{"uid":"cap_08eHdR5tMIAoLdnj89C2n","slug":"postagent-address-verification-api-00f42b06","name":"PostAgent Address Verification API","description":"Verify a postal address for deliverability, paid in USDC. POST a JSON body { \"address\": { \"line1\", \"city\", \"state\", \"zip\", \"country?\" } } with an X-PAYMENT header to get CASS-standardized deliverability (US) or international verification (2-letter non-US country code). Flat price per call; the same request without a payment header returns the 402 challenge.","url":"https://postagent-api.interpretai.tech/v1/verify","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{"address":{"type":"object","description":"Postal address to verify. US: line1 + (city+state or zip). International: line1 + country (2-letter ISO, non-US) + any known components."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_nOOkUmlij0ZfZeXukEIoo","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies a postal address for deliverability using CASS standardization (US) or international validation, paid per-call in USDC via x402","exampleAgentPrompt":"Can you verify whether '123 Main Street, Springfield, IL 62701' is a real, deliverable US address before I send out the mailing?","exampleUseCases":[{"title":"Validate customer address before mailing","prompt":"I'm about to send promotional postcards to our customer list. Can you check each address to make sure they're actually deliverable before we commit to printing them?"},{"title":"Standardize international shipping addresses","prompt":"We've got a bunch of orders from Canada and UK customers. Can you validate and standardize all their shipping addresses so we know they'll actually receive their packages?"},{"title":"Confirm ZIP code and city match","prompt":"I just received a new customer signup with address '456 Oak Ave, Denver, CO 80202'. Can you verify that ZIP code is correct for Denver and the address will actually receive mail?"}],"resultDescription":"Returns a CASS-standardized deliverability result for US addresses (line1, city, state, ZIP corrected and confirmed deliverable or not), or an international verification result for non-US addresses identified by a 2-letter ISO country code. On success, the agent receives structured address validation data. Without a valid payment header, the endpoint returns a 402 payment challenge with pricing details.","failureModes":["Missing or invalid X-PAYMENT header returns 402 with payment challenge","Malformed address object (missing required fields like line1) returns 400 bad request","Unsupported country code or unrecognized address format returns validation error","Non-deliverable address returns a response indicating undeliverable status rather than an error","Network timeout or service unavailability returns 5xx error"],"whenToPreferThis":"Choose this endpoint when you need per-call, pay-as-you-go postal address verification with CASS standardization for US addresses or international validation for non-US addresses, especially in agentic workflows that already handle x402 micropayments in USDC. Ideal for validating addresses before triggering physical mail delivery (e.g. via the sibling print-and-mail endpoint on the same platform). Prefer this over bulk address validation APIs when individual address checks are needed on-demand without a subscription.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:33:53.965Z","isFirstParty":false}