{"id":"709e3925-f6e8-4fe8-a2ae-27db52ac3b5f","shortId":"cZgTTj","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/52`. 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 gated via the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/mortgages/52` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). This is consistent with the platform's advertised flat pricing of $0.02 per request across all endpoints. No API keys are required; payment is handled inline via the X-PAYMENT header.\n\nDocumentation on the site is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/mortgages/52` resource actually returns. The endpoint path suggests it retrieves or processes data for a specific mortgage record (ID 52), but the exact input parameters and response shape are unknown. The platform appears live and functional based on the 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","mortgage-data","json-api","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC pay-per-call","Base network API"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no technical content","No OpenAPI or schema describing request parameters or response format for /api/v1/mortgages/52","The purpose and data returned by this specific mortgage endpoint are entirely unknown","The endpoint path includes a hardcoded ID (52), and it is unclear whether this is parameterized or fixed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/52","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/52","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), but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the mortgage endpoint actually returns. This is effectively a stub 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'/mortgages/52':191 '0.02':113,131 '000':102 '0x8335':107 '20':101 '2913':108 '402':230 '52':210 '6':118 'Base network API' 'USDC pay-per-call' 'accept':87 'access':32 'across':134 'actual':193 'advertis':96,127 'ai/ml':63 'analyt':62 'api':58,138,163 'appear':223 'base':5,18,79,103,110,227 'broader':47 'call':9,22 'challeng':95,231 'connect':169 'consist':122 'cost':99 'crypto':66 'data':2,15,37,61,203 'decim':119 'descript':187 'detail':176 'doc':160 'document':152 'dozen':52 'endpoint':3,16,28,59,85,136,196 'equal':112 'exact':213 'exampl':184 'extrem':157 'financ':65 'flat':128 'function':226 'gate':71 'handl':144 'header':151 'home loan API' 'id':209 'infer':64 'inlin':145 'input':214 'json':92 'json-api' 'key':139 'live':224 'lowpaymentfee' 'lowpaymentfee.com':30,49 'maximum':98 'mortgag':1,14,35,207 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':80 'no-api-key' 'offer':51 'openapi':180 'page':164 'paramet':215 'part':44 'path':40,197 'pay':7,20,55 'pay-per-cal':6,19 'pay-per-request':54 'payment':75,142,150 'per':8,21,56,114,132 'platform':48,125,222 'post':88 'price':129,161 'process':202 'prompt':171 'protocol':76 'provid':31 'record':208 'relat':36 'render':166 'request':57,89,115,133 'request/response':183 'requir':141 'resourc':192 'respons':217,232 'retriev':200 'return':91,194 'schema':181 'servic':69 'shape':218 'site':155 'span':60 'spars':158 'specif':84,206 'suggest':198 'technic':175 'unit':104 'unknown':220 'usdc':13,26,82,106,116 'usdc-base' 'use':81,117 'util':68 'via':10,23,72,146 'wallet':170 'x':149 'x-payment':148 'x402':11,24,74,94 'x402 mortgage' 'x402-payment'","prices":[{"id":"f782cda8-1ad6-4792-a7f9-d0b4260a6651","listingId":"709e3925-f6e8-4fe8-a2ae-27db52ac3b5f","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:26.976Z"}],"sources":[{"listingId":"709e3925-f6e8-4fe8-a2ae-27db52ac3b5f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:26.976Z","lastSeenAt":"2026-04-29T04:33:44.421Z"}],"details":{"listingId":"709e3925-f6e8-4fe8-a2ae-27db52ac3b5f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/52 \\\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 per request 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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/52"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage record data programmatically with per-call USDC payment","Integrating mortgage information into financial dashboards or agent workflows","Querying specific mortgage details without subscription or API key management"],"bestFor":["Agents or apps that need on-demand mortgage data with crypto micropayments","Developers wanting keyless, pay-as-you-go API access on Base","Prototyping financial tools that consume mortgage data without upfront commitments"],"notFor":["Users who need detailed documentation or guaranteed SLA before integrating","Bulk mortgage data retrieval where per-call pricing would be cost-prohibitive","Non-crypto workflows that cannot send x402 payment headers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.752Z"},"updatedAt":"2026-04-29T04:33:44.421Z"}}