Currently, it is difficult to accurately predict which coin will be the most promising, as the cryptocurrency market often changes and depends on many factors. However, here are a few cryptocurrencies that may be interesting for long-term or short-term investment if you are looking for inexpensive coins:

1. VeChain (VET)

- Price: An inexpensive coin, often fluctuating within a few cents.

- Prospects: VeChain uses blockchain to manage supply chains and logistics, which can significantly improve processes for various industries such as manufacturing, healthcare, and others.

2. Stellar (XLM)

- Price: Costs a few cents.

- Prospects: Stellar focuses on simplifying global financial transactions and helps provide access to financial services for people in developing countries.

3. Shiba Inu (SHIB)

- Price: A very cheap coin, worth fractions of a cent.

- Prospects: Although SHIB is popular as a meme coin, its ecosystem is actively developing, including the creation of decentralized finance (DeFi) and the metaverse. However, caution is advised, as such coins can be highly volatile.

4. Cardano (ADA)

- Price: Around a few dollars, but generally affordable for purchase compared to leading cryptocurrencies.

- Prospects: Cardano is actively developing its blockchain, offering solutions for decentralized applications (dApps) and smart contracts with a focus on security and scalability.

5. Polygon (MATIC)

- Price: Up to 1 dollar.

- Prospects: Polygon is working on improving scalability and reducing transaction costs for the Ethereum blockchain, making it one of the most promising coins in the DeFi ecosystem.

6. Algorand (ALGO)

- Price: Up to 1 dollar.

- Prospects: Algorand has one of the fastest and most scalable platforms for creating smart contracts and decentralized applications, which gives it a good foundation for future growth.

When choosing the most promising cryptocurrencies, it is also important to consider factors such as the project team, its target audience, the level of technology application, and overall trends in the cryptocurrency ecosystem.

It is important to remember that the cryptocurrency market is volatile, and investments always carry risks. Always conduct your own research before making investment decisions.