This article describes what the Ethereum mempool is, why you should care, and how to monitor the Ethereum mempool from a Delphi app or service.

Before Ethereum transactions end up in a block, they are sitting in the mempool, waiting for miners to pick them up. Miners will pick transactions with the highest gas price first. In other words: the higher the gas price, the faster your transaction will get mined and the lower the gas price, the slower your transaction will get mined.

Let’s go back to the mempool itself for a moment. This is where pending, unconfirmed transactions…


WUTN (aka Wrapped UTN) is a token bridge for Universa’s UTNP token.

The purpose of this community-driven project is to allow for ETH-WUTN liquidity mining on Uniswap where you as a UTNP token holder can earn trading fees.

An idle asset is a wasted opportunity — Dan Elitzer

Unfortunately, the UTNP token itself does not allow for liquidity mining — or any other DeFi farming opportunity — because the UTNP contract does not implement approve().

approve() is the greatest feature of ERC20. Without it there would be no money legos. — Martin Lundfall

Cool. How do I wrap my UTNP…


This article describes what Bankless is, and how to set this app up.

What is Bankless?

Bankless is a DeFi desktop app with the highest possible yield on your stablecoin savings.

What is DeFi?

DeFi apps are blockchain-based financial apps that do what banks do (savings, loans, time deposits, mortgages, pensions, etc) without a bank. These apps are trustless and censorship resistant.

Why would you want to use Bankless?

  1. Bankless does not need MetaMask or a web browser. As a matter of fact, there is nothing else to install.
  2. Bankless shows all the available APYs in one simple screen.
  3. Bankless makes it super simple to earn double-digit yield on your stablecoins.
  4. Bankless is…


While Infura is an awesome gateway to Ethereum, when you have a high-traffic decentralized application then you might have a need for maximum performance, non-funnelled access to the blockchain.

Yes you can run your own Ethereum node, but setting up and managing a blockchain node is a difficult, time- and resource-consuming task. Not to mention that it is your responsibility to keep your node up to date with node and network upgrades.

QuikNode is a so-called remote node service that gives you all the power of a full-node without running one yourself. They have a free plan for developers, and…


This is part 12 in a series of articles on the Nefertiti trading bot. If you don’t know what Nefertiti is or does, please refer to part 1 in this series.

Nefertiti comes with a built-in strategy that is simple but proven; buy the dip, then sell those trades as soon as possible, preferably on the same day.

However, some traders might prefer an alternative strategy. Starting with Nefertiti 0.0.92 we’re pleased to announce a cooperation with MyCryptoParadise, an awesome team that sends trading signals to your phone.

The MyCryptoParadise team contains four successful traders with high skills of technical…


This is part 11 in a series of articles on the Nefertiti trading bot. If you don’t know what Nefertiti is or does, please refer to part 1 in this series.

Nefertiti comes with a built-in strategy that is simple but proven; buy the dip, then sell those trades as soon as possible, preferably on the same day.

However, some traders might prefer an alternative strategy. Starting with Nefertiti 0.0.110 we’re pleased to announce a cooperation with Hirn Signals, an awesome team that sends trading signals to your phone.

Hirn’s aim is to provide high quality crypto signals for taking…


In a previous article, we created a simple Smart Contract that did not do much other than output the message “Hello World!”

In this article, we will both read and write data to the blockchain. It is important to realize that while reading from the blockchain is free, writing to the blockchain will cost gas. If you don’t know what gas is or does, then please refer to this article.

Because we don’t want to spend any real-world ether on gas at this time, we will deploy our Smart Contract to the Ropsten test net. …


In this article, we will develop our first Smart Contract. Before we dive into the world of Smart Contracts, let us step back for a moment and look at what differentiates Ethereum from Bitcoin.

While Bitcoin is the mother of all blockchains, the Bitcoin business rules are pretty simple;

  1. Alice has zero Bitcoin
  2. Bob has 1 Bitcoin
  3. Bob transfers 1 Bitcoin to Alice
  4. Alice has 1 Bitcoin
  5. Bob has zero Bitcoin

These business rules are hard-coded into the protocol and as such there isn’t much Bitcoin can do other than store and transfer value.

Ethereum, on the other hand, can…


This is part 10 in a series of articles on the Nefertiti trading bot. If you don’t know what Nefertiti is or does, please refer to part 1 in this series.

Nefertiti comes with a built-in strategy that is simple but proven; buy the dip, then sell those trades as soon as possible, preferably on the same day.

However, some traders might prefer an alternative strategy. Starting with Nefertiti 0.0.79 we’re pleased to announce a cooperation with BullTrader Signals, an awesome Telegram bot that sends trading signals to your phone.

BullTrader Signals are based on an advanced algorithm that monitors…


Ethereum is amazing, breakthrough technology. For the 1st time in history, we can write financial apps that do what banks do (savings, loans, time deposits, insurances, mortgages, pensions, etc) without a bank.

While HTTP allowed anyone in the world to create an online service, ETH will allow anyone in the world to create a financial service.

And because Ethereum is pretty much decentralized (more so than other blockchains), it is censorship resistant and therefore unstoppable. The banks cannot shut the network down, and neither can governments.

But if we want the masses to adopt this technology, then we need…

Stefan

Delphi/Rust/Go developer. Ethereum consultant. Embarcadero MVP. Ex-Adobe, Macromedia. Helped build 1Password.

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