{"id":"c1f051a1-4ac1-4819-8bf5-1dda3bcb3217","shortId":"f3AHUS","kind":"x402","title":"x402-gated mortgage data endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated mortgage data endpoint on Base, pay-per-request with USDC.","description":"This endpoint at `/api/v1/mortgages/44` is part of the lowpaymentfee.com platform, which offers a variety of pay-per-call APIs gated via the x402 protocol on the Base network. The specific resource appears to serve mortgage-related data (likely a single mortgage record identified by ID 44), though no detailed documentation or response schema is available to confirm the exact payload structure. The endpoint accepts POST requests and returns `application/json`.\n\nPricing is set at a maximum of 20,000 base units of USDC (contract `0x8335…2913` on Base). Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the site-wide flat pricing advertised on the landing page. Payment is handled via the x402 exact-payment scheme: callers attach an `X-PAYMENT` header with a signed payment proof, and the server validates it before returning the response. No API keys, rate limits, or subscriptions are required.\n\nThe broader lowpaymentfee.com platform lists endpoints across data analytics, AI/ML inference, finance, crypto, and utility categories, all at the same $0.02/request price point. However, documentation is extremely sparse — the docs, API, pricing, 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 fields the mortgage endpoint returns. This makes integration speculative without trial-and-error experimentation.","tags":[],"capabilities":["x402-payment","usdc-base","mortgage-data","pay-per-request","json-response","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","Base USDC API","real estate data"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No request or response schema provided; the exact data returned by /api/v1/mortgages/44 is unknown.","No OpenAPI specification or ai-plugin manifest found.","The purpose of this specific mortgage endpoint (ID 44) is unclear — it may be a demo or placeholder."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/44","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what the mortgage endpoint actually returns. The docs pages are empty. This is effectively a stub 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'/request':203 '0.02':126,202 '000':108 '0x8335':114 '20':107 '2913':115 '44':76 '6':121 'Base USDC API' 'accept':94 'across':188 'advertis':137 'ai/ml':191 'analyt':190 'api':48,174,213 'appear':61 'application/json':99 'attach':153 'avail':85 'base':8,22,56,109,117 'broader':183 'call':47 'caller':152 'categori':197 'confirm':87 'connect':222 'consist':129 'content':228 'contract':113 'crypto':194 'data':5,19,67,189 'decim':122 'descript':239 'detail':79 'doc':212 'document':80,207 'endpoint':6,20,30,93,187,245 'error':255 'exact':89,149 'exact-pay':148 'exampl':236 'experiment':256 'extrem':209 'field':242 'financ':193 'flat':135 'gate':3,17,49 'handl':144 'header':158 'home loan API' 'howev':206 'id':75 'identifi':73 'infer':192 'integr':249 'json-response' 'key':175 'land':140 'like':68 'limit':177 'list':186 'lowpaymentfee' 'lowpaymentfee.com':37,184 'make':248 'maximum':105 'mortgag':4,18,65,71,244 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':64 'network':57 'no-api-key' 'offer':40 'openapi':232 'page':141,217 'part':34 'pay':10,24,45 'pay-per-cal':44 'pay-per-request':9,23 'payload':90 'payment':142,150,157,162 'per':11,25,46,127 'platform':38,185 'point':205 'post':95 'price':100,136,204,214 'prompt':224 'proof':163 'protocol':53 'rate':176 'readm':216 'real estate data' 'record':72 'relat':66 'render':219 'request':12,26,96,128 'request/response':235 'requir':181 'resourc':60 'respons':82,172 'return':98,170,246 'schema':83 'scheme':151 'serv':63 'server':166 'set':102 'sign':161 'sinc':118 'singl':70 'site':133 'site-wid':132 'spars':210 'spec':233 'specif':59 'specul':250 'structur':91 'subscript':179 'substant':227 'though':77 'translat':124 'trial':253 'trial-and-error':252 'unit':110 'usdc':14,28,112,119 'usdc-base' 'use':120 'util':196 'valid':167 'varieti':42 'via':50,145 'wallet':223 'wide':134 'without':251 'x':156 'x-payment':155 'x402':2,16,52,147 'x402 mortgage' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"f964c6bb-d2a2-471f-aed6-f94e37248e96","listingId":"c1f051a1-4ac1-4819-8bf5-1dda3bcb3217","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:13.575Z"}],"sources":[{"listingId":"c1f051a1-4ac1-4819-8bf5-1dda3bcb3217","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:13.575Z","lastSeenAt":"2026-04-29T05:34:22.068Z"}],"details":{"listingId":"c1f051a1-4ac1-4819-8bf5-1dda3bcb3217","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/44 \\\n  -H \"X-PAYMENT: <signed-x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, requiring USDC payment on Base network.","source_url":"https://lowpaymentfee.com/api/v1/mortgages/44"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/mortgages/44"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving mortgage record details by ID for financial analysis","Integrating mortgage data into agent workflows without subscription overhead","Programmatic access to mortgage information with crypto micropayments"],"bestFor":["Developers wanting frictionless pay-per-call mortgage data access","AI agents that can settle x402 payments on Base","Projects needing occasional mortgage lookups without API key management"],"notFor":["Bulk mortgage data retrieval (no documented batch endpoints)","Users who need detailed documentation or guaranteed SLAs before integrating","Non-crypto workflows that cannot settle USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.395Z"},"updatedAt":"2026-04-29T05:34:22.068Z"}}