You need to provide much more in terms of requirements
* what device must it work with? * what operating system? * what driver/API must it support? * what applications are to be used with it? * is it for reading standard ISO-14443A or do you need Mifare, Felica etc? * is it for EMV certified credit card transactions? * what are the physical dimensions of the slot and clearance it must have?
Generally speaking NFC dongles are cumbersome and unreliable ( eg the ACS ACR-35 ) you are far better for robustness, support and reliability getting a main device with NFC already as a feature.
mckenndk: What I want to achieve is to be able to top up my snapper card without having to keep my old phone or go into the shop to top it up.
It's a Huwaei G8 and has an internal SD card slot, that can also take a second sim instead of the SD card.
It's not possible to do what you want to do.
NFC capable micro SD cards are designed to view or transfer content on the SD card when it's removed from the phone. They have no way of communicating with the phone via API.
A self contained SD card implementation of NFC will be unlikely due to the antenna requirements. NFC phones have the antenna as part of the case, the removable back or on a special battery.
A working NFC SD-card would need to have an external antenna either as a protruding lump or on a cable.
There were early NFC SIMs that worked in non NFC phones, these looked like normal SIMs except they had an attached antenna which had to be carefully laid out inside the phone casing. The standard solution now is putting the antenna as part of the NFC phone itself and using single-wire-protocol (SWP) NFC USIMs.
The OTG and Feeder, while it does work, does suffer from the dongle problem of additional connections which aren't particularly reliable. In a clean-room laboratory it works, in a bus-stop in the rain it is likely to be unsatisfactory.
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