{"id":"6818cfa2-69b3-4241-b400-49b2bd39c43f","shortId":"YAwzH6","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/47` 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 47), 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 (0.02 USDC, i.e., $0.02) on Base.\n\nThe platform markets itself as requiring no API keys, no rate limits, and offering instant access. Payment is handled entirely through the x402 payment header mechanism — callers attach a payment proof to each request. The endpoint is live and returns a valid x402 challenge on POST requests. 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 endpoint accepts. The `/api/v1/mortgages/47` path is not listed among the 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 API","lowpaymentfee","x402 mortgage","USDC pay-per-call","Base network API"],"warnings":["No OpenAPI spec or schema available for this endpoint","The /api/v1/mortgages/47 path is not listed among the provider's advertised endpoints on the homepage","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content","Unknown request parameters and response format — no examples available","Unclear whether this is a production endpoint or a test/demo resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/47","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/47","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 no documentation, no OpenAPI spec, no request/response schema, and the specific mortgages/47 path is not listed on the provider's homepage. It is effectively a stub listing with minimal verifiable information about what data is actually 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'0.02':93,115,118 '000':110 '20':109 '47':71 'Base network API' 'USDC pay-per-call' 'accept':213 'access':136 'across':98 'advertis':90 'among':220 'api':47,128,176 'appear':62 'attach':148 'avail':85 'base':5,18,55,111,120 'base-network' 'broad':40 'call':46 'caller':147 'catalog':41 'challeng':104,164 'confirm':105 'connect':184 'content':190 'crawl':86 'data':2,15,68,205 'descript':201 'doc':174 'document':82,169 'endpoint':3,16,28,61,100,156,212,222,234 'entir':140 'exact':74 'extrem':171 'handl':139 'header':145 'home loan API' 'homepag':225 'howev':168 'i.e':117 'id':70 'input':78 'instant':135 'key':129 'limit':132 'list':219 'live':158 'lowpaymentfee' 'lowpaymentfee.com':35 'make':226 'market':123 'materi':87 'maxamountrequir':107 'mechan':146 'model':97 'mortgag':1,14,66,204 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':65 'network':56 'no-api-key' 'offer':38,134 'openapi':194 'page':179 'paramet':79,210 'part':32 'path':216 'pay':7,20,44 'pay-per-cal':43 'pay-per-request':6,19 'payment':137,144,150 'per':8,21,45,94 'platform':36,89,122 'post':166 'price':96,175 'product':233 'prompt':186 'proof':151 'protocol':52 'rate':131 'readm':178 'relat':67 'render':181 'request':9,22,95,154,167 'request/response':197 'requir':126 'resourc':69,238 'respons':75 'return':160,207 'schema':76,198 'serv':64 'settl':48 'spec':195 'specif':60 'substant':189 'test/demo':237 'thin':172 'though':72 'unclear':228 'uniform':92 'unit':112 'usdc':13,26,58,114,116 'usdc-settlement' 'use':57 'valid':162 'via':10,23,49 'wallet':185 'whether':229 'x402':11,24,51,103,143,163 'x402 mortgage' 'x402-payment'","prices":[{"id":"2a4007fa-8377-49dc-81e8-cbad6373e73a","listingId":"6818cfa2-69b3-4241-b400-49b2bd39c43f","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:11.176Z"}],"sources":[{"listingId":"6818cfa2-69b3-4241-b400-49b2bd39c43f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:11.176Z","lastSeenAt":"2026-04-29T05:34:22.044Z"}],"details":{"listingId":"6818cfa2-69b3-4241-b400-49b2bd39c43f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/47 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/47"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/47"}],"useCases":["Retrieving mortgage-related data for a specific resource ID","Integrating mortgage information into financial dashboards","Agent-driven mortgage data lookups with micropayments"],"bestFor":["Developers wanting keyless, pay-per-call mortgage data access","AI agents that can settle x402 payments on Base","Prototyping financial applications with low per-request costs"],"notFor":["Users needing well-documented, schema-validated mortgage APIs","Bulk mortgage data retrieval (no documented batch endpoints)","Anyone unable to pay with USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.457Z"},"updatedAt":"2026-04-29T05:34:22.044Z"}}