{"id":"123ce508-7762-4046-aa61-060559d27111","shortId":"U6Qe3r","kind":"x402","title":"Mortgage data API endpoint on Base, pay-per-call via x402 with USDC.","tagline":"Mortgage data API endpoint on Base, pay-per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data via a pay-per-request x402 protocol. The specific resource `/api/v1/mortgages/26` appears to return mortgage information (likely for a specific mortgage record or product identified as #26), served as JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of x402-gated APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all at a uniform $0.02/request price point. The platform advertises no API keys, no rate limits, and instant access; callers simply attach an x402 payment header to each request.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the mortgages endpoint accepts or returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body is expected or what the response payload looks like.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","pay-per-request","no-api-key","json-response"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","x402 mortgage","pay-per-call mortgage","USDC API","lowpaymentfee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a wallet-connect prompt with no content","No OpenAPI or schema describing request body or response format for the mortgages endpoint","It is unclear what data 'mortgages/26' returns — could be a specific record, a category, or a placeholder","The platform lists many endpoints but none appear to have public documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/26","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge, but there is zero documentation on request format, response schema, or what 'mortgages/26' actually returns. No OpenAPI spec, no examples, and all doc pages are empty. The listing is essentially a 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'/api/v1/mortgages/26':51 '/docs':152 '/pricing':154 '/readme':156 '/request':121 '0.02':86,120 '26':67 '402':197 'USDC API' 'accept':186 'access':34,135 'advertis':126 'ai/ml':109 'analyt':108 'api':3,17,105,128 'appear':52 'attach':138 'base':6,20,76 'base-network' 'bodi':207 'broader':95 'call':10,24 'caller':136 'challeng':198 'coin':81 'confirm':192 'connect':162 'content':168 'cost':84 'crawl':151 'crypto':112 'data':2,16,39,107 'descript':179 'document':146,201 'dozen':100 'endpoint':4,18,30,90,185,190 'exampl':176 'expect':209 'extrem':148 'field':182 'financ':111 'gate':104 'header':142 'home loan API' 'identifi':65 'infer':110 'inform':56 'instant':134 'json':70 'json-response' 'key':129 'like':57,216 'limit':132 'live':193 'look':215 'lowpaymentfee' 'lowpaymentfee.com':32,97 'mortgag':1,15,37,55,61,184 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':36 'network':77 'no-api-key' 'offer':99 'openapi':172 'page':157 'part':92 'pay':8,22,43 'pay-per-cal':7,21 'pay-per-call mortgage' 'pay-per-request':42 'payload':214 'payment':71,141 'per':9,23,44,87 'platform':96,125 'point':123 'price':122 'product':64 'prompt':164 'proper':196 'protocol':47 'provid':33 'rate':131 'record':62 'relat':38 'request':45,88,145,206 'request/response':175 'resourc':50 'respons':213 'return':54,159,188,194 'schema':173 'serv':68 'servic':115 'settl':73 'simpli':137 'span':106 'spars':149 'specif':49,60 'substant':167 'unclear':204 'uniform':119 'usd':80 'usdc':14,28,79 'usdc-settlement' 'use':78 'util':114 'via':11,25,40 'wallet':163 'without':200 'x402':12,26,46,103,140 'x402 mortgage' 'x402-gated':102 'x402-payment'","prices":[{"id":"af507b8c-efa2-45f3-a932-24fc1688e3a6","listingId":"123ce508-7762-4046-aa61-060559d27111","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:07.556Z"}],"sources":[{"listingId":"123ce508-7762-4046-aa61-060559d27111","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:07.556Z","lastSeenAt":"2026-04-29T05:34:21.891Z"}],"details":{"listingId":"123ce508-7762-4046-aa61-060559d27111","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base, $0.02/call).\n# Using curl as illustration — in practice, use an x402-aware client.\ncurl -X POST https://lowpaymentfee.com/api/v1/mortgages/26 \\\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":"Endpoint returns a valid x402 402 challenge with USDC on Base network, maxAmountRequired 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/mortgages/26"},{"claim":"Platform advertises $0.02/request pricing, no API keys, no rate limits, 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/26"}],"useCases":["Retrieving mortgage data or rates programmatically without API key registration","Integrating mortgage information into agent workflows that support x402 payments","Querying specific mortgage records for financial analysis or comparison tools"],"bestFor":["Agents or apps that already support x402 payment protocol on Base","Quick one-off mortgage data lookups without subscription commitments","Developers experimenting with pay-per-call crypto-settled APIs"],"notFor":["Users needing detailed documentation or guaranteed SLA before integration","Bulk mortgage data retrieval where per-request pricing would be costly","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.626Z"},"updatedAt":"2026-04-29T05:34:21.891Z"}}