{"info":{"contact":{"email":"ywbpmf@gmail.com","name":"OpenTax Platform Support","url":"https://opentaxus.com"},"description":"High-speed real-time US sales tax rate lookup, breakdown calculator, and geographic spatial intelligence API.","title":"OpenTax REST API","version":"1.0.0"},"openapi":"3.0.3","paths":{"/api/v1/tax/calculate":{"get":{"operationId":"calculateSalesTax","parameters":[{"description":"5-digit US ZIP code","in":"query","name":"zip","required":true,"schema":{"type":"string"}},{"description":"Purchase transaction amount in USD","in":"query","name":"amount","required":true,"schema":{"type":"number"}}],"responses":{"200":{"description":"Computed itemized sales tax breakdown"}},"summary":"Calculate exact sales tax amount and total price for a purchase"}},"/api/v1/tax/lookup":{"get":{"operationId":"lookupTaxByZip","parameters":[{"description":"5-digit US ZIP Code (e.g. 90001, 10001, 75001)","in":"query","name":"zip","required":true,"schema":{"type":"string"}},{"description":"Language code (en, zh-hans, es, ja, ko, de, fr, etc.)","in":"query","name":"lang","required":false,"schema":{"default":"en","type":"string"}}],"responses":{"200":{"content":{"application/json":{"schema":{"type":"object"}}},"description":"Successful tax lookup response"}},"summary":"Lookup sales tax breakdown by 5-digit ZIP code"}},"/api/v1/tax/nearest":{"get":{"operationId":"lookupNearestTax","parameters":[{"description":"Latitude coordinate (-90 to +90)","in":"query","name":"lat","required":true,"schema":{"type":"number"}},{"description":"Longitude coordinate (-180 to +180)","in":"query","name":"lng","required":true,"schema":{"type":"number"}}],"responses":{"200":{"description":"Nearest matching ZIP code and tax rate"}},"summary":"Lookup sales tax rate for GPS coordinates (Latitude/Longitude)"}}},"servers":[{"description":"OpenTax API Gateway","url":"https://opentaxus.com"}]}