{"uid":"cap_rhI-pSGtJVI1pn12G9qtE","slug":"agmail-inbox-4-hour-renewal-mpp-50b9c0e9","name":"agmail Inbox 4-Hour Renewal (MPP)","description":"Receive-only email inboxes for AI agents, by the hour. Pay in stablecoins with x402 or MPP; one call returns the code or the link.","url":"https://agmail.shveik.dev/v1/mpp/inbox-4h-renew?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"secret":{"type":"string"},"inbox_id":{"type":"string","pattern":"^ib_[0-9a-f]{12}$"}}},"responseSchema":{"type":"json","example":{"next":"The extension is applied once the payment has settled (a minute or so); GET /v1/…","plan":"4h","status":"queued","inbox_id":"ib_0123456789ab"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_T_g3jYXkTiaEtwV_UHMm-","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Renews an existing agmail receive-only email inbox by 4 hours, paying via the Micropayment Protocol (MPP) in stablecoins.","exampleAgentPrompt":"My agmail inbox ib_0123456789ab is about to expire — renew it for another 4 hours using MPP with my secret so my agent can keep receiving emails.","exampleUseCases":[{"title":"Support inbox for an agent fleet","prompt":"My agent fleet's shared agmail inbox ib_aabbccddeeff is expiring in a few minutes — use MPP to renew it for 4 more hours so the agents can keep receiving support confirmations."},{"title":"Automated signup verification pipeline","prompt":"Keep inbox ib_112233445566 alive for another 4 hours via MPP so my signup-verification agent can keep catching verification emails — use secret 'sk_abc123'."},{"title":"Long-running task monitoring inbox","prompt":"My autonomous research agent is mid-task and its agmail inbox ib_99aabb001122 is about to expire; renew it 4 hours using the micropayment protocol so it doesn't miss any incoming results."}],"resultDescription":"Returns a JSON object with the inbox_id, the plan ('4h'), a status of 'queued' indicating the extension will be applied after payment settles (about a minute), and a 'next' field with instructions on how to poll for confirmation.","failureModes":["Invalid or mismatched inbox_id and secret — returns an authentication or not-found error","Inbox does not exist or has already permanently expired — returns a 404 or invalid-state error","Payment settlement failure or insufficient stablecoin balance — renewal remains queued but may not apply","Malformed inbox_id (not matching pattern ^ib_[0-9a-f]{12}$) — returns a validation error","Network or service timeout — payment may have been processed but status unknown, requiring a GET poll"],"whenToPreferThis":"Use this endpoint specifically when you need to extend an existing agmail inbox by exactly 4 hours via the Micropayment Protocol (MPP) and you already have the inbox_id and secret. Prefer this over other agmail sibling endpoints when your agent is mid-task and the inbox is about to expire and you want to pay programmatically in USDC stablecoins without manual intervention. If you need a different duration or are creating a new inbox rather than renewing, use the appropriate sibling endpoint instead.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-10T12:36:04.934Z","isFirstParty":false,"canonicalSlug":"agmail-inbox-4-hour-renewal-mpp-50b9c0e9"}