{"id":"a739dfc4-d093-46a2-a650-9fe65df0f9c9","shortId":"fkbnFC","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 mortgage-related data via a POST request to `/api/v1/mortgages/80`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request 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 `/api/v1/mortgages/80` endpoint accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract `0x8335…2913`). The x402 challenge advertises a `maxAmountRequired` of 20,000 base units; since USDC uses 6 decimals, this equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints. No API keys or rate limits are required; access is instant once payment is attached.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `80` path parameter represents (it could be a loan term, LTV ratio, or other mortgage parameter). The exact request body format and response structure are unknown. Users should expect to experiment or contact the provider for details.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","pay-per-request","no-api-key","json-response"],"categories":["finance"],"synonyms":["mortgage API","mortgage rates","mortgage calculator","home loan data","x402 mortgage","USDC API","lowpaymentfee","pay-per-call finance API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; request body format and response structure are completely unknown","The meaning of the path parameter '80' in /api/v1/mortgages/80 is undocumented","The 'Premium API Access' description is generic and shared across all endpoints on the platform"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/80","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/80","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/request in USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually returns or what the path parameter '80' means. Effectively a stub 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'/api/v1/mortgages/80':43,84 '/docs':159 '/pricing':160 '/readme':163 '/request':130 '0.02':120,129 '000':110 '0x8335':100 '20':109 '2913':101 '6':116 '80':190 'USDC API' 'accept':86 'access':143 'across':132 'advertis':105 'ai/ml':65 'analyt':64 'api':3,17,60,136 'attach':149 'base':6,20,81,98,111 'base-network' 'beyond':151 'bodi':209 'broader':49 'call':10,24 'challeng':104 'connect':169 'consist':123 'contact':222 'content':175 'contract':99 'could':195 'crypto':68 'data':2,16,37,63 'decim':117 'descript':186 'detail':226 'document':150 'dozen':54 'endpoint':4,18,30,61,85,134 'equal':119 'exact':207 'exampl':183 'expect':218 'experi':220 'extrem':156 'financ':67 'format':210 'gate':73 'home loan data' 'infer':66 'instant':145 'json':91 'json-response' 'key':137 'land':153 'limit':140 'loan':198 'lowpaymentfee' 'lowpaymentfee.com':32,51 'ltv':200 'maxamountrequir':107 'mortgag':1,15,35,204 'mortgage API' 'mortgage calculator' 'mortgage rates' 'mortgage-data' 'mortgage-rel':34 'network':82 'no-api-key' 'offer':53 'openapi':179 'page':154,164 'paramet':192,205 'part':46 'path':191 'pay':8,22,57 'pay-per-cal':7,21 'pay-per-call finance API' 'pay-per-request':56 'payment':77,92,147 'per':9,23,58,121 'platform':50 'post':40,87 'price':131 'prompt':171 'protocol':78 'provid':33,224 'rate':139 'ratio':201 'relat':36 'render':166 'repres':193 'request':41,59,88,122,208 'request/response':182 'requir':142 'respons':212 'return':90 'schema':180 'servic':71 'settl':94 'sinc':113 'site':126 'span':62 'spars':157 'structur':213 'term':199 'uniform':128 'unit':112 'unknown':215 'usdc':14,28,96,114 'usdc-settlement' 'use':115 'user':216 'util':70 'via':11,25,38 'wallet':170 'x402':12,26,76,103 'x402 mortgage' 'x402-payment'","prices":[{"id":"60c583e3-fa6d-42ef-a265-426f86a9668b","listingId":"a739dfc4-d093-46a2-a650-9fe65df0f9c9","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:29.406Z"}],"sources":[{"listingId":"a739dfc4-d093-46a2-a650-9fe65df0f9c9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:29.406Z","lastSeenAt":"2026-04-29T04:33:44.501Z"}],"details":{"listingId":"a739dfc4-d093-46a2-a650-9fe65df0f9c9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/80 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/80"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/80"},{"claim":"Platform-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":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching mortgage-related data or calculations programmatically","Integrating mortgage information into financial dashboards or agent workflows","Paying per-request for mortgage data without subscription commitments"],"bestFor":["Developers needing on-demand mortgage data without API key management","AI agents that can settle x402 payments on Base","Projects requiring low-cost, pay-as-you-go financial data endpoints"],"notFor":["Users who need comprehensive mortgage documentation or guaranteed SLA","Anyone unable to pay with USDC on the Base network","Applications requiring bulk/batch mortgage data retrieval at scale"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.635Z"},"updatedAt":"2026-04-29T04:33:44.501Z"}}