> For the complete documentation index, see [llms.txt](https://docs.bscs.finance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bscs.finance/defi-1/ido-rules.md).

# IDO Rules

<figure><img src="https://1865655097-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-McirtdGWS2rHpxMYS9C%2Fuploads%2FgmfWipndSaBzi7D7PWN1%2FIDO%20Rule.png?alt=media&amp;token=a4211eee-e836-463d-98bf-8c68098205ff" alt=""><figcaption></figcaption></figure>

**The BSCS IDO Rule System** is crafted to safeguard investors while optimizing their experience through three distinct rules:

**💎** [**Riskless**](/defi-1/ido-rules/riskless.md) **IDO Rule:** Offers a simple, all-or-nothing refund mechanism for all participants.

**💎** [**Vanguard**](/defi-1/ido-rules/vanguard.md) **IDO Rule:** Provides flexible refund options, including partial refunds, for strategic flexibility.

{% hint style="info" %}
We will apply the specific IDO rule depending on each IDO project status.

These rules leverage a unified [Tier System](/defi-1/tier-system-and-allocation.md), where higher tiers (Unicorn and Decacorn) unlock extended refund windows and exclusive perks.
{% endhint %}

<figure><img src="https://1865655097-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-McirtdGWS2rHpxMYS9C%2Fuploads%2FmZbz4r9omdWeoE2uXY38%2FA%CC%89nh%20ma%CC%80n%20hi%CC%80nh%202025-04-03%20lu%CC%81c%2013.52.39.png?alt=media&amp;token=4d96b4f7-e35f-4f27-b884-d412ac7c2f3f" alt=""><figcaption></figcaption></figure>