Gas Cost Reference
All registered embedded-runtime syscalls sorted by gas cost, grouped into cost tiers.
Tier 1 — 1 GAS unit
Metadata reads, logging, and iterator traversal. Cheap and safe to call frequently.
| Syscall Name | Category |
|---|---|
System.Storage.GetContext | Storage |
System.Storage.GetReadOnlyContext | Storage |
System.Storage.AsReadOnly | Storage |
System.Runtime.GetTrigger | Runtime |
System.Runtime.Platform | Runtime |
System.Runtime.GetNetwork | Runtime |
System.Runtime.GetAddressVersion | Runtime |
System.Runtime.GetTime | Runtime |
System.Runtime.GetScriptContainer | Runtime |
System.Runtime.GetExecutingScriptHash | Runtime |
System.Runtime.GetCallingScriptHash | Runtime |
System.Runtime.GetEntryScriptHash | Runtime |
System.Runtime.LoadScript | Runtime |
System.Runtime.GetInvocationCounter | Runtime |
System.Runtime.Log | Runtime |
System.Runtime.Notify | Runtime |
System.Runtime.GetNotifications | Runtime |
System.Runtime.GasLeft | Runtime |
System.Runtime.BurnGas | Runtime |
System.Runtime.CurrentSigners | Runtime |
System.Runtime.GetMsgValue | Runtime |
System.Iterator.Next | Iterator |
System.Iterator.Value | Iterator |
Tier 2 — 10 GAS units
Contract interaction syscalls.
| Syscall Name | Category |
|---|---|
System.Contract.Call | Contract |
System.Contract.GetCallFlags | Contract |
System.Contract.CreateStandardAccount | Contract |
System.Contract.CreateMultisigAccount | Contract |
Tier 3 — 50 GAS units
| Syscall Name | Category |
|---|---|
System.Runtime.GetRandom | Runtime |
Tier 4 — 100 GAS units
Storage read, delete, and search operations.
| Syscall Name | Category |
|---|---|
System.Storage.Get | Storage |
System.Storage.Delete | Storage |
System.Storage.Find | Storage |
System.Storage.Local.Get | Storage |
System.Storage.Local.Delete | Storage |
System.Storage.Local.Find | Storage |
Tier 5 — 200 GAS units
| Syscall Name | Category |
|---|---|
System.Runtime.CheckWitness | Runtime |
Tier 6 — 1,000 GAS units
Storage writes and cryptographic verification. The most expensive operations.
| Syscall Name | Category |
|---|---|
System.Storage.Put | Storage |
System.Storage.Local.Put | Storage |
System.Crypto.CheckSig | Crypto |
System.Crypto.CheckMultisig | Crypto |
Gas Accuracy
The neo-devpack-solidity embedded runtime tracks syscall gas costs with static approximation tables. The primary gaps are in storage pricing (which depends on the dynamic Policy.getStoragePrice() value on mainnet) and opcode-level metering. Always perform final gas estimation against a Neo N3 testnet node before mainnet deployment.
LoadScript
System.Runtime.LoadScript is present in the syscall registry for Neo N3 surface parity, but the embedded runtime rejects it at execution time. Use System.Contract.Call for inter-contract calls.