The best alternatives to Smokex are Requestly, Endpoints, and RequestBin. If these 3 options don't work for you, we've listed a few more alternatives below.
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Requestly was built to save developers time by intercepting and modifying HTTP Requests. It has now developed into an open-source alternative to Charles Proxy and Telerik Fiddler that works directly in browsers without VPN and proxy Issues. It is used by more than 250k front-end developers and 11,000+ companies worldwide.
HTTPDump is an app to debug webhook and check the data flowing through your APIs/webhook, You can dump any data on us and check what's going on. One step ahead from requestb.in