{"id":"77ed4382-4be3-42c6-a9dd-ff355744521c","shortId":"xUgrBe","kind":"x402","title":"Mortgage data API endpoint on Base, paid per-request via x402 with USDC.","tagline":"Mortgage data API endpoint on Base, paid per-request via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/68`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance, and utility services — all gated via the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/mortgages/68` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made inline via the X-PAYMENT header with no API keys or rate limits required. The endpoint returns application/json responses.\n\nDocumentation on the site is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint name suggests it returns data about a specific mortgage (ID 68), but the exact request body format and response structure are unknown. The platform's landing page confirms a flat $0.02/request pricing model across all endpoints, instant access, and settlement on the Base network.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","per-request-pricing","no-api-key","json-response"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","real estate finance API","x402 mortgage","lowpaymentfee","pay-per-call mortgage"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for request or response payloads","The endpoint /api/v1/mortgages/68 is not listed among the site's advertised APIs — its purpose and data format are unknown","No example requests or responses available; integration requires trial and error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/68","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The endpoint path '/api/v1/mortgages/68' is not listed on the site's landing page, making its purpose and data format entirely opaque. This is effectively a stub 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'/request':221 '0.02':118,220 '000':107 '0x8335':112 '20':106 '2913':113 '6':123 '68':200 'accept':95 'access':34,93,228 'across':224 'ai/ml':65 'analyt':64 'api':3,17,61,92,137,158 'application/json':146 'avail':187 'base':6,20,80,108,115,233 'base-network' 'bodi':205 'broader':49 'challeng':100 'confirm':217 'connect':166 'cost':104 'data':2,16,39,63,194 'decim':124 'detail':173 'doc':156 'document':148,182 'endpoint':4,18,30,86,144,189,226 'equal':117 'exact':203 'exampl':185 'extrem':153 'financ':67 'flat':219 'format':206 'gate':72 'header':134 'home loan API' 'id':199 'indic':101 'infer':66 'inlin':128 'instant':227 'json-response' 'key':138 'land':215 'limit':141 'list':89 'lowpaymentfee' 'lowpaymentfee.com':32,51 'made':127 'maximum':103 'model':223 'mortgag':1,15,37,198 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':36 'name':190 'network':81,234 'no-api-key' 'offer':53 'openapi':177 'page':161,216 'paid':7,21 'part':46 'path':42 'pay':58 'pay-per-call mortgage' 'pay-per-request':57 'payload':186 'payment':76,125,133 'per':9,23,59,119 'per-request':8,22 'per-request-pricing' 'platform':50,213 'post':96 'premium':91 'price':157,222 'prompt':168 'protocol':77 'provid':33 'rate':140 'readm':160 'real estate finance API' 'relat':38 'render':163 'request':10,24,60,97,120,204 'request/response':180 'requir':142 'respons':147,208 'return':145,193 'schema':181 'servic':70 'settlement':230 'site':151 'span':62 'spars':154 'spec':178 'specif':85,197 'structur':209 'suggest':191 'technic':172 'unit':109 'unknown':211 'usdc':14,28,83,111,121 'usdc-settlement' 'use':82,122 'util':69 'varieti':55 'via':11,25,73,129 'wallet':167 'x':132 'x-payment':131 'x402':12,26,75,99 'x402 mortgage' 'x402-payment'","prices":[{"id":"451c02cb-b589-474c-a5bf-ceb3d52bc0b2","listingId":"77ed4382-4be3-42c6-a9dd-ff355744521c","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:26.374Z"}],"sources":[{"listingId":"77ed4382-4be3-42c6-a9dd-ff355744521c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:26.374Z","lastSeenAt":"2026-04-29T05:06:25.959Z"}],"details":{"listingId":"77ed4382-4be3-42c6-a9dd-ff355744521c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/68 \\\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 x402 challenge returns a maxAmountRequired of 20000 base units of USDC on Base, equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/mortgages/68"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage data for a specific mortgage record (ID 68)","Integrating mortgage information into financial dashboards or agent workflows","Programmatic access to mortgage details without API key management"],"bestFor":["Agents or apps needing on-demand mortgage data with crypto micropayments","Developers who want keyless, pay-per-request access to financial data","x402-compatible clients on the Base network"],"notFor":["Users needing bulk mortgage data exports or batch queries (no documented batch support)","Anyone requiring detailed API documentation or guaranteed SLA before integration","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.766Z"},"updatedAt":"2026-04-29T05:06:25.959Z"}}