{"id":"fc4b2ab6-18d4-4dab-ad63-98b195cf2417","shortId":"kTQMz7","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-request via x402 with USDC.","tagline":"Mortgage data endpoint on Base, pay-per-request via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data via a pay-per-call x402 protocol. The specific resource `/api/v1/mortgages/37` appears to serve mortgage information (likely a specific mortgage record or calculation) and accepts POST requests. Payment is settled in USDC on the Base network at $0.02 per request.\n\nThe provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance, crypto, infrastructure utilities, and more — 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. However, documentation is extremely thin: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail.\n\nBecause there is no OpenAPI schema, no request/response examples, and no documentation describing what the `/api/v1/mortgages/37` endpoint actually returns or what POST body it expects, the exact capabilities of this endpoint are unclear. The x402 challenge is live and well-formed, confirming the endpoint is operational and will accept payment, but the lack of documentation makes integration speculative.","tags":[],"capabilities":["x402-payment","usdc-base","mortgage-data","pay-per-request","post-endpoint"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC pay-per-call","Base network API"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for this endpoint","The purpose of '/api/v1/mortgages/37' (specific record vs. calculation) is unclear","The '/mortgages/' path is not listed on the provider's homepage catalog, raising questions about whether it is a supported production endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/37","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint is operational. However, there is zero documentation on request format, response schema, or what 'mortgages/37' actually returns. No OpenAPI spec, no examples, and all doc pages are empty. This is effectively a stub 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'0.02':76,106 'Base network API' 'USDC pay-per-call' 'accept':63,204 'access':32,120 'actual':172 'advertis':111 'ai/ml':94 'analyt':93 'api':90,113,138 'appear':50 'attach':123 'base':5,18,73 'bodi':177 'broad':84 'calcul':61 'call':43 'caller':121 'capabl':182 'catalog':85 'challeng':190 'confirm':197 'connect':147 'crypto':97 'data':2,15,37,92 'describ':167 'detail':154 'doc':137 'document':132,166,210 'endpoint':3,16,28,171,185,199 'exact':181 'exampl':163 'expect':179 'extrem':134 'financ':96 'form':196 'gate':89 'header':127 'home loan API' 'host':82 'howev':131 'infer':95 'inform':54 'infrastructur':98 'instant':119 'integr':212 'key':114 'lack':208 'like':55 'limit':117 'live':192 'lowpaymentfee' 'lowpaymentfee.com':30,81 'make':211 'mortgag':1,14,35,53,58 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':74 'openapi':159 'oper':201 'page':142 'pay':7,20,41 'pay-per-cal':40 'pay-per-request':6,19 'payment':66,126,205 'per':8,21,42,77,107 'platform':110 'post':64,176 'post-endpoint' 'price':103,139 'prompt':149 'protocol':45 'provid':31,80 'rate':116 'readm':141 'record':59 'relat':36 'render':144 'request':9,22,65,78,108,130 'request/response':162 'resourc':48 'return':173 'schema':160 'serv':52 'settl':68 'simpli':122 'span':91 'specif':47,57 'specul':213 'technic':153 'thin':135 'unclear':187 'uniform':104 'usdc':13,26,70 'usdc-base' 'util':99 'via':10,23,38 'wallet':148 'well':195 'well-form':194 'x402':11,24,44,88,125,189 'x402 mortgage' 'x402-gated':87 'x402-payment'","prices":[{"id":"816a1333-fac9-404e-8a0e-5292ad4b32c1","listingId":"fc4b2ab6-18d4-4dab-ad63-98b195cf2417","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:18.527Z"}],"sources":[{"listingId":"fc4b2ab6-18d4-4dab-ad63-98b195cf2417","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:18.527Z","lastSeenAt":"2026-04-29T05:34:22.309Z"}],"details":{"listingId":"fc4b2ab6-18d4-4dab-ad63-98b195cf2417","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/37 \\\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 endpoint returns a 402 x402 challenge with USDC on Base network at maxAmountRequired 20000 (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/mortgages/37"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/mortgages/37"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage record or calculation data on demand","Integrating mortgage information into financial applications","Agent-driven mortgage data lookups with micropayments"],"bestFor":["Developers needing on-demand mortgage data without API key management","AI agents that can settle x402 payments on Base","Applications requiring pay-per-use financial data endpoints"],"notFor":["Users who need detailed API documentation before integrating","Bulk mortgage data retrieval (pay-per-request model may be costly at scale)","Non-crypto users who cannot settle USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.123Z"},"updatedAt":"2026-04-29T05:34:22.309Z"}}