Request for Quote (RFQ)

Unlike anonymous order book matching, RFQ is a disclosed negotiation between a requester and a selected panel of liquidity providers. The requester broadcasts a specific inquiry—defining the instrument, direction (buy/sell), and notional size—to multiple dealers simultaneously. This creates a competitive auction for that specific block, allowing the requester to trade large sizes without revealing their full intention to the broader market and minimizing information leakage.

An RFQ quote is a binding, executable price with a finite lifespan, not an indicative signal. The lifecycle proceeds through strict states:

• Inquiry: Requester specifies CUSIP/ISIN, quantity, and direction.
• Quoting Window: Dealers submit firm bids or offers, typically within seconds.
• Quote Firmness: Once submitted, a quote is irrevocable for a defined window (e.g., 30 seconds), meaning the dealer must honor it if the requester executes.
• Execution or Pass: The requester trades on the best quote or lets the window expire.

Access to RFQ streams is permissioned and relationship-driven. A requester does not see quotes from the entire market; they only see prices from dealers with whom they have established a bilateral credit relationship and legal agreement (e.g., ISDA Master Agreement). This gatekeeping mechanism protects dealers from adverse selection by unknown counterparties and ensures that quoted prices are backed by a pre-negotiated credit line, making it the standard for credit-sensitive instruments like corporate bonds and interest rate swaps.

A controversial but common feature in electronic RFQ platforms is the Last Look mechanism. After a requester accepts a quote, the dealer has a final, sub-millisecond window to reject the trade if the market has moved against them. This protects the liquidity provider from latency arbitrage but can disadvantage the requester. Additionally, unlike Reg NMS equities, RFQ markets often lack a strict trade-through rule, meaning execution is not guaranteed at the best available quote across all platforms, prioritizing relationship execution over strict price priority.

Modern RFQ workflows are heavily automated through Auto-Quoting (AQ) engines. Instead of a human trader manually pricing each inquiry, algorithms ingest the RFQ request, calculate a price based on internal risk models, inventory, and market data, and stream a firm quote back within milliseconds. This enables dealers to handle thousands of daily inquiries across credit, rates, and FX without manual intervention, while embedding dynamic toxicity filters to detect and reject flow from potentially informed counterparties before quoting.

The protocol bifurcates into two execution styles:

• Snapshot RFQ: A one-shot auction where the requester asks for a price, receives quotes, and decides to execute or pass. Common for large, block-sized trades.
• Streaming RFQ: Dealers continuously stream executable prices to a requester's screen, which are refreshed in real-time. The requester clicks to trade on a live stream, combining the negotiation aspect of RFQ with the immediacy of a central limit order book. This is prevalent in spot FX and government bonds.