{"id":"fc5a951e-8bba-44cc-85ee-6b84acc76770","shortId":"Her2ut","kind":"mpp","title":"Print and mail real letters and postcards via API — pay per order with crypto or Stripe.","tagline":"Print and mail real letters and postcards via API — pay per order with crypto or Stripe.","description":"PostalForm's MPP machine endpoint lets AI agents programmatically create print-and-mail orders for US letters and postcards. You POST a JSON payload containing a PDF reference (upload token, download URL, or base64), sender/recipient addresses (verified via Loqate or manual entry), and mailing options (double-sided, color, mail class, certified). The server returns a 402 MPP challenge with two settlement methods: Tempo (pathUSD on chain 4217) and Stripe (card/link). After settling payment and replaying the request with an Authorization: Payment header, the order is accepted for printing and USPS mailing. A separate validate endpoint lets you pre-check payloads and get a price quote without triggering payment.\n\nBulk mailing campaigns are also supported. Instead of a single recipient, supply a `bulk` object with CSV recipient data and a content mode (text with merge fields, HTML with merge fields, or a single PDF for all rows). The validate response returns the recipient count and content mode. After payment, poll the status endpoint until the order reaches its terminal state; bulk orders include a campaign_url for per-recipient tracking.\n\nPricing ranges from $3.40 to $200.00 per order depending on page count, color, mail class, and add-ons like Certified Mail. The base fee is $3.00, with $0.20/page B&W or $0.40/page color, plus flat-fee tiers for high page counts. Postcards are supported in 4×6, 6×9, and 11×6 sizes with specific PDF bleed templates. The endpoint uses request_id as a strict idempotency key — reuse the same ID and body on payment retries, but generate a fresh UUID for genuinely new orders.","tags":["mail","print","letters","physical","postal"],"capabilities":["print-and-mail","usps-letter","usps-postcard","certified-mail","bulk-mail-merge","address-verification","pdf-upload","idempotent-requests","mpp-payment","stripe-payment","tempo-payment","order-status-polling"],"categories":["mail","print","physical-fulfillment"],"synonyms":["snail mail API","print and mail API","USPS letter API","send letter online","mail PDF API","postal API","direct mail API","bulk mailing API","certified mail API","postcard API"],"warnings":["US addresses only — sender_address_id pattern requires ^US| prefix","Stripe challenge amount is 340 cents ($3.40 USD); Tempo challenge amount is 3400000 base units (pathUSD with 6 decimals = $3.40 USD) — both are discovery-probe minimums, actual prices vary by order"],"endpointUrl":"https://postalform.com/api/machine/mpp/orders","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"postalform.com","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]},"stripe":{"assets":["usd"],"intents":["charge"]}}}},"qualityScore":"0.920","qualityRationale":"Full OpenAPI 3.1 schema with detailed request/response models, multiple examples, clear pricing info, and a live 402 MPP challenge confirming the endpoint is operational. Docs are thorough including bulk, postcard, and idempotency guidance. Minor gap: no actual 200/202 response example was captured from a real paid 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'0.20':244 '0.40':249 '11':270 '200.00':221 '3.00':242 '3.40':219 '4':265 '402':90 '4217':101 '6':266,267,271 '9':268 'USPS letter API' 'accept':120 'add':233 'add-on':232 'address':69 'address-verification' 'agent':40 'ai':39 'also':148 'api':9,25 'author':114 'b':246 'base':239 'base64':67 'bleed':276 'bodi':293 'bulk':144,157,205 'bulk mailing API' 'bulk-mail-merge' 'campaign':146,209 'card/link':104 'certifi':85,236 'certified mail API' 