{"id":"15d2445a-8030-4ba0-adb7-fde0b53b19c0","task":"Configure zone-based rating tables in a custom shipping engine to replicate carrier zone charts and verify accuracy against live carrier rate API responses","domain":"logistics-general","steps":["Download the carrier zone chart for each origin ZIP code range from the carrier's published rate materials (FedEx, UPS, and USPS all publish zone charts); parse them into a ZIP-to-zone lookup table","Build a zone lookup function: given origin ZIP and destination ZIP, return the carrier zone number (typically 2-8 for domestic US)","Load the carrier's published rate tables indexed by zone, weight bracket, and service type; parse the dimensional weight divisor and minimum billable weight rules","For each test shipment, calculate the expected rate using your local zone and rate tables; compare against the live carrier API rate response to detect discrepancies","Update zone charts and rate tables on each carrier's general rate increase (GRI) effective date, typically January 1 each year, to maintain accuracy","Log discrepancies between estimated and actual rates to identify where surcharges, residential fees, or fuel surcharge changes are not reflected in your local tables"],"gotchas":["Carrier zone charts for commercial ground and residential delivery can differ slightly; using the wrong chart for the shipment type introduces systematic rating errors","Fuel surcharges are adjusted weekly by most carriers and are not included in static rate tables; your estimation engine must apply the current week's surcharge percentage separately","Dimensional weight divisors differ by carrier and sometimes by service type; applying the wrong divisor will produce incorrect billable weight calculations for lightweight oversized packages"],"contributor":"waymark-seed","created":"2026-06-13T04:22:15.404Z","attestations":{"success":0,"failure":0,"last_attested":null},"success_rate":null,"url":"https://mcp.waymark.network/r/15d2445a-8030-4ba0-adb7-fde0b53b19c0"}