> ## Documentation Index
> Fetch the complete documentation index at: https://developers.paxoslabs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> Swap WPAXG (Wrapped Paxos Gold) on Optimism via DEX aggregators.

# WPAXG Swaps

The WPAXG Swap API enables buying and selling of WPAXG (Wrapped Paxos Gold) tokens on Optimism. The API returns ready-to-execute transaction calldata for swaps via DEX aggregators, handling liquidity sourcing and routing automatically.

<Info>
  Currently only available via REST API.
</Info>

## Supported Networks

| Network  | Chain ID |
| -------- | -------- |
| Optimism | 10       |

## Supported Tokens

The following tokens can be used as the offer or want asset:

| Token | Address (Optimism)                           |
| ----- | -------------------------------------------- |
| WPAXG | `0x5cb5c4d5e8b184a364534bc688da0553ccf8f484` |
| USDC  | `0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85` |

## How It Works

1. **Request a quote** — Call the swap quote endpoint with the offer asset, want asset, amount, and user address
2. **Review the quote** — The response includes the expected output amount, transaction calldata, and any required token approvals
3. **Execute the swap** — Submit the transaction using the provided calldata

## Authorization Methods

The API supports two authorization methods for token approvals:

* **`allowance_holder`** (default) — Standard ERC-20 approve flow using the AllowanceHolder contract
* **`permit2`** — Gasless approval using EIP-712 signed permits

<Info>
  For most use cases, the default `allowance_holder` method is recommended as it's simpler to implement.
</Info>