Question 1

What is Peer Orderbook?

Accepted Answer

Peer Orderbook is a free, public trading terminal that displays all active peer-to-peer USDC/fiat liquidity on the ZKP2P protocol. It shows live exchange rates, spreads relative to FX mid-rates, and depth across currencies and payment platforms — no wallet or login required.

Question 2

How do exchange rates work on the orderbook?

Accepted Answer

Makers can post fixed rates directly or delegate pricing to a rate manager that tracks oracle feeds with a configured spread. The orderbook shows each rate level with its spread relative to the live FX mid-rate and highlights whether liquidity is fixed, oracle-backed, or delegated.

Question 3

How do I buy or sell USDC through the orderbook?

Accepted Answer

Click any row in the orderbook to open the deposit on usdctofiat.xyz, where you can signal intent to buy USDC from that maker. To sell USDC, visit usdctofiat.xyz directly to create a deposit with your preferred rate and payment methods.

Question 4

What does depth mean in the orderbook?

Accepted Answer

Depth represents the total USDC liquidity available at each rate level. The depth bar visually shows how much liquidity exists relative to the largest level. More depth means more USDC is available for purchase at that rate.

Question 5

Where does the orderbook data come from?

Accepted Answer

All data is sourced from the Envio indexer, which indexes the currently supported ZKP2P production escrows on Base in real-time. Deposits refresh every 60 seconds and activity events every 15 seconds. FX mid-rates come from the Open Exchange Rates API.