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Siren FX_Benchmark Factsheet November 2022 (pdf)Download

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FX markets and Last Look

In eFX spot markets “last look” is the name given to a window of time where the market-maker has the option to reject the trade. It is a controversial topic and one highlighted within the FX code of conduct.
There are pros and cons to the usage of last look:


Advantages

  • Allows liquidity providers to display greater liquidity on each venue.
  • Allows generally tighter bid/ask spreads on each venue.
  • Protects markets from liquidity arbitrageurs who may cause wider spreads for all market paricipants.
  • Allows top of book prices to be more stable (lower update frequency).

Disadvantages

  • Liquidity takers have no certainty of fill.
  • Liquidity takers need to return to market after a period of time where they are exposed to market movements.
  • Trades are more likely to be rejected in volatile markets.
  • Liquidity takers need clarity over why a trade has been rejected and assurances that the information about the trade has not been misused.

Academic Paper 

In this paper, Jamie Walton with his co-authors quantify the cost of the last look option and suggest the reduction in spreads that may result as a result of last look liquidity.

  • https://papers.ssrn.com/sol3/papers2.cfm?abstract_id=2630662

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SIREN FX Benchmark White Paper

SIREN Benchmark for FX whitepaper 3.11 copy (pdf)Download

Last look (pdf)

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