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If the books are protected via DRM, any such system has to be handled by the vendor. There's no room for a 3rd party service in that respect.
If you try to strip the DRM, you will not be able to enact your system without likely running afoul of the DMCA or being accused of piracy, unauthorized duplication or sale, and so forth.
If the books are not protected via DRM (or if you stripped the DRM), there is no longer any enforcement mechanism, so the idea of "trading" is rather superfluous. I.e. I could just send you the file without wiping it out from my machine; there is no protection, so no real reason for me to do anything other than just give it to you.
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