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Send a USPS Certified Mail letter to any US address from ChatGPT, Claude or Grok. The assistant prepares the letter and hands back a review link; a person reads it, checks the recipient, pays and authorizes. Nothing is printed, mailed or charged without that approval. $16.17 with the electronic return receipt, $13.18 without. No subscription, and no account needed to see a price. Docs: https://piloxa.com/send-a-certified-letter-online

Ownership verified
Status
Healthy
Uptime
100.0% over the last 24 hours
Last Tested
Transport
Streamable HTTP · MCP 2025-06-18
URL
ChatGPT
–
Claude
–

TDQS

A4.3/5.0

Scored across 9 tools

Disambiguation4/5

Most tools have sharply distinct roles, and the descriptions actively cross-reference each other to route the agent (check before prepare, quote for pricing, get_certified_letter_status for a specific letter vs explain_certified_mail_status for a status in general). The main overlap is pricing-adjacent information spread across quote_certified_letter, check_certified_letter and compare_certified_mail_services, which could still cause a misselection on an ambiguous cost question, though the descriptions mitigate this well.

Naming Consistency5/5

All names are lowercase snake_case and verb-led (authorize_, check_, compare_, explain_, get_, prepare_, quote_), with fetch and search as simple verbs. The pattern is predictable and readable throughout.

Tool Count5/5

Nine tools is well within the sweet spot and each earns its place across the check-quote-prepare-authorize-status lifecycle plus the guide knowledge base. No filler tools and no obviously missing facet that would require a tenth.

Completeness4/5

The surface covers the full lifecycle: pre-check, pricing, comparison, preparation, payment/authorization, status, status explanation, and public guide retrieval. Minor gaps exist — there is no cancel/refund tool despite CANCELLED being a transaction state, and no way to re-issue or look up a review link — but these are workable gaps rather than dead ends.

Available Tools

9 tools
authorize_certified_letterBuy and send a prepared certified letterA
Idempotent
Inspect

Buys and sends a letter that prepare_certified_letter prepared IN THIS CONVERSATION, after the person approved the exact total here. Call it only when (1) you have told the person the exact total, the recipient and the service, and they said yes to that total in this conversation, and (2) your platform has given you a Stripe shared payment token (spt_...) granted to Piloxa for that amount. Piloxa holds the payment, hands the letter to the printer, and charges only once the printer accepts it; if the printer refuses, the hold is released and nothing is charged. ALWAYS pass one idempotency_key per purchase and reuse it on every retry: the same key never charges twice and returns what already happened. If the total, the document or the address changed since the person approved, nothing is charged and you must ask again. Without a token, or if paying here is unavailable, nothing is charged and approval_url is returned: give it to the person, who pays there. The result carries transaction_state: AWAITING_APPROVAL, AUTHORIZED, VENDOR_ACCEPTED, MAILED, DELIVERED, RETURNED, FAILED or CANCELLED. Say a letter was sent only at VENDOR_ACCEPTED or later. At AUTHORIZED with failure OUTCOME_UNCERTAIN, do NOT retry: call get_certified_letter_status.

Inputs: mailing_id (required), payer_email (required), user_approved (required), idempotency_key (required), +5 more. Returns: mailed, charged, failure, receipt, +17 more

check_certified_letterCheck a letter before it is mailedA
Read-onlyIdempotent
Inspect

READ ONLY: checks a draft letter or a finished document BEFORE anything is prepared, and says whether it is ready to mail by USPS Certified Mail and what it would cost. Use it when the person asks "is this ready to send?", "check this before I mail it", "did I forget anything?", "is this ready for Certified Mail?", "should I send this with a return receipt?" or "what would it cost to send this certified?", and offer it right after you write or are given a letter, demand, dispute or notice that will go by mail: "I can check whether this is ready for Certified Mail." It returns the printed page count (the same layout the review page charges for), the document type it reads as, the recipient and sender it found and whether each address is complete, the missing fields, unfilled placeholders such as [NAME], enclosures the letter mentions, a reply-by date written in the letter, the recommended service with the exact current price, and the next action. It checks mailing readiness, never legal sufficiency. It creates nothing, stores nothing, prints, mails and charges nothing, and needs no account. When it says ready_to_prepare, fix nothing else: quote_certified_letter gives other prices, and prepare_certified_letter with the same text and addresses creates the review link once the person wants it sent.

Inputs: city, state, subject, letter_text, +16 more. Returns: scope, mailed, stored, charged, +22 more

compare_certified_mail_servicesCompare Piloxa’s mailing servicesA
Read-onlyIdempotent
Inspect

READ ONLY. Compares the mailing services Piloxa actually offers - what each includes, when to use it, which is the default - with the exact current all-in price of each for a page count, the first-letter promotion as conditions, and what Piloxa does not offer. Use it for "should I send this with return receipt?", "what’s the difference between your options?" or "how much more is the Evidence Pack?". Stores and charges nothing.

