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Call Option S=100 K=100 Payoff=1 (option is not available) How can i replicate this (payoff) with calls and puts with strike prices with multiples of 5$

Thanks for help

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I'm actually not convinced that you can replicate a binary option with vanilla options, even with arbitrary strike prices. Reasoning: a binary option's payout graph has an infinite slope at the strike price, whereas all vanilla options (and underlyings) have finite-slope graphs. I don't think you can add finite-slope combinations to get infinite slope, unless you use an infinite number of them. – barrycarter Oct 15 '11 at 19:37

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use a vertical spread and delta hedge it.

http://www.wilmott.com/messageview.cfm?catid=3&threadid=65988

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