{"id":"17d68661-9715-4237-a1dd-11b19dcfa881","shortId":"s7ytUM","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-call via x402 with USDC.","tagline":"Mortgage data endpoint on Base, pay-per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/35`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated via the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/mortgages/35` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). This is consistent with the platform's uniform $0.02/request pricing displayed on its landing page. Payment is settled on-chain to the specified payTo address, with a timeout of 300 seconds.\n\nDocumentation for this specific mortgage endpoint is sparse — the crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. The endpoint path suggests it retrieves or processes data for a specific mortgage record (ID 35), but the exact request body schema and response format are not documented. The platform advertises no API keys, no rate limits, and instant access, relying entirely on x402 micropayments for access control.","tags":[],"capabilities":["x402-payment","usdc-base","mortgage-data","pay-per-request","json-api","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC micropayment API","Base network API"],"warnings":["No documentation available for the /api/v1/mortgages/35 endpoint — request and response schemas are unknown","This endpoint is not listed among the advertised APIs on the landing page; its purpose and data content are unclear","All doc pages (docs, pricing, README) returned only 'Connect wallet' with no usable content","The mortgage endpoint may involve regulated financial data; verify compliance requirements before use"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/35","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation for this specific mortgage endpoint — no request schema, no response schema, no examples. The docs/pricing/README pages are all behind a wallet-connect gate. The endpoint path '/mortgages/35' is not listed on the landing page, making its purpose 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'/request':129 '0.02':113,128 '000':102 '0x8335':107 '20':101 '2913':108 '300':151 '35':194 '6':118 'Base network API' 'USDC micropayment API' 'accept':87 'access':32,218,225 'address':146 'advertis':96,209 'ai/ml':63 'analyt':62 'api':59,211 'base':5,18,79,103,110 'bodi':199 'broader':47 'call':9,22 'chain':141 'challeng':95 'connect':172 'consist':122 'content':178 'control':226 'cost':99 'crawl':162 'crypto':66 'data':2,15,37,61,187 'decim':119 'display':131 'doc':163 'document':153,206 'endpoint':3,16,28,85,158,180 'entir':220 'equal':112 'exact':197 'financ':65 'format':203 'gate':71 'home loan API' 'id':193 'infer':64 'instant':217 'json':92 'json-api' 'key':212 'land':134 'limit':215 'lowpaymentfee' 'lowpaymentfee.com':30,49 'maximum':98 'micropay':223 'mortgag':1,14,35,157,191 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':80 'no-api-key' 'offer':51 'on-chain':139 'page':135,167 'part':44 'path':40,181 'pay':7,20,56 'pay-per-cal':6,19 'pay-per-request':55 'payment':75,136 'payto':145 'per':8,21,57,114 'platform':48,125,208 'post':88 'price':130,164 'process':186 'prompt':174 'protocol':76 'provid':31 'rate':214 'readm':166 'record':192 'relat':36 'reli':219 'request':58,89,115,198 'respons':202 'retriev':184 'return':91,169 'schema':200 'second':152 'servic':69 'settl':138 'span':60 'spars':160 'specif':84,156,190 'specifi':144 'suggest':182 'timeout':149 'uniform':127 'unit':104 'usdc':13,26,82,106,116 'usdc-base' 'use':81,117 'util':68 'varieti':53 'via':10,23,72 'wallet':173 'x402':11,24,74,94,222 'x402 mortgage' 'x402-payment'","prices":[{"id":"584f506f-dca7-41d6-9f54-6c06d7250a6b","listingId":"17d68661-9715-4237-a1dd-11b19dcfa881","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:14.862Z"}],"sources":[{"listingId":"17d68661-9715-4237-a1dd-11b19dcfa881","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:14.862Z","lastSeenAt":"2026-04-29T05:34:22.215Z"}],"details":{"listingId":"17d68661-9715-4237-a1dd-11b19dcfa881","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/35 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/mortgages/35"},{"claim":"Platform-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/35"}],"useCases":["Retrieving mortgage record data programmatically with per-call payment","Integrating mortgage information into agent workflows without API key management","Accessing financial data via crypto micropayments on Base"],"bestFor":["Agents or apps needing on-demand mortgage data without subscription commitments","Developers experimenting with x402 pay-per-call patterns","Low-volume or sporadic mortgage data lookups"],"notFor":["High-volume mortgage data pipelines where per-call fees add up","Users who need detailed API documentation and schema guarantees before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.235Z"},"updatedAt":"2026-04-29T05:34:22.215Z"}}