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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.

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Supported Networks

NetworkChain ID
Optimism10

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Supported Tokens

The following tokens can be used as the offer or want asset:
TokenAddress (Optimism)
WPAXG0x5cb5c4d5e8b184a364534bc688da0553ccf8f484
USDC0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85

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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

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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.