{"uid":"cap_veovSQh5WVYJC2CfJwgTG","slug":"mailpulse-letter-status-tracking-318be170","name":"MailPulse Letter Status & Tracking","description":"Check the status and tracking of a physical letter previously sent via POST /api/letters. Returns render status, expected delivery date, and (for certified mail) the USPS tracking number.","url":"https://mailpulse.theaslangroupllc.com/api/letters/ltr_1a9b185b1c4ee035","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":{}},"type":{"type":"string","const":"http"},"method":{"enum":["POST","PUT","PATCH"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"errors":{"type":"object","description":"Documented error responses, keyed by HTTP status code","additionalProperties":{"type":"object","required":["description"],"properties":{"example":{"type":"object"},"description":{"type":"string"}}}},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_hG_y9z3JdYfM14MO_-3Rt","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Retrieves the render status, expected delivery date, and USPS tracking number (for certified mail) of a previously sent physical letter.","exampleAgentPrompt":"Can you check the status of the physical letter I sent last week — the letter ID is ltr_1a9b185b1c4ee035 — and let me know if it's been rendered, when it's expected to arrive, and the USPS tracking number if it was sent certified?","exampleUseCases":[{"title":"Confirm certified mail was dispatched","prompt":"I sent a certified letter to my tenant last Tuesday with ID ltr_1a9b185b1c4ee035 — can you check whether it's been rendered and give me the USPS tracking number so I can confirm it's on its way?"},{"title":"Check legal notice delivery estimate","prompt":"I need to know the expected delivery date for the legal notice letter I mailed — letter ID ltr_1a9b185b1c4ee035 — can you pull the status and tell me when it should arrive?"},{"title":"Verify letter processing before follow-up","prompt":"Before I send a follow-up, can you check if the letter ltr_1a9b185b1c4ee035 has finished rendering and been handed off to the postal service yet?"}],"resultDescription":"Returns the letter's current render status (e.g. processing, rendered, mailed), the expected delivery date, and — for certified mail — the USPS tracking number that can be used to monitor delivery on the USPS website.","failureModes":["Letter ID not found — returns error if ltr_... ID doesn't exist or belongs to a different account","Letter not yet processed — status may be pending if called immediately after submission","Invalid letter ID format — returns error for malformed IDs","Payment failure — endpoint requires $0.005 USDC per call via x402 protocol; missing payment returns 402","Network timeout — occasional latency spikes when querying upstream USPS tracking data"],"whenToPreferThis":"Use this endpoint when you have already sent a letter via the MailPulse POST /api/letters endpoint and need to check its current processing status, confirm it has been handed off to USPS, retrieve the expected delivery date, or obtain a USPS tracking number for certified mail. This is specifically for post-send status lookups, not for creating new letters.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:30:19.102Z","isFirstParty":false}