The study assessed the transaction cost of Melon ‘egusi’ in Bida Local Government Area (LGA) of Niger State, Nigeria. A Multi-stage sampling procedure was used to draw samples from the study area. Data collected with the aid of questionnaire were analyzed using descriptive and inferential statistics, as well as gross margin analysis. The results revealed that majority (57%) of the sample marketers were males. Also, the results revealed that larger proportion of these actors were between the ages of 36 and 40 years with a mean age of 38 years. Majority (77%) of the marketers were married, with larger proportion (30.0%) having marketing experience of between 6-10 years. The mean marketing experience was 13 years. Larger proportion (33.0%) of the respondents had between 6-10 persons as family size, with a mean household size of approximately 11 persons. Majority (81.0%) had one form of modern education stitches or the other. The effect of marketing cost on final price of melon in the study area showed an R2 value of 0.685. However, the variables such as cost of loading, cost of offloading, distance from the farm to market, quantity of melon transported to the market and cost of transportation were positively related to the final price of marketing melon. The significant variables that influence the final price were; cost of loading, cost of off-loading, and distance from farm to the market. Cost of loading and distance to the market were significant at P≤0.01 Also, the coefficient for cost of off-loading was significant at 10%. The generated revenue from the sales of melon was N35,093.33, whereas, the total costs incurred from the melon marketing was N32,645.0, with a net income of N2,448.30. The constraints to melon marketing in the study area include; poor feeder road (68.3%), price instability (66.7%), and low demand/supply (31.7%). It was recommended that government and other stakeholders should help provide good marketing infrastructure for efficient marketing such as good feeder roads that link the rural areas to major cities/major consuming centres. It was also recommended that there should be regular capacity building to empower the marketers to acquire skills for effective negotiations so as to reduce transaction costs (loading, off-loading, security) and farm gate price will reduce the final price.