This paper explores the problem of flow metering in 100 GbE links, presenting a flow exporter architecture based on a FPGA acceleration card using only on-chip memory. Peak performance without packet sampling even at the maximum packet rate is assured and means to avoid data loss are provided, since a low level of aggregation is achieved. This is the first approach in a series of architectures that are built upon the previous one, where the resources of the custom hardware are gradually increased, improving the aggregation level, while the required commodity hardware resources for subsequent stages are consequently lowered. We consider that FPGA-fabric offers adequate flexibility and performance for this task and is capable of reducing overall system cost. A functional prototype of the system has been implemented on the Xilinx VCU118 development board configured to export TCP sessions records. This achievement represents a cornerstone of a 100 GbE FPGA flow exporter design, that aims for supporting in the order of tens of millions concurrent flows.