{"uid":"cap_fO92VlXxGEQL-hjd1uI8i","slug":"postal-openverbs-list-supported-countries-f0d3edc1","name":"Postal OpenVerbs - List Supported Countries","description":"List every ISO 3166-1 alpha-2 country code for which a postal-code pattern is available.","url":"https://postal.openverbs.com/v1/countries","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object","properties":{},"additionalProperties":false},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_4i7LK5_6E0Su1XilFCz_k","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns every ISO 3166-1 alpha-2 country code for which a postal-code validation pattern is available.","exampleAgentPrompt":"Which countries are currently supported for postal code validation? I want to know all the ISO country codes you have postal patterns for before I start validating addresses.","exampleUseCases":[{"title":"Pre-flight address validation setup","prompt":"Before I run postal code validation on my customer database, can you pull the list of countries that have supported postal patterns so I know which ones I can validate?"},{"title":"Building a country selector UI","prompt":"I need to build a dropdown that only shows countries where postal code validation is available — can you fetch me the full list of supported ISO country codes?"},{"title":"Checking coverage for international shipping","prompt":"We ship to about 40 countries — can you get the list of all countries with postal code patterns available so I can cross-check which of our destinations are covered?"}],"resultDescription":"An array or list of ISO 3166-1 alpha-2 country codes (e.g. 'US', 'GB', 'DE') representing every country for which the service has a postal-code validation pattern or regex available.","failureModes":["Service unavailable (5xx) if the backend is down","Payment required / x402 error if USDC payment is not provided","Empty or null response if no countries are configured","Network timeout on slow connections"],"whenToPreferThis":"Use this endpoint first, before calling any postal-code validation or normalization endpoints, to discover which countries are supported. It is the discovery/enumeration step in a postal validation workflow — ideal when building dynamic UIs, checking coverage, or filtering a dataset to only validatable countries.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:31:39.058Z","isFirstParty":false}