{"uid":"cap_ghQQq4YlSNq4turXi_vKi","slug":"stableemail-buy-ac5a5e51","name":"StableEmail Buy Custom Email Subdomain","description":"Purchase a custom email subdomain on stableemail.dev ($5)","url":"https://stableemail.dev/api/subdomain/buy?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","required":["subdomain"],"properties":{"subdomain":{"type":"string","allOf":[{"pattern":"^[a-z0-9][a-z0-9-]{1,28}[a-z0-9]$"},{"pattern":"^(?!.*--)"}]}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["email","send","inbox","forwarding","subdomain","social"],"displayCostAmount":"5","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"1.00","reviews":0,"stars":null,"state":"rated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$5/call","primary":{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"5","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"5","per":"call","confidence":"exact"},{"kind":"static","protocol":"x402","network":"base","amountUsd":"5","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_c-5dWDmRbpM_Vq31fa7iL","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"5","costPer":"request","priority":0,"asset":"0x20c000000000000000000000b9537d11c60e8b50","unit":"request","depositMicros":null,"planRef":null},{"uid":"pm_46poELMDrPYdczEzRk6tv","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"5","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":"StableEmail","brandSlug":"stableemail","brandBaseUrl":"https://stableemail.dev","brandDocsUrl":"https://stableemail.dev","whatItDoes":"Purchase a custom email subdomain on stableemail.dev for $5 USDC, enabling branded email addresses like yourname.stableemail.dev","exampleAgentPrompt":"Can you register the subdomain 'myproject' on StableEmail so I can use it for custom email addresses — it's stableemail.dev and costs $5?","exampleUseCases":null,"resultDescription":"Returns confirmation that the custom email subdomain has been purchased and registered on stableemail.dev, enabling the use of that subdomain for email forwarding and receiving without needing an account.","failureModes":["Subdomain already taken — returns conflict error","Invalid subdomain format — must be lowercase alphanumeric with hyphens, 3-30 chars, no double hyphens, not starting or ending with hyphen","Insufficient USDC balance — payment of $5 USDC fails","Subdomain contains reserved or blocked words — rejected","Network timeout during payment processing"],"whenToPreferThis":"Use this endpoint when you need a persistent, branded custom email subdomain (e.g. myapp.stableemail.dev) for routing or receiving email, especially when you want no-account, pay-once setup. Prefer over the inbox Buy endpoint when you need a shared namespace for multiple inboxes under one subdomain rather than a single inbox address.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":1,"lastUsedAt":"2026-06-12T19:07:11.842Z","lastSuccessfullyRanAt":"2026-06-12T19:07:11.842Z","lastHealthCheckAt":"2026-10-09T18:48:34.414Z","isFirstParty":false,"canonicalSlug":"stableemail-buy-ac5a5e51"}