Current Value
0.00000003 TAO (30 raw)
Conversion: ÷ 10^9 (RAO → TAO)
Relevant for: developers
The Big Picture
Storage isn't free. Every byte of code or contract storage requires a deposit. This constant sets the rate: total_deposit = bytes * DepositPerByte. Larger contracts cost more to deploy.
From Chain Metadata
The amount of balance a caller has to pay for each byte of storage. # Note Changing this value for an existing chain might need a storage migration.
Use Cases
- Calculate storage costs for contracts
- Estimate deployment deposits
- Plan contract economics
Code Examples
import { createClient, Binary } from "polkadot-api";
import { getWsProvider } from "polkadot-api/ws";
import { sub } from "@polkadot-api/descriptors"; // generated by: npx papi add sub -w wss://entrypoint-finney.opentensor.ai:443
const client = createClient(getWsProvider("wss://entrypoint-finney.opentensor.ai:443"));
const api = client.getTypedApi(sub);
// Query DepositPerByte constant
const value = await api.constants.Contracts.DepositPerByte();
console.log("DepositPerByte:", value);
// Balance: divide by 10^9 for TAO
const tao = value / 1_000_000_000n;Type Information
- Type
- u64
- Byte Size
- 8 bytes
- Encoding
- fixed
- Raw Hex
- 0x1e00000000000000
Runtime Info
- Pallet
- Contracts
- First Version
- v334
- Latest Version
- v334
- Current Runtime
- v411