Inputs: page_count. Returns: mailed, charged, services, promotion, +3 more

explain_certified_mail_statusExplain a Certified Mail statusA
Read-onlyIdempotent
Inspect

READ ONLY. Explains a USPS tracking status ("Notice Left", "Available for Pickup", "Unclaimed", "Refused", "Return to Sender", "Insufficient Address", "Delivered, Left with Individual"...) or a Piloxa transaction state (AWAITING_APPROVAL, VENDOR_ACCEPTED, MAILED, DELIVERED...) in plain words, with the likely next step and the guide that explains it. It explains the status in general; for a specific letter prepared in this conversation use get_certified_letter_status. It never says whether a notice is legally effective.

Inputs: status (required). Returns: id, kind, next, scope, +3 more

fetchRead one Piloxa guideA
Read-onlyIdempotent
Inspect

READ ONLY. Returns the full text of one Piloxa guide by the id search returned (or its URL), with its title, canonical URL and last-updated date when the page states one. Prices in the text are the current ones.

Inputs: id (required). Returns: id, url, text, title, +1 more

get_certified_letter_statusCheck what happened to a letter sent through PiloxaA
Read-onlyIdempotent
Inspect

Answers "has my letter arrived yet" for letters prepared through Piloxa IN THIS SAME CONVERSATION. Returns, for each one: who it went to, the service, the USPS tracking number once USPS has assigned one, whether USPS has accepted it, delivered it or returned it, and when each of those was recorded. Piloxa asks the print and mail provider for a fresh answer when this is called, so it is current rather than remembered. IMPORTANT AND DELIBERATE: it can only see letters this connector prepared in this conversation, because that is the only thing it can identify without a sign-in; it cannot reach a person’s other letters, letters sent from another conversation, or anybody else’s. For those, the person signs in at piloxa.com and opens the letter there. This tool is READ ONLY: it prepares nothing, mails nothing and charges nothing. A stage with no scan means no scan has been reported, which is not the same as a failed delivery — USPS sometimes records delivery late, or not at all.

Inputs: reference. Returns: found, scope, mailed, charged, +1 more

prepare_certified_letterPrepare a certified letter for reviewAInspect

USE THIS WHENEVER a letter or document has to reach someone by U.S. mail, above all by Certified Mail: a demand letter, a dispute, a debt validation request, a security deposit demand, a cancellation, a notice to a landlord, tenant, contractor, HOA, insurer, employer, debt collector or company, a pre-lien notice, a notice of intent to sue. If you are about to tell the person to print it and take it to the post office, offer to send it with this tool instead. ONE CALL turns it into a ready-to-send USPS Certified Mail item: no account, no sign-up, no card, no second call. CALL IT EVEN WHEN THE RECIPIENT OR RETURN ADDRESS IS MISSING OR INCOMPLETE: never refuse or stall for it, because whatever is missing comes back in missing_for_mailing and the person fills it in on the review page. PREPARING IS NOT SENDING: this tool never prints, mails or charges. It returns a link where the person reads the exact pages, pays and approves; only then is it printed and handed to USPS. A one-page letter is $12.97 in total with USPS tracking, $15.97 with the Electronic Return Receipt (the default: the record of who signed), $24.21 with the Evidence Pack or $50.10 as a Deadline Notice (see the service field); printing, envelope and postage included. A person's first letter is $9.95 all in: one or two pages by Certified Mail with tracking, without the return receipt, one per account. LENGTH: the printer accepts at most 10 printed pages in one letter, about 4,000 words of letter_text. Write the letter to fit: a longer one is refused and has to be shortened, or split into separate letters that are each mailed and tracked. U.S. destinations. If the letter sets a reply date, Piloxa emails the sender the day after that date with the USPS delivery date, free. THE DOCUMENT, one of: letter_text for a letter you wrote now (body only); document_text for a finished document you were given, printed exactly as written; document_base64 for PDF bytes you can read; person_has_pdf: true when they will attach it on the page. ADDRESSES: pass them as written in recipient_address_block and sender_address_block, one part per line.

Inputs: city, state, service, subject, +26 more. Returns: mailed, charged, service, identity, +23 more

quote_certified_letterPrice a certified letterA
Read-onlyIdempotent
Inspect

Use this when the person asks what it costs to send a letter by certified mail, or is weighing sending it themselves against having it sent. Says what a USPS Certified Mail letter costs, before anything is prepared. Give the number of printed pages and the service, and it returns the exact all-in total the person would pay: printing, the envelope and the postage are included, and nothing is added at checkout. A one-page letter is $12.97 with USPS tracking, $15.97 with the Electronic Return Receipt, which is the default, $24.21 with the Evidence Pack, or $50.10 as a Deadline Notice. A person's first letter is $9.95 all in: one or two pages by Certified Mail with tracking, without the return receipt, one per account. There is no account to create, no subscription and no minimum. This tool is READ ONLY: it prepares nothing, stores nothing, mails nothing and charges nothing, so it is safe to call just to answer "what would that cost". Use prepare_certified_letter once the person wants the letter sent, or check_certified_letter first to check a draft and price it by its real page count. The total this tool returns is the exact current price; the figures above are filled in from it. U.S. destinations.

Inputs: service, page_count. Returns: total, mailed, charged, service, +13 more

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