{"id":"1bf14603-9d66-4571-b9a1-f653616dd48f","shortId":"WBKTKC","kind":"mpp","title":"Get upsell offers (cabin upgrades, branded fares) for an Amadeus flight offer at $0.03/request via MPP micropayment.","tagline":"Get upsell offers (cabin upgrades, branded fares) for an Amadeus flight offer at $0.03/request via MPP micropayment.","description":"The `/api/flights/upsell` endpoint on StableTravel returns upsell offers for a given flight offer obtained from a prior search. It wraps the Amadeus Flight Offers Upselling API behind a pay-per-request micropayment wall — no API keys, no subscriptions. You POST a JSON body containing `{ \"data\": { \"type\": \"flight-offers-upselling\", \"flightOffers\": [ <flight-offer-object> ] } }` and receive back an array of alternative offers with higher cabin classes, branded fare bundles, or additional services.\n\nThis endpoint is part of the broader StableTravel platform, which exposes 60+ travel endpoints covering Amadeus GDS flights (search, price, book, seatmap, availability, status), hotels, activities, airport transfers, reference data, Google Flights price comparison, and FlightAware real-time/historical flight tracking. All endpoints are paid per-request via the MPP (method: tempo) or x402 protocol using USDC on Base, Solana, or Tempo. The upsell endpoint costs $0.03 per call (listed as 0.032400 USD in the OpenAPI spec). No OAuth, no API keys — the micropayment itself serves as authentication.\n\nTypical workflow: search flights via `/api/flights/search`, take a flight offer from the results, then POST it to `/api/flights/upsell` to discover premium alternatives. The returned offers can then be confirmed via `/api/flights/price` and booked via `/api/flights/book`.","tags":["amadeus","flightaware","flights","hotels","activities","transfers","travel"],"capabilities":["flight-upsell","branded-fares","cabin-upgrade","amadeus-gds","pay-per-request","micropayment","mpp-tempo","x402","no-auth"],"categories":["travel","flights"],"synonyms":["flight upsell","cabin upgrade API","branded fare offers","Amadeus upselling","flight offer upgrade","premium cabin search","fare upsell","flight class upgrade"],"warnings":["Probe returned 405 on HEAD and GET because this is a POST-only endpoint; liveness inferred from root 200 and OpenAPI availability, not from a direct 402 challenge","Example request/response JSON is illustrative based on Amadeus upselling conventions; actual GDS response structure may vary","The flight-offer object passed to upsell must come from a prior /api/flights/search call — it cannot be constructed from scratch"],"endpointUrl":"https://stabletravel.dev/api/flights/upsell","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"stabletravel.dev","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.820","qualityRationale":"Full OpenAPI 3.1 schema with request/response types, clear pricing ($0.032400 USD), documented request body format, and comprehensive guidance text. The probe did not capture a live 402 challenge on this POST-only endpoint (HEAD/GET returned 405, which is expected), so liveness is inferred from the broader platform being live (root returned 200) and the OpenAPI spec being 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'/api/flights/price':227 '/api/flights/search':202 '/api/flights/upsell':38,214 '/historical':146 '/request':15,33 '0.03':14,32,175 '0.032400':180 '60':118 'Amadeus upselling' 'activ':132 'addit':105 'airport':133 'altern':95,218 'amadeus':10,28,58,122 'amadeus-gds' 'api':62,72,189 'array':93 'authent':196 'avail':129 'back':91 'base':167 'behind':63 'bodi':80 'book':127,229 'brand':6,24,101 'branded fare offers' 'branded-fares' 'broader':113 'bundl':103 'cabin':4,22,99 'cabin upgrade API' 'cabin-upgrade' 'call':177 'class':100 'comparison':140 'confirm':225 'contain':81 'cost':174 'cover':121 'data':82,136 'discov':216 'endpoint':39,108,120,150,173 'expos':117 'fare':7,25,102 'fare upsell' 'flight':11,29,48,59,85,124,138,147,200,205 'flight class upgrade' 'flight offer upgrade' 'flight upsell' 'flight-offers-upsel':84 'flight-upsell' 'flightawar':142 'flightoff':88 'gds':123 'get':1,19 'given':47 'googl':137 'higher':98 'hotel':131 'json':79 'key':73,190 'list':178 'method':159 'micropay':18,36,69,192 'micropayment' 'mpp':17,35,158 'mpp-tempo' 'no-auth' 'oauth':187 'obtain':50 'offer':3,12,21,30,44,49,60,86,96,206,221 'openapi':184 'paid':152 'part':110 'pay':66 'pay-per-request':65 'per':67,154,176 'per-request':153 'platform':115 'post':77,211 'premium':217 'premium cabin search' 'price':126,139 'prior':53 'protocol':163 'real':144 'real-tim':143 'receiv':90 'refer':135 'request':68,155 'result':209 'return':42,220 'search':54,125,199 'seatmap':128 'serv':194 'servic':106 'solana':168 'spec':185 'stabletravel':41,114 'status':130 'subscript':75 'take':203 'tempo':160,170 'time':145 'track':148 'transfer':134 'travel':119 'type':83 'typic':197 'upgrad':5,23 'upsel':2,20,43,61,87,172 