Skip to main content

​
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.
Currently only available via REST API.

​
Supported Networks

​
Supported Tokens

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

​
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
For most use cases, the default allowance_holder method is recommended as it’s simpler to implement.