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ETH Balance
0 ETH
ETH Value
$0.00 (@ $1,906/ETH)
Token Holdings
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Additional Info
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Contract Name
MarketHoursToken (Stock Coin)
Compiler
solidity · v0.8.26+commit.8a97fa7a
Optimization
Yes · 20000 runs
EVM Version
shanghai
Source
Mirrored from Robinhood Chain explorer
Contract Source Code
Outline
C MarketHoursToken
ƒ transfer
ƒ approve
ƒ transferFrom
ƒ _transfer
ƒ isMarketOpen
ƒ nextOpen
ƒ nextClose
ƒ isOpenAt
ƒ nextOpenAfter
ƒ _easternOffset
ƒ _nthSundayUtc
ƒ _daysFromCivil
ƒ _yearOf
MarketHoursToken.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.26;
/// @title Market Hours Token
/// @notice An ERC-20 that keeps stock-market hours. Transfers clear only
/// Monday-Friday, 9:30 AM - 4:00 PM America/New_York (the NYSE regular
/// session), DST-aware, computed on-chain from block.timestamp.
/// Outside the session every transfer reverts with the timestamp of the
/// next opening bell. No pause switch, no fee, no allowlist, no upgrade
/// path: nobody can freeze, block, tax or seize anything, ever.
/// There is NO admin, NO owner and NO escape hatch: not even the
/// deployer can switch the market hours off. The clock is the contract.
/// @dev US DST rule hardcoded as legislated since 2007: EDT from the second
/// Sunday of March 02:00 to the first Sunday of November 02:00. If
/// Congress ever changes the rule, this token keeps the old one. The
/// clock is therefore only correct from 2007-03-11 onward; it answers
/// earlier instants with today's rule and can be an hour out on them.
/// @dev MarketClosed does not survive a router. Uniswap's TransferHelper
/// wraps the token call and re-reverts with Error("TF") on a buy and
/// Error("STF") on a sell, so a swap attempted outside the session
/// surfaces a generic transfer failure rather than this token's own
/// error. Only a direct transfer/transferFrom returns
/// MarketClosed(opensAtUtc), selector 0x9dc30b8e. This is router
/// behaviour and applies to any token that restricts transfers; it
/// cannot be changed from here, because TransferHelper discards custom
/// errors by design. Interfaces should call isMarketOpen() before
/// offering a trade rather than interpreting a revert reason.
/// @dev Integration notes: a zero-value transfer is gated like any other, so
/// accounting pokes fail outside the session; approve() works around the
/// clock but there is no EIP-2612 permit; transfers to address(0)
/// succeed while totalSupply is immutable, so burning that way leaves
/// totalSupply overstating the float.
contract MarketHoursToken {
string public name;
string public symbol;
uint8 public constant decimals = 18;
uint256 public immutable totalSupply;
mapping(address => uint256) public balanceOf;
mapping(address => mapping(address => uint256)) public allowance;
/// @notice Eastern-time day number of the last session that traded.
uint256 public lastSessionDay;
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
/// @notice Rung by the first transfer that clears on each trading day.
/// @dev Any address can ring it with a zero-value transfer at its own
/// gas cost, so treat it as "the session opened", not as a trade.
/// It cannot be suppressed or repeated within a session.
event OpeningBell(uint256 indexed easternDay);
error MarketClosed(uint256 opensAtUtc);
uint256 private constant OPEN = 9 hours + 30 minutes; // 09:30 ET
uint256 private constant CLOSE = 16 hours; // 16:00 ET
constructor(string memory name_, string memory symbol_, uint256 supply) {
name = name_;
symbol = symbol_;
totalSupply = supply;
balanceOf[msg.sender] = supply;
emit Transfer(address(0), msg.sender, supply);
}
/// @notice Send tokens. Reverts MarketClosed(opensAtUtc) outside the session, a zero-value transfer included.
function transfer(address to, uint256 value) external returns (bool) {
_transfer(msg.sender, to, value);
return true;
}
function approve(address spender, uint256 value) external returns (bool) {
allowance[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;
}
function transferFrom(address from, address to, uint256 value) external returns (bool) {
uint256 allowed = allowance[from][msg.sender];
if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - value;
_transfer(from, to, value);
return true;
}
function _transfer(address from, address to, uint256 value) internal {
{
if (!isOpenAt(block.timestamp)) revert MarketClosed(nextOpenAfter(block.timestamp));
uint256 day = (block.timestamp - _easternOffset(block.timestamp)) / 1 days;
if (day != lastSessionDay) {
lastSessionDay = day;
emit OpeningBell(day);
}
}
balanceOf[from] -= value;
balanceOf[to] += value;
emit Transfer(from, to, value);
}
// ------------------------------------------------------------------
// The clock. All pure; UIs and bots can call these for any timestamp.
