# Universal Access Schema (UAS)

The **Universal Access Schema** is a standardized, deterministic URL format that makes any verified on-chain asset instantly reachable — anywhere a link can be placed.

No APIs.\
No SDKs.\
No contracts to deploy.\
Just a link that routes intent through the ONCHAIN® stack.

### The Format

> <https://buy.onchain.money/\\[chain]/\\[address>]

### What the Schema Represents

Each link encodes a **BuyIntent** specifying:

1. **Chain**
2. **Token contract**
3. **Verified metadata (via Smart Guardrails)**
4. **Execution path (via OPN)**

Click → Payment → Deterministic on-chain settlement.

### Supported Chains

| Chain           | Slug     | Status    |
| --------------- | -------- | --------- |
| Ethereum        | ethereum | Supported |
| Base            | base     | Supported |
| BNB Chain       | bnbchain | Supported |
| Polygon         | polygon  | Supported |
| Solana          | solana   | Imminent  |
| Additional EVMs | varies   | Planned   |

### Example Links

**Direct Token**

```html
buy.onchain.money/base/0x1234abcd…
```

**Telegram Bot**

```js
"Buy → https://buy.onchain.money/" + chain + "/" + address
```

**Website CTA**

```html
<a href="https://buy.onchain.money/polygon/0xABC...">Buy with ONCHAIN</a>
```

### What Happens When a User Opens a Link

1. Gateway loads token context
2. User selects payment method
3. Payment is verified
4. Gateway broadcasts a BuyIntent
5. OPN executes deterministically
6. Tokens settle directly to the user’s wallet

No bridges.\
No wrapping.\
No custody.\
No redirects.

Access becomes a primitive.