'usd':181 'usdc':165 'use':164 'via':16,34,156,201,226,230 'wall':70 'workflow':198 'wrap':56 'x402':162","prices":[{"id":"b21a45f3-e0ef-4449-8925-6b6f1e8c0195","listingId":"1bf14603-9d66-4571-b9a1-f653616dd48f","amountUsd":"0.0324","unit":"per_call","nativeCurrency":"pathUSD","nativeAmount":"32400","chain":"tempo","payTo":null,"paymentMethod":"mpp-tempo","isPrimary":true,"details":{"realm":"stabletravel.dev","intent":"charge","method":"tempo","dynamic":false,"decimals":6,"unit_type":null,"amount_hint":null,"raw_payment":{"amount":"32400","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Get upsell offers for a flight"},"asset_contract":"0x20c000000000000000000000b9537d11c60e8b50"},"createdAt":"2026-04-18T19:59:38.010Z"}],"sources":[{"listingId":"1bf14603-9d66-4571-b9a1-f653616dd48f","source":"mpp_dev","sourceId":"stabletravel:POST:/api/flights/upsell","sourceUrl":"https://mpp.dev/api/services","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:38.010Z","lastSeenAt":"2026-04-22T07:15:15.364Z"}],"details":{"listingId":"1bf14603-9d66-4571-b9a1-f653616dd48f","quickStartSnippet":"# 1. Search flights first, then upsell a result\nnpx agentcash fetch -X POST -H \"Content-Type: application/json\" \\\n  -d '{\"data\":{\"type\":\"flight-offers-upselling\",\"flightOffers\":[<flight-offer-from-search>]}}' \\\n  \"https://stabletravel.dev/api/flights/upsell\"","exampleRequest":{"data":{"type":"flight-offers-upselling","flightOffers":[{"id":"1","type":"flight-offer","price":{"total":"250.00","currency":"USD"},"source":"GDS","itineraries":[{"segments":[{"number":"1","arrival":{"at":"2025-07-15T11:30:00","iataCode":"LAX"},"aircraft":{"code":"77W"},"duration":"PT5H30M","departure":{"at":"2025-07-15T08:00:00","iataCode":"JFK"},"carrierCode":"AA"}]}],"travelerPricings":[{"fareOption":"STANDARD","travelerId":"1","travelerType":"ADULT"}]}]}},"exampleResponse":{"data":[{"id":"2","type":"flight-offer","price":{"total":"450.00","currency":"USD"},"source":"GDS","itineraries":[{"segments":[{"number":"1","arrival":{"at":"2025-07-15T11:30:00","iataCode":"LAX"},"departure":{"at":"2025-07-15T08:00:00","iataCode":"JFK"},"carrierCode":"AA"}]}],"travelerPricings":[{"fareOption":"STANDARD","travelerId":"1","travelerType":"ADULT","fareDetailsBySegment":[{"cabin":"BUSINESS","brandedFare":"BUSFLEX"}]}]}],"dictionaries":{}},"schema":{"path":"/api/flights/upsell","method":"POST","payment":{"amount":"32400","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Get upsell offers for a flight"},"description":"Get upsell offers for a flight"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Upsell endpoint costs $0.03 per request (0.032400 USD in OpenAPI)","source_url":"https://stabletravel.dev/openapi.json"},{"claim":"Request body must use type: flight-offers-upselling","source_url":"https://stabletravel.dev/openapi.json"},{"claim":"Payment via USDC on Base, Solana, or Tempo (x402/MPP protocol) serves as authentication","source_url":"https://stabletravel.dev"},{"claim":"Typical workflow: search → price → book, with upsell as an optional step after search","source_url":"https://stabletravel.dev/openapi.json"},{"claim":"StableTravel is powered by Amadeus and FlightAware","source_url":"https://stabletravel.dev"}],"useCases":["An AI travel agent searches economy flights then automatically fetches upsell offers to present business/first class alternatives to the user","A booking bot compares base fare vs. branded fare bundles (extra legroom, baggage, lounge access) before confirming a purchase","An itinerary optimizer checks whether upgrading a specific leg is cost-effective relative to the traveler's budget","A corporate travel tool surfaces premium options that fall within policy limits after initial search"],"bestFor":["AI agents that need programmatic access to flight cabin upgrades and branded fares","Developers building travel booking flows who want Amadeus GDS data without managing API keys","Pay-as-you-go use cases where subscription pricing is overkill"],"notFor":["Direct consumer-facing flight search (Google Flights endpoint is cheaper for price comparison)","Use cases requiring free/unlimited API calls — every request costs $0.03","Non-flight travel data (use the hotels, activities, or transfers endpoints instead)"],"kindDetails":{"docs":{"llmsTxt":"https://stabletravel.dev/llms.txt","homepage":"https://stabletravel.dev"},"tags":["amadeus","flightaware","flights","hotels","activities","transfers","travel"],"realm":"stabletravel.dev","status":"active","methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}},"provider":{"url":"https://stabletravel.dev","name":"Merit Systems"},"categories":["data","web"],"service_id":"stabletravel","integration":"first-party","service_name":"StableTravel","service_description":"Pay-per-request travel APIs — flights, hotels, activities, transfers, and real-time flight tracking. Powered by Amadeus and FlightAware."},"updatedAt":"2026-04-22T07:15:15.364Z"}}