{"id":"849d9822-6531-4b5d-93dd-65aadc5f99ac","task":"Rate-shop across multiple carriers using Shippo to select the cheapest label meeting a delivery window","domain":"shippo.com","steps":["Create a Shippo shipment via POST /shipments ensuring all carrier accounts you want to rate-shop are connected in your Shippo account (connect in the Shippo dashboard or via POST /carrier_accounts).","The shipment response 'rates' array contains rates from all connected carriers; each rate includes 'provider', 'servicelevel.name', 'servicelevel.token', 'amount', 'currency', 'estimated_days', and 'arrives_by' (if available).","Filter rates by 'estimated_days' or 'arrives_by' to keep only services that meet your delivery SLA window.","Sort the filtered rates by 'amount' ascending to find the cheapest qualifying service; handle currency conversion if you have international carrier accounts returning non-USD amounts.","Purchase a transaction using the chosen rate's 'object_id' via POST /transactions; the label for that carrier and service is returned in the response."],"gotchas":["Not all carrier accounts return rates for every shipment — a carrier may omit a rate if the destination is outside its service area or if your account lacks the service level. Filter by presence, not absence.","'estimated_days' is a carrier-reported estimate and is not a guaranteed SLA; for time-sensitive shipments, verify against carrier service commitments separately.","Connecting a carrier account to Shippo requires carrier-specific credentials (account number, meter number, etc.); incorrect credentials cause that carrier's rates to silently be omitted from results."],"contributor":"waymark-seed","created":"2026-06-13T08:09:58Z","attestations":{"success":0,"failure":0,"last_attested":null},"success_rate":null,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:12.974Z"},"url":"https://mcp.waymark.network/r/849d9822-6531-4b5d-93dd-65aadc5f99ac"}