{"id":"39a898b7-ad55-45c1-b535-d703148192e2","shortId":"ysKzLG","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-request via x402 with USDC.","tagline":"Mortgage data endpoint on Base, pay-per-request via x402 with USDC.","description":"This endpoint at `/api/v1/mortgages/17` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-call APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint appears to serve mortgage-related data (resource ID 17), though the exact response schema and input parameters are not documented in the available crawl material. The endpoint is live and returns a valid x402 challenge on POST.\n\nThe platform advertises a flat $0.02 per request across its API catalog, and the x402 challenge for this endpoint shows a `maxAmountRequired` of 20,000 base units of USDC (which is $0.02 given USDC's 6 decimals). Payment is made via the x402 exact scheme to a specified wallet address on Base. No API keys or rate limits are advertised — access is gated purely by micropayment. The site lists dozens of endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services, all at the same price point.\n\nDocumentation is extremely sparse. 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 examples, and no description of what mortgage data this endpoint actually returns. The endpoint's purpose must be inferred entirely from its URL path.","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","lowpaymentfee","USDC micropayment API","Base network API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for the mortgages endpoint","The specific purpose of '/api/v1/mortgages/17' (resource ID 17) is unknown — it is not listed on the site's homepage catalog","Cannot verify what data is returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/17","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/17","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 zero documentation on what the mortgage endpoint actually returns, what inputs it accepts, or what 'mortgages/17' represents. No OpenAPI spec, no examples, and all doc pages are empty. The listing is essentially a 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'0.02':105,131 '000':124 '17':71 '20':123 '6':135 'Base network API' 'USDC micropayment API' 'access':160 'across':108 'actual':227 'address':149 'advertis':102,159 'ai/ml':175 'analyt':174 'api':47,110,153,195 'appear':62 'avail':85 'base':5,18,55,125,151 'base-network' 'broad':40 'call':46 'catalog':41,111 'challeng':97,115 'connect':203 'content':209 'crawl':86 'crypto':178 'data':2,15,68,173,224 'decim':136 'descript':220 'doc':193 'document':82,188 'dozen':169 'endpoint':3,16,28,61,89,118,171,226,230 'entir':236 'exact':74,143 'exampl':217 'extrem':190 'financ':177 'flat':104 'gate':162 'given':132 'home loan data' 'id':70 'infer':176,235 'input':78 'key':154 'limit':157 'list':168 'live':91 'lowpaymentfee' 'lowpaymentfee.com':35 'made':139 'materi':87 'maxamountrequir':121 'micropay':165 'mortgag':1,14,66,223 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':65 'must':233 'network':56 'no-api-key' 'offer':38 'openapi':213 'page':198 'paramet':79 'part':32 'path':240 'pay':7,20,44 'pay-per-cal':43 'pay-per-request':6,19 'payment':137 'per':8,21,45,106 'platform':36,101 'point':187 'post':99 'price':186,194 'prompt':205 'protocol':52 'pure':163 'purpos':232 'rate':156 'readm':197 'relat':67 'render':200 'request':9,22,107 'request/response':216 'resourc':69 'respons':75 'return':93,228 'schema':76 'scheme':144 'serv':64 'servic':181 'settl':48 'show':119 'site':167 'span':172 'spars':191 'spec':214 'specif':60 'specifi':147 'substant':208 'though':72 'unit':126 'url':239 'usdc':13,26,58,128,133 'usdc-settlement' 'use':57 'util':180 'valid':95 'via':10,23,49,140 'wallet':148,204 'x402':11,24,51,96,114,142 'x402 mortgage' 'x402-payment'","prices":[{"id":"88410faf-cda8-42ac-80b1-1a2b8f781d44","listingId":"39a898b7-ad55-45c1-b535-d703148192e2","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:17.316Z"}],"sources":[{"listingId":"39a898b7-ad55-45c1-b535-d703148192e2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:17.316Z","lastSeenAt":"2026-04-29T05:34:22.241Z"}],"details":{"listingId":"39a898b7-ad55-45c1-b535-d703148192e2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/17 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/17"},{"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":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/17"}],"useCases":["Retrieving mortgage-related data for a specific resource (ID 17)","Integrating pay-per-call mortgage information into financial applications","Agent-driven lookups of mortgage data without API key management"],"bestFor":["Developers needing on-demand mortgage data with no subscription commitment","AI agents that can settle x402 micropayments on Base","Prototyping financial tools that consume mortgage information"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Bulk mortgage data retrieval where per-request costs would accumulate significantly","Anyone unable to settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.225Z"},"updatedAt":"2026-04-29T05:34:22.241Z"}}