# Listing requirements

This section outlines the regulatory, technical, and operational criteria for listing financial instruments on 21X. The requirements are organized into four key categories:

1. [**Admissible Instruments**](https://docs.21x.eu/participant-docs/listing-requirements/admissible-instruments) Overview of eligible asset classes, including shares, funds, and bonds, along with their specific conditions for listing on 21X.
2. [**Financial Instrument Requirements**](https://docs.21x.eu/participant-docs/listing-requirements/financial-instrument-requirements) General legal, structural, and documentation requirements that issuers and financial instruments must meet to qualify for listing.
3. [**Token Requirements**](https://docs.21x.eu/participant-docs/listing-requirements/token-requirements) Technical standards and protocols for tokenized assets, including supported blockchains, smart contract audits, and token functionality.
4. [**Stablecoin Requirements** ](https://docs.21x.eu/participant-docs/listing-requirements/stablecoin-requirements)Guidelines for e-money tokens used as settlement currencies on 21X, including compliance, technical specifications, and supported networks.

Each category provides detailed rules and FAQs to ensure clarity and compliance for issuers and listing sponsors.