// ------------------------------------------------------------------
function isMarketOpen() external view returns (bool) {
return isOpenAt(block.timestamp);
}
/// @notice UTC timestamp of the next opening bell (now, if the market is open).
function nextOpen() external view returns (uint256) {
return nextOpenAfter(block.timestamp);
}
/// @notice UTC timestamp of the next closing bell.
function nextClose() external view returns (uint256) {
uint256 t = nextOpenAfter(block.timestamp);
uint256 day = (t - _easternOffset(t)) / 1 days;
return day * 1 days + CLOSE + _easternOffset(t);
}
/// @notice True during the regular session at the given UTC instant.
/// @dev Accurate from 2007-03-11 onward (see the DST note on the
/// contract). Reverts for ts < 18000: subtracting the Eastern
/// offset underflows, so do not call it with 0 as a sentinel.
function isOpenAt(uint256 ts) public pure returns (bool) {
uint256 eastern = ts - _easternOffset(ts);
uint256 dow = (eastern / 1 days + 4) % 7; // 0 = Sunday
if (dow == 0 || dow == 6) return false;
uint256 s = eastern % 1 days;
return s >= OPEN && s < CLOSE;
}
/// @notice The next opening bell at or after ts; ts itself when open.
/// @dev Always lands on an instant where isOpenAt is true and the second
/// before it is false. The trailing revert cannot be reached: any
/// weekday after `day` opens later than ts, and any 7 consecutive
/// days contain a weekday.
function nextOpenAfter(uint256 ts) public pure returns (uint256) {
if (isOpenAt(ts)) return ts;
uint256 day = (ts - _easternOffset(ts)) / 1 days;
for (uint256 i = 0; i < 8; i++) {
uint256 d = day + i;
uint256 dow = (d + 4) % 7;
if (dow == 0 || dow == 6) continue;
uint256 openEastern = d * 1 days + OPEN;
// Offset probed 12h past the bell: the nearest DST switch (a Sunday
// 06:00/07:00 UTC) is always further away, so this is exact.
uint256 openUtc = openEastern + _easternOffset(openEastern + 12 hours);
if (openUtc > ts) return openUtc;
}
revert(); // unreachable: any 8-day window holds a weekday bell
}
/// @dev Seconds behind UTC: 4h during EDT, 5h during EST.
function _easternOffset(uint256 ts) internal pure returns (uint256) {
uint256 y = _yearOf(ts);
uint256 dstStart = _nthSundayUtc(y, 3, 2) + 7 hours; // 02:00 EST
uint256 dstEnd = _nthSundayUtc(y, 11, 1) + 6 hours; // 02:00 EDT
return (ts >= dstStart && ts < dstEnd) ? 4 hours : 5 hours;
}
/// @dev 00:00 UTC of the n-th Sunday of the given month.
function _nthSundayUtc(uint256 y, uint256 m, uint256 n) private pure returns (uint256) {
uint256 first = _daysFromCivil(y, m, 1);
uint256 dow = (first + 4) % 7; // 0 = Sunday
uint256 date = 1 + ((7 - dow) % 7) + 7 * (n - 1);
return _daysFromCivil(y, m, date) * 1 days;
}
// Howard Hinnant's civil-date algorithms.
function _daysFromCivil(uint256 y, uint256 m, uint256 d) private pure returns (uint256) {
unchecked {
y -= m <= 2 ? 1 : 0;
uint256 era = y / 400;
uint256 yoe = y - era * 400;
uint256 doy = (153 * (m > 2 ? m - 3 : m + 9) + 2) / 5 + d - 1;
uint256 doe = yoe * 365 + yoe / 4 - yoe / 100 + doy;
return era * 146097 + doe - 719468;
}
}
function _yearOf(uint256 ts) private pure returns (uint256) {
unchecked {
uint256 z = ts / 1 days + 719468;
uint256 era = z / 146097;
uint256 doe = z - era * 146097;
uint256 yoe = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365;
uint256 doy = doe - (365 * yoe + yoe / 4 - yoe / 100);
uint256 mp = (5 * doy + 2) / 153;
return yoe + era * 400 + (mp >= 10 ? 1 : 0);
}
}
}Contract ABI
[
{
"type": "constructor",
"inputs": [
{
"name": "name_",
"type": "string",
"internalType": "string"
},
{
"name": "symbol_",
"type": "string",
"internalType": "string"
},
{
"name": "supply",
"type": "uint256",
"internalType": "uint256"
}
],
"stateMutability": "nonpayable"
},
{
"name": "MarketClosed",
"type": "error",
"inputs": [
{
"name": "opensAtUtc",
"type": "uint256",
"internalType": "uint256"
}
]
},
{
"name": "Approval",
"type": "event",
"inputs": [
{
"name": "owner",
"type": "address",
"indexed": true,
"internalType": "address"
},
{
"name": "spender",
"type": "address",
"indexed": true,
"internalType": "address"
},
{
"name": "value",
"type": "uint256",
"indexed": false,
"internalType": "uint256"
}
],
"anonymous": false
},
{
"name": "OpeningBell",
