Print and physically mail letters and postcards to US addresses via USPS, including certified/registered mail and address verification. Paid per call in USDC on Base via the x402 protocol, no signup.
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Scored across 14 tools
Each tool targets a distinct function: updates, document upload (letter/template/postcard), quoting (single, campaign, postcard), payment (x402, MPP, card checkout, detached signature), and status tracking. There is minimal overlap; even the three quote tools (create_mail_quote, create_campaign_quote, create_postcard_quote) are clearly differentiated by recipient type and workflow.
All tool names follow a consistent verb_noun pattern in snake_case (e.g., create_letter, get_campaign_status, submit_paid_mail_job). Verbs are descriptive and nouns clearly indicate the resource or action. There are no mixed conventions or vague names.
14 tools is well-scoped for a mailing and payment server. Each tool serves a distinct step in the workflow (upload, quote, pay, verify, track) without redundancy. The count is neither too low (would miss essential operations) nor too high (would overwhelm).
The tool set covers the core lifecycle: document preparation, quoting, multiple payment rails, address verification, and status tracking. Minor gaps exist, such as no explicit tool to cancel a job or list previously created documents, but these are not critical for typical use and can be worked around.
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
check_postagent_updatescreate_mail_quote2 fields changedInput schema / properties / options / properties / extraService / descriptionPrevious value: -"USPS proof-of-mailing add-on that affects the locked quote price: certified mail, certified mail with electronic return receipt (proof of delivery), or registered mail (maximum chain-of-custody). Not available at the economy service level. Wins over the deprecated `certified` boolean."New value: +"USPS proof-of-mailing add-on that affects the locked quote price: certified mail, certified mail with electronic return receipt (proof of delivery), or registered mail (maximum chain-of-custody). Wins over the deprecated `certified` boolean. Soft preference: if no available provider supports the requested extra for this destination, it is dropped and an `extra_service_unavailable` warning is returned on the quote's `fulfillment.warnings`. Always inspect that list before paying so you do not silently accept mail without certification/registration."Input schema / properties / options / properties / serviceLevel / descriptionPrevious value: -"Delivery service level. `economy` for cheapest non-time-critical mail, `standard` (default) for first-class equivalent, `express` for expedited where available. Replaces `mailClass`."New value: +"Delivery service level. `economy` for cheapest non-time-critical mail, `standard` (default) for first-class equivalent, `express` for expedited where available. Replaces `mailClass`. Soft preference: if no fulfillment provider supports the requested level for this destination, the closest available level is selected and a `service_level_downgraded` warning is returned in the quote's `fulfillment.warnings` — review it before paying."create_campaign_quote1 field changedInput schema / properties / options / properties / serviceLevel / descriptionPrevious value: -"Provider-neutral delivery service level (replaces mailClass)."New value: +"Delivery service level (replaces mailClass)."create_mail_quote3 fields changedInput schema / properties / options / properties / color / descriptionPrevious value: -"Print in color (surcharge applies)"New value: +"Print in color; affects the locked quote price."Input schema / properties / options / properties / extraService / descriptionPrevious value: -"USPS proof-of-mailing add-on (surcharge applies): certified mail, certified mail with electronic return receipt (proof of delivery), or registered mail (maximum chain-of-custody). Not available at the economy service level. Wins over the deprecated `certified` boolean."New value: +"USPS proof-of-mailing add-on that affects the locked quote price: certified mail, certified mail with electronic return receipt (proof of delivery), or registered mail (maximum chain-of-custody). Not available at the economy service level. Wins over the deprecated `certified` boolean."Input schema / properties / options / properties / serviceLevel / descriptionPrevious value: -"Provider-neutral delivery service level. `economy` for cheapest non-time-critical mail, `standard` (default) for first-class equivalent, `express` for expedited where available. Replaces `mailClass`."New value: +"Delivery service level. `economy` for cheapest non-time-critical mail, `standard` (default) for first-class equivalent, `express` for expedited where available. Replaces `mailClass`."create_postcard_quote1 field changedInput schema / properties / options / properties / serviceLevel / descriptionPrevious value: -"Provider-neutral delivery service level (replaces mailClass)."New value: +"Delivery service level (replaces mailClass)."create_campaign_quote4 fields changedInput schema / properties / options / properties / mailClass / defaultRemoved value: -"usps_first_class"Input schema / properties / options / properties / mailClass / descriptionAdded value: +"Deprecated USPS mail class alias. Prefer serviceLevel."Input schema / properties / options / properties / serviceLevelAdded value: +{
+ "description": "Provider-neutral delivery service level (replaces mailClass).",
+ "enum": [
+ "economy",
+ "standard",
+ "express"
+ ],
+ "type": "string"
+}Input schema / properties / options / properties / useType / descriptionPrevious value: -"Accurate USPS use type; bulk sends are typically marketing."New value: +"Accurate use type; bulk sends are typically marketing."create_mail_quote4 fields changedInput schema / properties / options / properties / extraService / descriptionPrevious value: -"USPS proof-of-mailing add-on (surcharge applies): certified mail, certified mail with electronic return receipt (proof of delivery), or registered mail (maximum chain-of-custody). Requires mailClass usps_first_class. Wins over the deprecated `certified` boolean."New value: +"USPS proof-of-mailing add-on (surcharge applies): certified mail, certified mail with electronic return receipt (proof of delivery), or registered mail (maximum chain-of-custody). Not available at the economy service level. Wins over the deprecated `certified` boolean."Input schema / properties / options / properties / mailClass / defaultRemoved value: -"usps_first_class"Input schema / properties / options / properties / mailClass / descriptionPrevious value: -"USPS mail class"New value: +"Deprecated USPS mail class alias for back-compat. Prefer `serviceLevel`: usps_first_class maps to standard, usps_standard maps to economy."Input schema / properties / options / properties / serviceLevelAdded value: +{
+ "description": "Provider-neutral delivery service level. `economy` for cheapest non-time-critical mail, `standard` (default) for first-class equivalent, `express` for expedited where available. Replaces `mailClass`.",
+ "enum": [
+ "economy",
+ "standard",
+ "express"
+ ],
+ "type": "string"
+}create_postcard_quote4 fields changedInput schema / properties / backDocumentId / descriptionPrevious value: -"documentId of the BACK artwork (kind postcard_art). Lob prints the recipient address block over part of the back."New value: +"documentId of the BACK artwork (kind postcard_art). The print partner prints the recipient address block over part of the back."Input schema / properties / options / properties / mailClass / defaultRemoved value: -"usps_first_class"Input schema / properties / options / properties / mailClass / descriptionAdded value: +"Deprecated USPS mail class alias. Prefer serviceLevel."Input schema / properties / options / properties / serviceLevelAdded value: +{
+ "description": "Provider-neutral delivery service level (replaces mailClass).",
+ "enum": [
+ "economy",
+ "standard",
+ "express"
+ ],
+ "type": "string"
+}create_campaign_quotecreate_card_checkoutcreate_lettercreate_mail_quotecreate_postcard_artcreate_postcard_quotecreate_templateget_campaign_statusget_mail_job_statuspay_mail_with_shared_payment_tokenprepare_mail_paymentsubmit_paid_mail_jobverify_address
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