{"id":"6247cbec-3356-47c3-857d-a4779c3c99fb","shortId":"gqURMj","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 `/api/v1/mortgages/88` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint appears to serve mortgage-related data (resource ID 88), though the exact response schema and input parameters are not documented in the available crawl material. The platform advertises a uniform $0.02 per request pricing model across its endpoints, and the x402 challenge confirms a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02.\n\nThe platform emphasizes simplicity: no API keys, no rate limits, no commitments, and instant access. Payment is handled entirely through the x402 payment header on each request. The endpoint is live and returns a proper 402 challenge when called without payment. However, documentation is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no description of what mortgage data is returned or what parameters the POST body accepts. The `/api/v1/mortgages/88` path is not listed among the advertised endpoints on the homepage, making it unclear whether this is a production endpoint or a test/demo resource.","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 data","x402 mortgage","USDC pay-per-call","lowpaymentfee","Base network API","402 payment API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","The /api/v1/mortgages/88 endpoint is not listed among the provider's advertised API catalog on the homepage.","No request or response schema is available; input parameters and output format are unknown.","This may be a test, demo, or unlisted endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/88","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and the specific mortgages/88 path is not listed among the provider's advertised endpoints. It is impossible to determine what data is returned or what input is expected without paying for a 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'0.02':93,119 '000':110 '20':109 '402':155 '402 payment API' '6':115 '88':71 'Base network API' 'USDC pay-per-call' 'accept':207 'access':134 'across':98 'advertis':90,216 'among':214 'api':47,125,169 'appear':62 'avail':85 'base':5,18,55,111 'base-network' 'bodi':206 'broad':40 'call':9,22,158 'catalog':41 'challeng':104,156 'commit':131 'confirm':105 'connect':177 'content':183 'crawl':86 'data':2,15,68,198 'decim':116 'descript':194 'doc':167 'document':82,162 'emphas':122 'endpoint':3,16,28,61,100,148,217,229 'entir':138 'equal':118 'exact':74 'extrem':164 'handl':137 'header':143 'home loan data' 'homepag':220 'howev':161 'id':70 'input':78 'instant':133 'key':126 'limit':129 'list':213 'live':150 'lowpaymentfee' 'lowpaymentfee.com':35 'make':221 'materi':87 'maxamountrequir':107 'model':97 'mortgag':1,14,66,197 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':65 'network':56 'no-api-key' 'offer':38 'openapi':187 'page':172 'paramet':79,203 'part':32 'path':210 'pay':7,20,44 'pay-per-cal':6,19 'pay-per-request':43 'payment':135,142,160 'per':8,21,45,94 'platform':36,89,121 'post':205 'price':96,168 'product':228 'prompt':179 'proper':154 'protocol':52 'rate':128 'readm':171 'relat':67 'render':174 'request':46,95,146 'request/response':190 'resourc':69,233 'respons':75 'return':152,200 'schema':76,191 'serv':64 'settl':48 'simplic':123 'spec':188 'specif':60 'substant':182 'test/demo':232 'thin':165 'though':72 'unclear':223 'uniform':92 'unit':112 'usdc':13,26,58,114 'usdc-settlement' 'use':57 'via':10,23,49 'wallet':178 'whether':224 'without':159 'x402':11,24,51,103,141 'x402 mortgage' 'x402-payment'","prices":[{"id":"93a3b58c-6169-4813-9240-e3058042ca5e","listingId":"6247cbec-3356-47c3-857d-a4779c3c99fb","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:30.611Z"}],"sources":[{"listingId":"6247cbec-3356-47c3-857d-a4779c3c99fb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/88","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:30.611Z","lastSeenAt":"2026-04-29T04:33:44.559Z"}],"details":{"listingId":"6247cbec-3356-47c3-857d-a4779c3c99fb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/88 \\\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 pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/mortgages/88"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no substantive documentation.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage-related data for a specific resource ID","Integrating mortgage information into financial applications via pay-per-call","Agent-driven mortgage data lookups without API key management"],"bestFor":["Developers wanting frictionless pay-per-call mortgage data access","AI agents that can settle x402 payments on Base","Projects needing mortgage data without subscription commitments"],"notFor":["Users needing well-documented, schema-validated mortgage APIs","Bulk mortgage data retrieval (pay-per-request model may be costly at scale)","Anyone requiring fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.534Z"},"updatedAt":"2026-04-29T04:33:44.559Z"}}