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HEX on Ethereum network 
On-chain HEX token swap (Decentralized exchanges – DEX)
Warning: Network fees on Ethereum mainnet can be extremely expensive in times of network congestion. Layer 1 on-chain exchanges consume a lot gas. Also, be careful and do your own research on exchange services – information here may be outdated.
Uniswap: A custom DeFi Uniswap smart contract v1, v2 and v3 frontend with HEX preselected. Increase the Transaction deadline on Uniswap settings to prevent transaction timeouts. Other DeFi Uniswap frontends that can be used: Hedron’s Uniswap frontend and IPFS Uniswap frontend (Note: DeFi versions of Uniswap frontends are constantly under attack by DeFi opponents who report them as “phishing sites”, so many browsers often give an unsafe website warning – you can verify by checking the contract address while signing).
1inch Exchange: DEX aggregator that allows limit orders. Searches for the best deal and executes trade. Beware of more expensive Ethereum fees. 1inch requires USA IP addresses to use a VPN.
PortalX: Cross-chain liquidity aggregator that can swap cryptocurrencies from Ethereum and other networks into HEX and back.
CowSwap – Meta DEX aggregator: Aggregates DEX liquidity, offers lower fees and MEV protection.
Metric Exchange: DEX using the 0x protocol. Allows limit HEX/USDC orders on an order book.
Matcha: DEX aggregator that allows limit orders.
Bamboorelay: HEX/WETH pair only.
KyberSwap: DEX aggregator.
Paraswap: DEX aggregator.
Shapeshift DEX: DEX aggregator.
Coinbase wallet: If you use this wallet, you can buy HEX within it.
Rabby wallet: If you use this wallet, you can buy HEX within it. Rabby is likely the best crypto wallet currently available.
Renbridge: Bitcoin (BTC), Zcash (ZEC), Bitcoin Cash (BCH) and Dogecoin (DOGE) can be wrapped onto the Ethereum network trough RenBridge and the wrapped coins swapped to HEX using Uniswap or other DEX, or using the 1inch DEX aggregator.
Direct fiat money on-ramps / off-ramp
ChangeNow: Allows debit card purchases up to 3000 USD daily, or SEPA transfer purchases up to 5000 EUR daily. Has its own liquidity, so it only charges an ERC-20 transfer network fee and is therefore the cheapest direct fiat money option.
Guardarian: Allows purchases using debit card and SEPA.
Indacoin: Debit card purchase, not for USA citizens.
Centralized exchanges (CEX)
List of centralized exchanges supporting HEX: HEX is listed on dozens of CEX. However, these require custody of funds and thus represent counterparty risks. If you have to use them, make sure you chose a trustworthy exchange with a good reputation.
Coinswitch: Aggregates liquidity from centralized exchanges; no KYC.
Changelly: Aggregates liquidity from centralized exchanges; no KYC.
ChangeNow: Aggregates liquidity from centralized exchanges; no KYC.
Atomic cryptocurrency wallet: Allows swapping HEX within the wallet and uses Changelly and ChangeNow.
A good option is also to buy ETH on a trusted and reputable CEX, such as Bitstamp, Kraken, or Coinbase, and then swap that ETH for HEX on Uniswap.
Pulsechain network
Bridged Ethereum HEX is available on Pulsechain network (bridged token address: 0x57fde0a71132198bbec939b98976993d8d89d225). Currently most Ethereum HEX on-chain liquidity is actually on Pulsechain network.
PulseX exchange: Largest DEX on Pulsechain.
Phux exchange: A DEX on Pulsechain using the Balancer protocol.
Layer 2 exchanges
HEX bridges to Polygon and xDai are currently available. Transactions on layer 2 cost nearly nothing and are very fast, but layer 1 fee still needs to be paid for the bridge contract when transferring between layers. For this reason, layer 2 is currently mainly only useful for traders, or for cost averaging in or out.
Layer 2 solutions are not as secure and decentralized as mainnet, but they allow scalability.
