{"id":"023f2eda-bb01-4515-bf7f-a97ba49e4467","shortId":"tZFYLh","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-call via x402 with USDC.","tagline":"Mortgage data endpoint on Base, pay-per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/77`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network with no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint `/api/v1/mortgages/77` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). This is consistent with the platform's uniform $0.02/request pricing shown on the landing page. Payment is made via the x402 `exact` scheme to the specified wallet address on Base.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what mortgage data is returned. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what fields the response contains or what input the POST body expects.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","real estate finance","lowpaymentfee","x402 mortgage","USDC API","pay-per-call mortgage"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response format","The endpoint path /api/v1/mortgages/77 references a specific ID; it is unclear whether other IDs are available or what data is returned","The mortgage endpoint is not listed on the landing page's catalog of available APIs, raising questions about its status"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/77","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/mortgages/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is virtually no documentation: no OpenAPI schema, no request/response examples, no description of what mortgage data is returned, and all doc pages render only 'Connect wallet'. The endpoint path suggests a single fixed resource (ID 77) with unclear 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'/request':141 '0.02':123,140 '000':118 '20':117 '402':209 '6':130 'USDC API' 'accept':106 'access':32,104 'address':160 'ai/ml':63 'analyt':62 'api':58,86,103,169 'base':5,18,82,119,162 'base-network' 'bodi':227 'broader':47 'call':9,22 'challeng':111,210 'connect':178 'consist':134 'contain':221 'content':184 'cost':115 'crypto':66 'data':2,15,37,61,199 'decim':131 'descript':195 'doc':168 'document':163,213 'dozen':52 'endpoint':3,16,28,59,71,97,203 'exact':154 'exampl':192 'expect':228 'extrem':165 'field':218 'financ':65 'home loan API' 'indic':112 'infer':64 'input':224 'key':87 'land':146 'limit':90 'list':100 'live':205 'lowpaymentfee' 'lowpaymentfee.com':30,49 'made':150 'maximum':114 'mortgag':1,14,35,198 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':83 'no-api-key' 'offer':51 'openapi':188 'page':147,173 'part':44 'path':40 'pay':7,20,55 'pay-per-cal':6,19 'pay-per-call mortgage' 'pay-per-request':54 'payment':75,148 'per':8,21,56,125 'platform':48,137 'post':107,226 'premium':102 'price':142,170 'prompt':180 'proper':208 'protocol':76 'provid':31 'rate':89 'readm':172 'real estate finance' 'relat':36 'render':175 'request':57,108,126 'request/response':191 'requir':94 'respons':220 'return':201,206 'schema':189 'scheme':155 'servic':69 'settl':77 'shown':143 'sinc':127 'span':60 'spars':166 'specif':96 'specifi':158 'subscript':93 'unclear':216 'uniform':139 'unit':120 'usd':124 'usdc':13,26,79,122,128 'usdc-settlement' 'use':72,129 'util':68 'via':10,23,151 'wallet':159,179 'without':212 'x402':11,24,74,110,153 'x402 mortgage' 'x402-payment'","prices":[{"id":"9cdbd14d-5b00-44c2-9b59-0cf9a171a316","listingId":"023f2eda-bb01-4515-bf7f-a97ba49e4467","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/mortgages/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:25.192Z"}],"sources":[{"listingId":"023f2eda-bb01-4515-bf7f-a97ba49e4467","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:25.192Z","lastSeenAt":"2026-04-29T05:06:25.899Z"}],"details":{"listingId":"023f2eda-bb01-4515-bf7f-a97ba49e4467","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/77 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/77"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage-related data for a specific record (ID 77)","Integrating mortgage information into financial dashboards or agent workflows","Programmatic access to mortgage data without subscription or API key management"],"bestFor":["Agents or apps needing on-demand mortgage data with crypto micropayments","Developers who want keyless, pay-per-use API access on Base","Quick prototyping where subscription-free access is preferred"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","Bulk mortgage data retrieval (no documented batch endpoints)","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.865Z"},"updatedAt":"2026-04-29T05:06:25.899Z"}}