create
Call Re-added v210 → v323, v326 → current #2Deploys a new smart contract using CREATE opcode logic.
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with create, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch which emits events: Log, Created, CreatedFailed and modifies storage: AccountCodes, AccountCodesMetadata, AccountStorages, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: developers
The Big Picture
Contract deployment creates permanent on-chain code at a deterministic address.
Use Cases
- Deploy ERC-20 tokens
- Deploy DeFi protocols
- Deploy NFT contracts
From Chain Metadata
Issue an EVM create operation. This is similar to a contract creation transaction in Ethereum.
Input Parameters
| # | Name | Type | Description |
|---|---|---|---|
| 0 | source | H160 | source (H160) |
| 1 | init | Vec<u8> Vec | init (Vec<u8>) |
| 2 | value | U256 | value (U256) |
| 3 | gas_limit | u64 | gas_limit (u64) |
| 4 | max_fee_per_gas | U256 | max_fee_per_gas (U256) |
| 5 | max_priority_fee_per_gas | Option | max_priority_fee_per_gas (Option) |
| 6 | nonce | Option | nonce (Option) |
| 7 | access_list | Vec<(H160, Vec<H256>)> Vec | access_list (Vec<(H160, Vec<H256>)>) |
| 8 | authorization_list | Vec<AuthorizationListItem> Vec | authorization_list (Vec<AuthorizationListItem>) |
Permissions
Origin
Unknown
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Valid init code
- Sufficient gas
- Whitelisted if required
Effects
Events Emitted
Storage Modified
Postconditions
- Contract at deterministic address
- AccountCodes updated
Side Effects
- Address derived from sender + nonce
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 });
// Build create call
const source = 0 as any /* H160 */;
const init = 0;
const value = 0 as any /* U256 */;
const gas_limit = 0;
const max_fee_per_gas = 0 as any /* U256 */;
const max_priority_fee_per_gas = 0 as any /* Option */;
const nonce = 0 as any /* Option */;
const access_list = 0 as any /* Vec<(H160, Vec<H256>)> */;
const authorization_list = 0 as any /* Vec<AuthorizationListItem> */;
const call = api.tx[stringCamelCase("EVM")][stringCamelCase("create")](
source,
init,
value,
gas_limit,
max_fee_per_gas,
max_priority_fee_per_gas,
nonce,
access_list,
authorization_list
);Version History
v210 block 4,345,556 8 args
v326 block 6,608,228 9 args Current
Runtime Info
- Pallet Index
- 22
- Call Index
- 2
- First Version
- v210
- Current Version
- v393