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title: "Overview · ST0x developer docs"
url: https://st0x.io/docs
format: markdown rendering of the HTML page
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Developer docs

# Overview

What you’re integrating and where to start.

ST0x tokens are ERC-20 tokens for real, listed stocks, issued by S01 Issuer GmbH on Base, Ethereum, HyperEVM, Robinhood Chain and BNB Smart Chain. They behave like other ERC-20s with three differences: tStock balances change when a stock splits, transfers can stop in a few cases, and each wtStock grows in tStock as dividends arrive. These docs cover each one.

## What you’re integrating

-   **tStock**: the issued token. One tStock carries a right, against S01, to one share. It rebases: balances change when the stock splits.
-   **wtStock**: an ERC-4626 wrapper around tStock. Balances never change with corporate actions, so it’s the form pools, vaults and lending markets use.
-   **Receipts**: every mint leaves an ERC-1155 receipt onchain, so you can trace supply back to each issuance.

[Read the concepts](/docs/concepts).

## Start here

1.  Find the token’s contracts on its [token page](/tokens): every chain, tStock and wtStock.
2.  Choose the form: wtStock for DeFi, tStock to hold the issued token directly ([compare them](/docs/concepts#tstock-and-wtstock)).
3.  For wtStock, read how much tStock each one holds with `convertToAssets(1e18)`, on the chain you’re using.
4.  Handle [splits and dividends](/docs/corporate-actions), and the cases where [transfers can stop](/docs/concepts#controls).
5.  If you lend against it, follow the [pricing guide](/docs/pricing).

A public API, token list and MCP server are coming soon.

## Indexing mints and burns

Each tStock contract is paired with an ERC-1155 receipt contract, and every mint creates a receipt. To index supply, follow these events on the tStock:

-   Mint: `Deposit(address sender, address owner, uint256 assets, uint256 shares, uint256 id, bytes receiptInformation)`
-   Burn: `Withdraw(address sender, address receiver, address owner, uint256 assets, uint256 shares, uint256 id, bytes receiptInformation)`

Authorised Participants request mints and burns; S01’s operational roles carry them out. Anyone can transfer tStock, with no allowlist, except in the cases where [transfers can stop](/docs/concepts#controls).

## Upgrades and source

Token contracts are beacon proxies. Any logic change goes through a Safe multisig and a 48-hour timelock, so you can see it coming. The contracts are open source:

-   [rain.vats (receipt vault, receipts)](https://github.com/rainlanguage/rain.vats)
-   [st0x.deploy (wtStock wrapper and deployment)](https://github.com/S01-Issuer/st0x.deploy)

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Risk warning

You are about to purchase a product that is not simple and may be difficult to understand. The Products bear the risk that Investors may lose all or part of the invested capital. Products are unsecured debt instruments of the Issuer. Investors are exposed to the credit risk of the Issuer. The Products are not capital protected and are not covered by any deposit protection or Investor compensation scheme.

Source: Base Prospectus, 30 March 2026, pp. 8 and 17.

Eligibility

Not for US persons or sanctioned persons. Offered to the public under the Base Prospectus in Liechtenstein, Germany, Luxembourg, France, Spain and Italy and other EEA states notified under Article 25. Minting and redemption with the issuer require an Eligible Broker account and onboarding. [Full eligibility](/legal#eligibility).

Source: Base Prospectus, 30 March 2026, pp. 1, 3, 24, 38 and 69.