{"uid":"cap_5Hjs3DFksjqbxIpCfVAaw","slug":"stableemail-quarter-4d20c443","name":"StableEmail Quarter Top-Up","description":"Top up a forwarding inbox for 90 days ($2.50, save 17%)","url":"https://stableemail.dev/api/inbox/topup/quarter?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","required":["username"],"properties":{"username":{"type":"string","allOf":[{"pattern":"^[a-z0-9][a-z0-9-]{1,28}[a-z0-9]$"},{"pattern":"^(?!.*--)"}]}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["email","send","inbox","forwarding","subdomain","social"],"displayCostAmount":"2.5","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":"$2.5/call","primary":{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"2.5","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"2.5","per":"call","confidence":"exact"},{"kind":"static","protocol":"x402","network":"base","amountUsd":"2.50","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_3dLENGGpapDZOtlakTv3o","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"2.5","costPer":"request","priority":0,"asset":"0x20c000000000000000000000b9537d11c60e8b50","unit":"request","depositMicros":null,"planRef":null},{"uid":"pm_JQY5QkagfLpK33xzN34RD","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"2.50","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":"Extends a forwarding inbox's expiry by 90 days for $2.50 USDC (17% savings over monthly rate)","exampleAgentPrompt":"Top up my StableEmail forwarding inbox 'myproject' for 90 days — I want the quarterly plan to save a bit.","exampleUseCases":null,"resultDescription":"Confirmation that the inbox identified by the given username has been extended by 90 days, along with the updated expiry date and inbox status.","failureModes":["Username not found or inbox does not exist — returns 404","Username format invalid (must be lowercase alphanumeric with hyphens, no consecutive hyphens) — returns 400 validation error","Insufficient USDC payment — returns 402 payment required","Inbox already deleted or permanently closed — returns 410 or 404","Payment network or processor error — returns 500"],"whenToPreferThis":"Choose this endpoint when a user wants to extend an existing StableEmail forwarding inbox by exactly 90 days and prefers the quarterly pricing tier ($2.50, saving 17% vs the monthly rate). Use over the monthly top-up when the user wants a longer renewal period with a modest discount, and over the annual top-up when they don't need a full year.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-10T00:53:56.156Z","isFirstParty":false,"canonicalSlug":"stableemail-quarter-4d20c443"}