake account: everything it holds, the rewards it can withdraw, the stake pool it delegates to and the DRep it delegates its vote to. Give its stake address or any of its addresses.
• List staking rewardsList the staking rewards a Cardano wallet has earned, newest epoch first: how much, of what kind, from which pool, and when it could be spent.
• List wallet addressesList the addresses of a Cardano wallet: every address that shares its stake address and holds something, or every one it has used.
• Get transactionGet a Cardano transaction: when and in which block it was made, its fee, what it spent and where the ADA and tokens went, tokens minted or burned, rewards withdrawn, its certificates, and its message and metadata.
• Get transaction confirmationsFind out whether a Cardano transaction is on chain and how many blocks have confirmed it. One not found comes back with found false rather than failing, so a workflow can wait and check again.
• List blocksList Cardano's blocks, newest first, optionally only those of one epoch or made by one stake pool, with each block's time, transactions and size.
• Get blockGet a Cardano block by its hash or number: when it was made, by which pool, its fees and output, its confirmations, the blocks either side, and the hashes of its transactions.
• Get tokenGet a Cardano native token or NFT: its name, ticker, description and decimals from the token registry, how much exists, how often it was minted and burned, when it was created, and the metadata it was minted with.
• List token holdersList the addresses holding a Cardano token or NFT, with how much each holds and its stake address, in Koios's order (not by size). For a token held by a great many wallets the list can be too big for Koios's free service to make in time.
• List policy tokensList every token minted under a Cardano policy ID, such as the NFTs of a collection, with each one's name, fingerprint and supply.
• List stake poolsFind Cardano stake pools by ticker, with each pool's ID, status, stake, pledge, margin and fixed cost.
• Get stake poolGet a Cardano stake pool: its name and homepage, status, margin, fixed cost and pledge, its stake and delegators now, how saturated it is, the blocks it has made, its relays and its voting power.
• List stake pool historyList a Cardano stake pool's record epoch by epoch, newest first: its stake and saturation, blocks made, delegators, fees taken, rewards paid and its delegators' return.
• List governance proposalsList Cardano's on-chain governance proposals, newest first, with each one's title and summary, kind, status, voting deadline, deposit and, for a treasury withdrawal, the ADA it asks for.

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