{"id":"a708efae-c544-4ab3-a4f9-af6d6db87998","shortId":"XPQBpV","kind":"x402","title":"Mortgage data API endpoint on Base, paid per-request via x402 with USDC.","tagline":"Mortgage data API endpoint on Base, paid per-request via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data via a POST request to `/api/v1/mortgages/1`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated by the x402 payment protocol on the Base network.\n\nThe specific `/api/v1/mortgages/1` endpoint is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals, so 20000 / 10^6 = $0.02). Payment is settled on-chain on Base using the x402 \"exact\" scheme. No API keys or accounts are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no description of what mortgage data is actually returned. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what fields the POST body should contain or what the response payload looks like.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","per-request-pricing","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","mortgage rates","lowpaymentfee","x402 mortgage","pay-per-call mortgage"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all render only a wallet-connect prompt with no content.","No request or response schema provided; callers cannot know what to send or expect back.","The /api/v1/mortgages/1 endpoint is not listed among the site's advertised APIs, raising questions about whether it is a production endpoint or a test/demo route.","Endpoint description is generic ('Premium API Access') and does not describe the actual data returned."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/1","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/1","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 402 challenge, confirming it works. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a title, and no examples. The mortgage-specific endpoint is not even listed on the site's landing page among its advertised APIs, making its purpose 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'/api/v1/mortgages/1':45,87 '/docs':163 '/pricing':165 '/readme':167 '0.02':111,122 '000':100 '0x8335':105 '10':120 '20':99 '20000':119 '2913':106 '402':206 '6':116,121 'access':34,94 'account':140 'actual':196 'ai/ml':67 'analyt':66 'api':3,17,62,93,137 'attach':145 'base':6,20,83,101,108,130 'base-network' 'bodi':218 'broader':51 'call':61 'caller':143 'chain':128 'challeng':207 'charg':96 'confirm':201 'connect':173 'contain':220 'content':179 'crawl':162 'crypto':70 'data':2,16,39,65,194 'decim':117 'descript':190 'document':157,210 'dozen':56 'endpoint':4,18,30,63,88,199 'equal':110 'exact':134 'extrem':159 'field':215 'financ':69 'gate':75 'header':150 'home loan API' 'infer':68 'key':138 'like':227 'list':90 'live':202 'look':226 'lowpaymentfee' 'lowpaymentfee.com':32,53 'mortgag':1,15,37,193 'mortgage API' 'mortgage data' 'mortgage rates' 'mortgage-data' 'mortgage-rel':36 'network':84 'no-api-key' 'offer':55 'on-chain':126 'openapi':183 'page':168 'paid':7,21 'part':48 'pay':59 'pay-per-cal':58 'pay-per-call mortgage' 'payload':225 'payment':79,123,149,155 'per':9,23,60,112 'per-request':8,22 'per-request-pricing' 'platform':52 'post':42,217 'premium':92 'prompt':175 'proof':156 'proper':205 'protocol':80 'provid':33 'relat':38 'request':10,24,43,113 'request/response':186 'requir':142 'respons':224 'return':170,197,203 'schema':187 'scheme':135 'servic':73 'settl':125 'simpli':144 'span':64 'spars':160 'spec':184 'specif':86 'unclear':213 'unit':102 'usdc':14,28,104,114 'usdc-settlement' 'use':115,131 'util':72 'valid':153 'via':11,25,40 'wallet':174 'without':209 'x':148 'x-payment':147 'x402':12,26,78,133,154 'x402 mortgage' 'x402-payment'","prices":[{"id":"30319914-6f37-4b9d-a1f2-1638848db258","listingId":"a708efae-c544-4ab3-a4f9-af6d6db87998","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:11.175Z"}],"sources":[{"listingId":"a708efae-c544-4ab3-a4f9-af6d6db87998","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:11.175Z","lastSeenAt":"2026-04-29T05:34:22.020Z"}],"details":{"listingId":"a708efae-c544-4ab3-a4f9-af6d6db87998","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/1 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/1"},{"claim":"The platform advertises $0.02 per request pricing 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/1"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage data or calculations on a per-request basis","Integrating mortgage information into agent workflows without API key management","Programmatic access to mortgage records settled via on-chain micropayments"],"bestFor":["Agents or apps needing on-demand mortgage data with no subscription","Developers experimenting with x402 pay-per-call APIs on Base","Workflows that require keyless, permissionless API access to financial data"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume mortgage data consumers who need bulk pricing or rate limits guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.467Z"},"updatedAt":"2026-04-29T05:34:22.020Z"}}