{"id":"31c8cde5-b736-4595-812c-01232cb3eb15","shortId":"UdeEMt","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/90`. 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 specific endpoint `/api/v1/mortgages/90` is listed under the provider's generic \"Premium API Access\" label. The x402 challenge confirms it is live, accepting payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base) with a maximum amount of 20,000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the platform's advertised flat pricing of $0.02/request across all endpoints. The payment scheme is \"exact\" with a 300-second timeout.\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 schema, no request/response examples, and no description of what the `/mortgages/90` endpoint actually returns or what input it expects. The `90` in the path may refer to a specific mortgage product type (e.g., 90% LTV) or a resource ID, but this is purely speculative. Without documentation, callers will need to experiment with POST payloads to discover the expected input format and response structure.","tags":[],"capabilities":["x402-payment","usdc-on-base","pay-per-request","mortgage-data","post-endpoint"],"categories":["finance"],"synonyms":["mortgage API","mortgage rates","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC API","Base network API"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only 'Connect wallet' with no content","No OpenAPI or schema describing request/response format for /api/v1/mortgages/90","The meaning of '90' in the path is unknown — could be a resource ID, LTV percentage, or loan term","The endpoint is not listed on the provider's own homepage among their advertised APIs, raising questions about its status"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/90","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/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the mortgage endpoint accepts or returns. No OpenAPI spec, no examples, no description of the resource. The docs pages are all blank 'Connect wallet' stubs. This is effectively a stub 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'/mortgages/90':194 '/request':143 '0.02':130,142 '000':119 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':110 '20':118 '300':154 '6':125 '90':204,217 'Base network API' 'USDC API' 'accept':105 'access':96 'across':144 'actual':196 'advertis':138 'ai/ml':65 'amount':116 'analyt':64 'api':3,17,60,95,164 'base':6,20,81,112,120 'broader':49 'call':10,24 'caller':230 'challeng':100 'confirm':101 'connect':173 'consist':133 'content':179 'contract':109 'crawl':162 'crypto':68 'data':2,16,37,63 'decim':126 'descript':190 'discov':239 'doc':163 'document':157,229 'dozen':54 'e.g':216 'endpoint':4,18,30,61,85,146,195 'exact':151 'exampl':187 'expect':202,241 'experi':234 'extrem':159 'financ':67 'flat':139 'format':243 'gate':73 'generic':93 'home loan API' 'id':222 'infer':66 'input':200,242 'label':97 'list':88 'live':104 'lowpaymentfee' 'lowpaymentfee.com':32,51 'ltv':218 'maximum':115 'may':208 'mortgag':1,15,35,213 'mortgage API' 'mortgage data' 'mortgage rates' 'mortgage-data' 'mortgage-rel':34 'need':232 'network':82 'offer':53 'openapi':183 'page':168 'part':46 'path':207 'pay':8,22,57 'pay-per-cal':7,21 'pay-per-request':56 'payload':237 'payment':77,106,148 'per':9,23,58,131 'platform':50,136 'post':40,236 'post-endpoint' 'premium':94 'price':140,165 'product':214 'prompt':175 'protocol':78 'provid':33,91 'pure':226 'readm':167 'refer':209 'relat':36 'request':41,59,132 'request/response':186 'resourc':221 'respons':245 'return':170,197 'schema':184 'scheme':149 'second':155 'servic':71 'sinc':122 'span':62 'spars':160 'specif':84,212 'specul':227 'structur':246 'timeout':156 'translat':128 'type':215 'unit':121 'usdc':14,28,108,123 'usdc-on-base' 'use':124 'util':70 'via':11,25,38 'wallet':174 'without':228 'x402':12,26,76,99 'x402 mortgage' 'x402-payment'","prices":[{"id":"82441848-1fa5-4ff8-b724-cbf2b7d65427","listingId":"31c8cde5-b736-4595-812c-01232cb3eb15","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/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:23.362Z"}],"sources":[{"listingId":"31c8cde5-b736-4595-812c-01232cb3eb15","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/90","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:23.362Z","lastSeenAt":"2026-04-29T05:06:25.856Z"}],"details":{"listingId":"31c8cde5-b736-4595-812c-01232cb3eb15","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/90 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base, equating to $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/mortgages/90"},{"claim":"The platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/90"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage-related data or calculations programmatically","Integrating mortgage information into financial dashboards or agent workflows","Pay-per-call access to mortgage data without API key registration"],"bestFor":["Agents or apps needing on-demand mortgage data with crypto micropayments","Developers who want keyless, pay-as-you-go API access on Base","Prototyping financial tools that consume mortgage endpoints"],"notFor":["Users who need well-documented APIs with clear request/response schemas","Production systems requiring guaranteed SLAs and support","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.895Z"},"updatedAt":"2026-04-29T05:06:25.856Z"}}