hts-system-contract
Hedera Token Service (HTS) smart contract development. Use when creating, managing, or interacting with Hedera-native tokens via Solidity contracts. Triggers include HTS tokens, Hedera token creation, HTS precompile, token minting/burning on Hedera, KYC/freeze/pause token controls, custom fee schedules, NFT collections on Hedera, or any token operations using the 0x167 precompile.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/hedera-dev/hedera-skills --skill hts-system-contract- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads hts-system-contract automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Hedera Token Service (HTS) System Contract
HTS precompile at 0x167 enables Solidity contracts to create and manage Hedera-native tokens with built-in compliance controls (KYC, freeze, pause) and custom fees.
Quick Reference
Imports:
import {HederaTokenService} from "@hashgraph/smart-contracts/contracts/system-contracts/hedera-token-service/HederaTokenService.sol";
import {KeyHelper} from "@hashgraph/smart-contracts/contracts/system-contracts/hedera-token-service/KeyHelper.sol";
import {ExpiryHelper} from "@hashgraph/smart-contracts/contracts/system-contracts/hedera-token-service/ExpiryHelper.sol";
import {HederaResponseCodes} from "@hashgraph/smart-contracts/contracts/system-contracts/hedera-token-service/HederaResponseCodes.sol";
Safe variants (auto-revert on failure): SafeHTS.sol, SafeViewHTS.sol
Critical: HBAR Payment Required
Token creation requires explicit HBAR value payment (not just gas):
// ❌ WRONG - fails with INSUFFICIENT_TX_FEE
(int rc, address token) = createNonFungibleToken(token);
// ✅ CORRECT
(int rc, address token) = createNonFungibleToken{value: msg.value}(token);
Call from TypeScript:
await contract.createToken(name, symbol, {
gasLimit: 350_000,
value: ethers.parseEther("15"), // ~$1-2 USD of HBAR
});
Token Key System
Seven key types control token operations (bit positions for keyType field):
| Key | Bit | Value | Controls |
|---|---|---|---|
| ADMIN | 0 | 1 | Update token, keys, deletion |
| KYC | 1 | 2 | Grant/revoke KYC |
| FREEZE | 2 | 4 | Freeze/unfreeze accounts |
| WIPE | 3 | 8 | Wipe balances |
| SUPPLY | 4 | 16 | Mint/burn |
| FEE | 5 | 32 | Update fees |
| PAUSE | 6 | 64 | Pause all operations |
Use KeyHelper for key construction:
keys[0] = getSingleKey(KeyType.SUPPLY, KeyValueType.CONTRACT_ID, address(this));
See references/keys.md for key value types and JSON tuple format.
Association Model
Accounts must associate with tokens before receiving them:
int rc = associateToken(accountAddress, tokenAddress);
require(
rc == HederaResponseCodes.SUCCESS ||
rc == HederaResponseCodes.TOKEN_ALREADY_ASSOCIATED_TO_ACCOUNT,
"Association failed"
);
Common Patterns
Fungible Token Creation
function createToken() external payable {
IHederaTokenService.HederaToken memory token;
token.name = "My Token";
token.symbol = "MTK";
token.treasury = address(this);
token.expiry = createAutoRenewExpiry(address(this), 7776000); // 90 days
(int rc, address created) = createFungibleToken{value: msg.value}(
token, 1000000, 18 // initialSupply, decimals
);
require(rc == HederaResponseCodes.SUCCESS, "Create failed");
}
Mintable NFT Collection
function createNFT() external payable {
IHederaTokenService.HederaToken memory token;
token.name = "My NFT";
token.symbol = "MNFT";
token.treasury = address(this);
token.tokenSupplyType = true; // FINITE
token.maxSupply = 10000;
IHederaTokenService.TokenKey[] memory keys = new IHederaTokenService.TokenKey[](1);
keys[0] = getSingleKey(KeyType.SUPPLY, KeyValueType.CONTRACT_ID, address(this));
token.tokenKeys = keys;
token.expiry = createAutoRenewExpiry(address(this), 7776000);
(int rc, address created) = createNonFungibleToken{value: msg.value}(token);
require(rc == HederaResponseCodes.SUCCESS, "Create failed");
}
function mintNFT(bytes memory metadata) external {
bytes[] memory metas = new bytes[](1);
metas[0] = metadata;
(int rc, , int64[] memory serials) = mintToken(tokenAddress, 0, metas);
require(rc == HederaResponseCodes.SUCCESS, "Mint failed");
}
KYC-Enabled Token
Treasury must self-grant KYC after creation:
// After token creation with KYC key
int kycRc = grantTokenKyc(tokenAddress, address(this));
require(kycRc == HederaResponseCodes.SUCCESS, "Self-KYC failed");
Response Code Handling
Always check response codes. SUCCESS = 22.
require(responseCode == HederaResponseCodes.SUCCESS, "Operation failed");
Common codes: See references/response-codes.md
Additional References
- API Reference: references/api.md - All function signatures
- Custom Fees: references/fees.md - Fixed, fractional, royalty fees
- Compliance Controls: references/compliance.md - KYC, freeze, pause details
- Struct Definitions: references/structs.md - HederaToken, Expiry, etc.
- Troubleshooting: references/troubleshooting.md - Common errors and fixes
FAQ
What does the hts-system-contract skill do?
Hedera Token Service (HTS) smart contract development. Use when creating, managing, or interacting with Hedera-native tokens via Solidity contracts. Triggers include HTS tokens, Hedera token creation, HTS precompile, token minting/burning on Hedera, KYC/freeze/pause token controls, custom fee schedules, NFT collections on Hedera, or any token operations using the 0x167 precompile.
How do I install hts-system-contract?
Run npx skills add https://github.com/hedera-dev/hedera-skills --skill hts-system-contract in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/hts-system-contract/ (personal) or .claude/skills/hts-system-contract/ (project).
Which AI agents can use hts-system-contract?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is hts-system-contract safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains hts-system-contract?
It is published by hedera-dev in hedera-dev/hedera-skills. It has 477 recorded installs.
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