Polygon network
Quickswap on Ethereum Polygon (Matic) layer 2 network has the largest HEX liquidity on layer 2 and decent volume (currently about 0.5M USD liquidity on each side and 100-200k USD daily volume). It is an AMM based DEX that is a 100% fork of Uniswap v2, thus audited and battle tested. Limit orders are available trough Sorbet finance contract.
Paraswap can be used on Polygon network. It is a DEX aggregator similar to 1inch.
Sushiswap on Polygon occasionally has tiny amounts of liquidity for HEX, but is currently not useful.
Transak.com allows direct fiat money onramp to Polygon network trough Matic by using SEPA bank transfer or debit card. Matic can then be swapped for HEX using one of the above DEXes.
Gnosischain network
Honeyswap on the Ethereum xDai layer 2 network has HEX listed, but there is little liquidity available at the moment.
zkRollup
Loopring exchange using zkRollup layer 2 technology currently has a very small liquidity for HEX. Please check the price slippage before swapping.
Leverage and margin trading
Leverage trading is a zero sum game and extremely risky. The vast majority of leverage traders lose money, waste a lot of time in front of the screen, and destroy their health and relationships. Even the few that are good at it are generally being outperformed by hodlers holding assets with a good product-market fit. Do not leverage trade! If you cannot help yourself, limit yourself to minimal leverage, because cryptocurrencies are very volatile and your positions will get liquidated.
50x.com: A centralized trading platform that allows leverage trading of the HEX/USDT pair. Has a large order book spread and low volume.
Unimex: Decentralized trading platform that allows margin trading of the HEX/USDC pair. Do your own research on the contract.
HEX on Pulsechain network 
Add Pulsechain network RPC settings to your software wallet at Pulsechain.com or use pulsechain.vercel.app (can add tokens to your Metamask)
On-chain HEX token swap (Decentralized exchanges – DEX)
PulseX exchange: Largest DEX on Pulsechain.
Phux exchange: A DEX on Pulsechain using the Balancer protocol.
9mm exchange: A fork of Uniswap v3 on Pulsechain.
9inch exchange: A DEX on Pulsechain.
PortalX: A liquidity aggregator for Pulsechain.
Uniswap v3 on Pulsechain: A DEX on Pulsechain which however has a much lower AMM liquidity for HEX.
Piteas: A liquidity aggregator for Pulsechain.
GoPulse: A liquidity aggregator for Pulsechain.
Cross-chain exchanges
PortalX: A cross-chain liquidity aggregator for Pulsechain.
Centralized exchanges (CEX)
Bitcointry (HEX/USDT): A centralized exchange listing a pair with USDT.
Direct fiat money on-ramps / off-ramp
A direct fiat on-ramp to Pulsechain is available at Coast – PulseChain Fiat On-Ramp. They issue their own stablecoin CST which is redeemable for USD and has on-chain liquidity at PulseX and Phux (CST contract address is 0x600136dA8cc6D1Ea07449514604dc4ab7098dB82).
Other direct fiat on-ramps to Pulsechain: ChangeNow
An indirect option is to buy the Pulsechain network utility token Pulse (PLS) and then swap it to HEX on the PulseX exchange. There are different ways to obtain PLS:
One can buy bridged PLS on Ethereum network on Uniswap and then bridge it over to Pulsechain network. A BSC-Pulsechain bridge is also available.
Or use a CEX, such as Bitcointry, Safe.trade, Xeggex, 50x, or others to buy PLS (Caution: do not hold your assets on a CEX account any longer than needed!).
There’s also a direct cross-chain swap of ETH to PLS via Buy PLS online (max 3000 USD). For even smaller amounts, Swap ETH to PLS is available for up to 200 USD worth.
Please note the the cryptocurrency world is very dynamic and services change all the time, fail, lose liquidity, or go of-line. Therefore, if you identify issues with any of the options above, please contact me and tell me about it.