{"id":"a7ac0372-ea76-4206-9df7-220445340652","shortId":"fhAVHd","kind":"x402","title":"Mortgage data API endpoint on Base, paid per-request via x402 with USDC.","tagline":"Mortgage data API endpoint on Base, paid 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/6` is part of a broader platform that hosts dozens of API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network.\n\nThe x402 challenge for this endpoint specifies a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required. Payment is made inline via the X-PAYMENT header.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. The mortgage endpoint itself is not listed on the homepage's catalog of available APIs, making its exact input/output schema unclear. It accepts POST requests and returns application/json, but the specific fields for mortgage data (e.g., whether it returns rates, amortization schedules, or property data) cannot be determined from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","per-request-pricing","no-api-key","json-response"],"categories":["finance"],"synonyms":["mortgage API","mortgage rates","mortgage data","home loan API","real estate finance","x402 mortgage","lowpaymentfee"],"warnings":["The /api/v1/mortgages/6 endpoint is not listed in the provider's own homepage API catalog, raising questions about whether it is a production endpoint or a test/placeholder.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no actual content.","No input or output schema is available; the exact data returned by this mortgage endpoint is unknown.","The endpoint path includes a hardcoded ID ('6'), suggesting it may reference a specific mortgage record rather than being a general query endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/6","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/6","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 confirmed) and pricing is clear ($0.02/request in USDC on Base), but there is no documentation, no input/output schema, and the mortgage endpoint is not even listed on the provider's own homepage catalog. It is impossible to determine what data this endpoint actually 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'/request':126 '0.02':114,125 '000':103 '0x8335':108 '20':102 '2913':109 '6':119 'accept':197 'access':34 'across':128 'advertis':123 'ai/ml':67 'amort':215 'amount':100 'analyt':66 'api':3,17,62,133,160,189 'application/json':202 'avail':188,224 'base':6,20,89,104,111 'base-network' 'broader':56 'call':45 'cannot':220 'catalog':186 'challeng':93 'commit':141 'connect':168 'content':174 'crypto':70 'data':2,16,39,65,209,219 'decim':120 'determin':222 'doc':158 'document':153 'dozen':60 'e.g':210 'endpoint':4,18,30,63,75,96,130,177 'equal':113 'exact':192 'extrem':155 'field':206 'financ':69 'header':152 'home loan API' 'homepag':184 'host':59 'infer':68 'inlin':146 'input/output':193 'json-response' 'key':134 'limit':137 'list':181 'lowpaymentfee' 'lowpaymentfee.com':32 'made':145 'make':190 'materi':225 'maximum':99 'minimum':140 'mortgag':1,15,37,176,208 'mortgage API' 'mortgage data' 'mortgage rates' 'mortgage-data' 'mortgage-rel':36 'network':90 'no-api-key' 'page':163 'paid':7,21 'part':53 'pay':43 'pay-per-cal':42 'payment':82,143,151 'per':9,23,44,115 'per-request':8,22 'per-request-pricing' 'platform':57,78,122 'post':198 'price':127,159 'prompt':170 'properti':218 'protocol':47,83 'provid':33 'rate':136,214 'readm':162 'real estate finance' 'relat':38 'render':165 'request':10,24,116,199 'requir':142 'resourc':50 'return':201,213 'schedul':216 'schema':194 'servic':73 'settl':84 'span':64 'spars':156 'specif':49,205 'specifi':97 'substant':173 'unclear':195 'uniform':124 'unit':105 'usdc':14,28,86,107,117 'usdc-settlement' 'use':79,118 'util':72 'via':11,25,40,147 'wallet':169 'whether':211 'x':150 'x-payment':149 'x402':12,26,46,81,92 'x402 mortgage' 'x402-payment'","prices":[{"id":"01c824cb-1fab-4ef4-b531-fe5a868d273a","listingId":"a7ac0372-ea76-4206-9df7-220445340652","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:21.526Z"}],"sources":[{"listingId":"a7ac0372-ea76-4206-9df7-220445340652","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:21.526Z","lastSeenAt":"2026-04-29T05:06:25.794Z"}],"details":{"listingId":"a7ac0372-ea76-4206-9df7-220445340652","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/6 \\\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":"The x402 challenge specifies maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/mortgages/6"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/6"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet' with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage-related financial data programmatically","Integrating mortgage information into financial dashboards or calculators","Agent-driven mortgage data lookups with micropayment settlement"],"bestFor":["Developers needing pay-per-call mortgage data without subscription commitments","AI agents that can settle x402 payments on Base in USDC","Prototyping financial applications that need on-demand mortgage info"],"notFor":["Users who need detailed API documentation or schema definitions before integrating","High-volume mortgage data consumers who need bulk pricing or SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.994Z"},"updatedAt":"2026-04-29T05:06:25.794Z"}}