Current Value
0.000000075 TAO (75 raw)
Conversion: ÷ 10^9 (RAO → TAO)
Relevant for: developers
The Big Picture
Beyond bytes, each storage key costs a flat deposit. This discourages creating many small items. Total storage deposit = (items * DepositPerItem) + (bytes * DepositPerByte).
From Chain Metadata
The amount of balance a caller has to pay for each storage item. # Note Changing this value for an existing chain might need a storage migration.
Use Cases
- Estimate storage costs for contract state
- Optimize storage item count
Code Examples
import { ApiPromise, WsProvider } from "@polkadot/api";
import { stringCamelCase } from "@polkadot/util";
const provider = new WsProvider("wss://entrypoint-finney.opentensor.ai:443");
const api = await ApiPromise.create({ provider });
// Query DepositPerItem constant
const value = api.consts[stringCamelCase("Contracts")][stringCamelCase("DepositPerItem")];
console.log("DepositPerItem:", value.toHuman());
// Convert RAO to TAO if this is a balance value
const taoValue = value.toBigInt() / BigInt(1e9);
console.log("TAO:", taoValue.toString());Type Information
- Type
- u64
- Byte Size
- 8 bytes
- Encoding
- fixed
- Raw Hex
- 0x4b00000000000000
Runtime Info
- Pallet
- Contracts
- First Version
- v334
- Latest Version
- v334
- Current Runtime
- v393