Waymark / Routes / smarty.com Use SmartyStreets (Smarty) US Street Address API to validate and standardize addresses and extract ZIP+4 before carrier label purchase
domain: smarty.com · 6 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed
Verified steps Sign up for a Smarty account and obtain an auth-id and auth-token from the dashboard; free tier allows a limited number of lookups per month Send a GET or POST request to /street-address with street, city, state, zipcode, and candidates=1 as query or JSON body parameters On a successful match, read the components object for parsed street number, street name, city, state, zip code, and plus4_code fields Read dpv_match_code in the analysis object: Y = confirmed deliverable, S = secondary info missing, D = default match, N = no match Reject or flag addresses where dpv_match_code is N or where dpv_vacant is Y (vacant address) before purchasing a label Use the standardized output address to populate the carrier API shipment request to reduce address correction surcharges Known gotchas Smarty returns an empty array for addresses it cannot match; your code must handle a zero-length response rather than a structured error object The candidates parameter limits how many address variations are returned; set it to 1 for strict validation or higher to offer correction suggestions International address validation requires a separate API endpoint and subscription plan; the US Street Address API only covers domestic US addresses
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