'certified-mail' 'chain':100 'challeng':92 'check':134 'class':84,230 'color':82,228,251 'contain':58 'content':165,190 'count':188,227,260 'creat':42 'crypto':14,30 'csv':160 'data':162 'depend':224 'direct mail API' 'doubl':80 'double-sid':79 'download':64 'endpoint':37,129,197,279 'entri':75 'fee':240,255 'field':170,174 'flat':254 'flat-fe':253 'fresh':300 'generat':298 'genuin':303 'get':137 'header':116 'high':258 'html':171 'id':282,291 'idempot':286 'idempotent-requests' 'includ':207 'instead':150 'json':56 'key':287 'let':38,130 'letter':5,21,50 'like':235 'loqat':72 'machin':36 'mail':3,19,46,77,83,125,145,229,237 'mail PDF API' 'manual':74 'merg':169,173 'method':96 'mode':166,191 'mpp':35,91 'mpp-payment' 'new':304 'object':158 'on':234 'option':78 'order':12,28,47,118,200,206,223,305 'order-status-polling' 'page':226,259 'pathusd':98 'pay':10,26 'payload':57,135 'payment':107,115,143,193,295 'pdf':60,178,275 'pdf-upload' 'per':11,27,213,222 'per-recipi':212 'plus':252 'poll':194 'post':54 'postal API' 'postalform':33 'postcard':7,23,52,261 'postcard API' 'pre':133 'pre-check':132 'price':139,216 'print':1,17,44,122 'print and mail API' 'print-and-mail':43 'programmat':41 'quot':140 'rang':217 'reach':201 'real':4,20 'recipi':154,161,187,214 'refer':61 'replay':109 'request':111,281 'respons':184 'retri':296 'return':88,185 'reus':288 'row':181 'send letter online' 'sender/recipient':68 'separ':127 'server':87 'settl':106 'settlement':95 'side':81 'singl':153,177 'size':272 'snail mail API' 'specif':274 'state':204 'status':196 'strict':285 'stripe':16,32,103 'stripe-payment' 'suppli':155 'support':149,263 'templat':277 'tempo':97 'tempo-payment' 'termin':203 'text':167 'tier':256 'token':63 'track':215 'trigger':142 'two':94 'upload':62 'url':65,210 'us':49 'use':280 'usp':124 'usps-letter' 'usps-postcard' 'uuid':301 'valid':128,183 'verifi':70 'via':8,24,71 'w':247 'without':141","prices":[{"id":"54072077-72a9-4227-8b5d-f2123aa3b5a6","listingId":"fc5a951e-8bba-44cc-85ee-6b84acc76770","amountUsd":null,"unit":"per_call","nativeCurrency":"pathUSD","nativeAmount":null,"chain":"tempo","payTo":null,"paymentMethod":"mpp-tempo","isPrimary":true,"details":{"realm":"postalform.com","intent":"charge","method":"tempo","dynamic":true,"decimals":6,"unit_type":null,"amount_hint":"Varies","raw_payment":{"intent":"charge","method":"tempo","dynamic":true,"currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"amountHint":"Varies","description":"Create and pay for a print-and-mail order"},"asset_contract":"0x20c000000000000000000000b9537d11c60e8b50"},"createdAt":"2026-04-18T20:00:38.848Z"}],"sources":[{"listingId":"fc5a951e-8bba-44cc-85ee-6b84acc76770","source":"mpp_dev","sourceId":"postalform:POST:/api/machine/mpp/orders","sourceUrl":"https://mpp.dev/api/services","isPrimary":true,"firstSeenAt":"2026-04-18T20:00:38.848Z","lastSeenAt":"2026-04-22T15:15:16.423Z"}],"details":{"listingId":"fc5a951e-8bba-44cc-85ee-6b84acc76770","quickStartSnippet":"curl -X POST https://postalform.com/api/machine/mpp/orders/validate \\\n  -H 'Content-Type: application/json' \\\n  -d '{\n    \"request_id\": \"8c1a1b58-2c8f-4f4f-9c46-2c1ac32d7a1b\",\n    \"buyer_name\": \"Agent Owner\",\n    \"buyer_email\": \"owner@example.com\",\n    \"pdf\": { \"upload_token\": \"pfu_123\" },\n    \"sender_name\": \"Sender Example\",\n    \"sender_address_type\": \"Manual\",\n    \"sender_address_manual\": { \"line1\": \"123 Sender St\", \"city\": \"Springfield\", \"state\": \"IL\", \"zip\": \"62701\" },\n    \"recipient_name\": \"Recipient Example\",\n    \"recipient_address_type\": \"Manual\",\n    \"recipient_address_manual\": { \"line1\": \"456 Recipient Ave\", \"city\": \"Springfield\", \"state\": \"IL\", \"zip\": \"62701\" },\n    \"double_sided\": true, \"color\": false, \"mail_class\": \"standard\"\n  }'","exampleRequest":{"pdf":{"upload_token":"pfu_123"},"color":false,"certified":false,"file_name":"letter.pdf","buyer_name":"Agent Owner","mail_class":"standard","request_id":"8c1a1b58-2c8f-4f4f-9c46-2c1ac32d7a1b","buyer_email":"owner@example.com","sender_name":"Sender Example","double_sided":true,"recipient_name":"Recipient Example","sender_address_id":"US|LP|Pz0_Qj4_bGJg|16074807|13_ENG","sender_address_text":"123 Sender St, Springfield, IL 62701","sender_address_type":"Address","recipient_address_id":"US|LP|Pz0_Qj4_bGJg|199825276|99_ENG","recipient_address_text":"456 Recipient Ave, Springfield, IL 62701","recipient_address_type":"Address"},"exampleResponse":{"bulk":null,"quote":{"color":false,"currency":"usd","provider":"postalform","certified":false,"price_usd":3.4,"mail_class":"standard","page_count":1,"double_sided":true,"postcard_size":null,"full_price_usd":3.4,"mailpiece_type":"letter","billable_page_count":1},"status":"validated_new_order","order_id":null,"request_id":"8c1a1b58-2c8f-4f4f-9c46-2c1ac32d7a1b","request_hash":"abc123def456","postcard_guidelines_url":null},"schema":{"path":"/api/machine/mpp/orders","method":"POST","payment":{"intent":"charge","method":"tempo","dynamic":true,"currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"amountHint":"Varies","description":"Create and pay for a print-and-mail order"},"description":"Create and pay for a print-and-mail order"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Pricing starts at $3.00 base fee, $0.20/page B&W, $0.40/page color, with flat-fee tiers for high page counts","source_url":"https://postalform.com/pricing"},{"claim":"Endpoint returns 402 with WWW-Authenticate: Payment challenges for tempo and stripe methods","source_url":"https://postalform.com/api/machine/mpp/orders"},{"claim":"Price range $3.40–$200.00 per order as declared in x-payment-info","source_url":"https://postalform.com"},{"claim":"Supports bulk mailing with CSV content, text/html/pdf content modes, and merge fields","source_url":"https://postalform.com"},{"claim":"Postcard sizes 4x6, 6x9, 11x6 supported with specific PDF bleed templates","source_url":"https://postalform.com"},{"claim":"MCP server available at /mcp for Stripe Agentic Commerce / ChatGPT integration","source_url":"https://postalform.com/docs"},{"claim":"Certified Mail available for First Class only with optional electronic return receipt","source_url":"https://postalform.com/pricing"}],"useCases":["AI agent sends a legal demand letter or dispute packet on behalf of a user","Automated bulk outreach campaign mailing personalized letters to a CSV list","Programmatic certified mail delivery with return receipt tracking","Agent-driven postcard marketing campaigns","Mailing IRS forms or government documents without a printer"],"bestFor":["AI agents that need to bridge digital workflows to physical US mail","Developers building automated document-mailing pipelines","Bulk direct-mail campaigns with merge-field personalization","Sending certified or express USPS mail programmatically"],"notFor":["International mail (addresses must be US-based per schema)","Sub-second latency use cases — physical mail has multi-day fulfillment","Free or zero-cost mailing — every order has a minimum ~$3.40 charge"],"kindDetails":{"docs":{"homepage":"https://postalform.com/agents"},"tags":["mail","print","letters","physical","postal"],"realm":"postalform.com","status":"active","methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]},"stripe":{"assets":["usd"],"intents":["charge"]}},"provider":{"url":"https://postalform.com","name":"PostalForm"},"categories":["web"],"service_id":"postalform","integration":"first-party","service_name":"PostalForm","service_description":"Print and mail real letters and documents via AI agents."},"updatedAt":"2026-04-22T15:15:16.423Z"}}