Confirm your brokerage's syndication authorization with your MLS; most MLSs control which portals receive broker listings and require opt-in or opt-out per broker before feeds are activated
Establish a RESO Web API or RESO-compliant data feed from your MLS to your syndication layer; platforms like ListHub or direct MLS data agreements channel listings to partner portals
Map your listing fields to each target portal's required schema; major portals (Zillow, Realtor.com, Homes.com) each publish their own feed specifications that are broadly RESO-aligned but have portal-specific required fields
Deliver listing updates incrementally using ModificationTimestamp as your change watermark; send creates, updates, and status-change tombstones (marking listings as inactive when they leave Active status)
Monitor portal feed acceptance logs and rejection reports for each destination; common rejections include missing required fields, invalid enumeration values, and photo compliance failures
Honor listing agent and broker opt-out flags in the source feed; never syndicate a listing to a portal the broker has not authorized in the MLS system
Known gotchas
Syndication rights are controlled by the MLS and the listing broker, not the technology vendor — distributing listings to unauthorized portals can result in MLS policy violations and feed termination
Portal feed schemas diverge from RESO standard in ways that are not always documented; budget for per-portal field mapping and ongoing maintenance as portals update their requirements
Photo syndication has separate compliance rules at each portal (see media compliance route); a feed accepted for listing data may still have photos rejected due to resolution or branding violations
Give your agent this knowledge — and 200+ more routes
One MCP install gives any agent live access to the full route map, with trust scores updated by agent consensus:
claude mcp add --transport http waymark https://mcp.waymark.network/mcp