"type": "event",
"inputs": [
{
"name": "easternDay",
"type": "uint256",
"indexed": true,
"internalType": "uint256"
}
],
"anonymous": false
},
{
"name": "Transfer",
"type": "event",
"inputs": [
{
"name": "from",
"type": "address",
"indexed": true,
"internalType": "address"
},
{
"name": "to",
"type": "address",
"indexed": true,
"internalType": "address"
},
{
"name": "value",
"type": "uint256",
"indexed": false,
"internalType": "uint256"
}
],
"anonymous": false
},
{
"name": "allowance",
"type": "function",
"inputs": [
{
"name": "",
"type": "address",
"internalType": "address"
},
{
"name": "",
"type": "address",
"internalType": "address"
}
],
"outputs": [
{
"name": "",
"type": "uint256",
"internalType": "uint256"
}
],
"stateMutability": "view"
},
{
"name": "approve",
"type": "function",
"inputs": [
{
"name": "spender",
"type": "address",
"internalType": "address"
},
{
"name": "value",
"type": "uint256",
"internalType": "uint256"
}
],
"outputs": [
{
"name": "",
"type": "bool",
"internalType": "bool"
}
],
"stateMutability": "nonpayable"
},
{
"name": "balanceOf",
"type": "function",
"inputs": [
{
"name": "",
"type": "address",
"internalType": "address"
}
],
"outputs": [
{
"name": "",
"type": "uint256",
"internalType": "uint256"
}
],
"stateMutability": "view"
},
{
"name": "decimals",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "uint8",
"internalType": "uint8"
}
],
"stateMutability": "view"
},
{
"name": "isMarketOpen",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "bool",
"internalType": "bool"
}
],
"stateMutability": "view"
},
{
"name": "isOpenAt",
"type": "function",
"inputs": [
{
"name": "ts",
"type": "uint256",
"internalType": "uint256"
}
],
"outputs": [
{
"name": "",
"type": "bool",
"internalType": "bool"
}
],
"stateMutability": "pure"
},
{
"name": "lastSessionDay",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "uint256",
"internalType": "uint256"
}
],
"stateMutability": "view"
},
{
"name": "name",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "string",
"internalType": "string"
}
],
"stateMutability": "view"
},
{
"name": "nextClose",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "uint256",
"internalType": "uint256"
}
],
"stateMutability": "view"
},
{
"name": "nextOpen",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "uint256",
"internalType": "uint256"
}
],
"stateMutability": "view"
},
{
"name": "nextOpenAfter",
"type": "function",
"inputs": [
{
"name": "ts",
"type": "uint256",
"internalType": "uint256"
}
],
"outputs": [
{
"name": "",
"type": "uint256",
"internalType": "uint256"
}
],
"stateMutability": "pure"
},
{
"name": "symbol",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "string",
"internalType": "string"
}
],
"stateMutability": "view"
},
{
"name": "totalSupply",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "uint256",
"internalType": "uint256"
}
],
"stateMutability": "view"
},
{
"name": "transfer",
"type": "function",
"inputs": [
{
"name": "to",
"type": "address",
"internalType": "address"
},
{
"name": "value",
"type": "uint256",
"internalType": "uint256"
}
],
"outputs": [
{
"name": "",
"type": "bool",
"internalType": "bool"
}
],
"stateMutability": "nonpayable"
},
{
"name": "transferFrom",
"type": "function",
"inputs": [
{
"name": "from",
"type": "address",
"internalType": "address"
},
{
"name": "to",
"type": "address",
"internalType": "address"
},
{
"name": "value",
"type": "uint256",
"internalType": "uint256"
}
],
"outputs": [
{
"name": "",
"type": "bool",
"internalType": "bool"
}
],
"stateMutability": "nonpayable"
}
]Creation code isn’t shown — this contract was deployed by a factory (internal CREATE), so it has no standalone creation transaction.
Deployed Bytecode
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Loading…
0 tokens · $0 total value
| Token | Symbol | Balance | Price | Value |
|---|---|---|---|---|
| no token holdings | ||||
A 1200×630 shareable card — also used as the social preview when this page is linked on X, Discord, etc.
Address
0x4ec7150fc4f2090a8f3352df6cf4d8a206749304
Type
ERC-20 Token
Bytecode Size
3427 bytes
Balance
0 ETH
A contract address hosts a smart contract — a set of code functions that can execute independently of any centralized server. Learn more in our Knowledge Base.