{"id":"efb2e62b-42c1-4328-b064-7e4839e212e5","shortId":"HdbEeh","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 access to mortgage-related data via a pay-per-request x402 protocol. The specific resource `/api/v1/mortgages/86` accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe broader lowpaymentfee.com platform hosts a variety of x402-gated API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced uniformly at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access; callers simply attach an x402 payment header to each request.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/mortgages/86` endpoint actually returns or what input it expects. The endpoint is confirmed live (returns a proper 402 challenge), but the exact data model and use case for this mortgage resource are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","pay-per-request","json-response","post-method"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","real estate finance","x402 mortgage","lowpaymentfee mortgage","USDC pay-per-call API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or input/output schema provided; request body format and response structure are completely unknown.","The specific purpose of /api/v1/mortgages/86 (what data it returns, what ID 86 represents) is undocumented.","The broader platform lists many endpoint categories but none specifically mention mortgages, suggesting this may be a test or placeholder resource."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/86","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/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no description of what the mortgage endpoint actually returns. The listing is effectively a stub with only pricing and liveness 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'0.02':73,110 '000':77 '20':76 '402':188 '6':81 'USDC pay-per-call API' 'accept':52 'access':34,124 'actual':173 'advertis':115 'ai/ml':99 'analyt':98 'api':3,17,94,117,142 'attach':127 'base':6,20,63,78 'base-network' 'broader':84 'call':10,24 'caller':125 'case':197 'challeng':189 'coin':68 'confirm':183 'connect':150 'content':156 'cost':71 'crypto':102 'data':2,16,39,97,193 'decim':82 'descript':167 'doc':140 'document':135 'endpoint':4,18,30,95,172,181 'exact':192 'exampl':164 'expect':179 'extrem':137 'financ':101 'gate':93 'header':131 'home loan API' 'host':87 'infer':100 'input':177 'instant':123 'json':57 'json-response' 'key':118 'limit':121 'live':184 'lowpaymentfee mortgage' 'lowpaymentfee.com':32,85 'model':194 'mortgag':1,15,37,200 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':36 'network':64 'openapi':160 'page':145 'pay':8,22,43 'pay-per-cal':7,21 'pay-per-request':42 'payment':58,130 'per':9,23,44,74,111 'platform':86,114 'post':53 'post-method' 'price':107,141 'prompt':152 'proper':187 'protocol':47 'provid':33 'rate':120 'readm':144 'real estate finance' 'relat':38 'render':147 'request':45,54,75,112,134 'request/response':163 'resourc':50,201 'return':56,174,185 'schema':161 'servic':105 'settl':60 'simpli':126 'span':96 'spars':138 'specif':49 'substant':155 'uniform':108 'unit':79 'unknown':203 'usd':67 'usdc':14,28,66 'usdc-settlement' 'use':65,196 'util':104 'varieti':89 'via':11,25,40 'wallet':151 'x402':12,26,46,92,129 'x402 mortgage' 'x402-gated':91 'x402-payment'","prices":[{"id":"fcb73d14-8812-48ce-864e-468209b86682","listingId":"efb2e62b-42c1-4328-b064-7e4839e212e5","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/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:25.791Z"}],"sources":[{"listingId":"efb2e62b-42c1-4328-b064-7e4839e212e5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:25.791Z","lastSeenAt":"2026-04-29T05:06:25.938Z"}],"details":{"listingId":"efb2e62b-42c1-4328-b064-7e4839e212e5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/86 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/mortgages/86"},{"claim":"Platform 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/86"}],"useCases":["Retrieving mortgage-related data for a specific record (ID 86)","Integrating mortgage information into financial applications via pay-per-call","Agent-driven lookups of mortgage details without API key management"],"bestFor":["Developers needing on-demand mortgage data without subscription commitments","AI agents that can settle x402 payments on Base with USDC","Applications requiring keyless, pay-as-you-go API access"],"notFor":["Users who need comprehensive mortgage documentation or schema before integrating","Bulk mortgage data retrieval (pay-per-request model may be costly at scale)","Anyone unable to transact USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.767Z"},"updatedAt":"2026-04-29T05:06:25.938Z"}}