{"id":"35c000bb-4ad8-4afd-86ac-6da6ba97692c","shortId":"uLUUZ5","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 at `/api/v1/mortgages/21`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated via the x402 payment protocol on the Base network.\n\nThe specific endpoint `/api/v1/mortgages/21` accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract `0x8335…2913`), 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 uniform $0.02/request pricing across all endpoints. No API keys are required; access is granted by including a valid X-PAYMENT header with each call.\n\nThe platform advertises no rate limits, no minimums, and instant access. However, documentation is extremely sparse — the docs, API, pricing, 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 mortgage data is actually returned (e.g., rates, amortization schedules, property data). The endpoint path suggests it may return data for a specific mortgage record (ID 21), but this is speculative. The x402 challenge is live and well-formed.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","mortgage-data","json-api","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage rates","mortgage data","home loan API","real estate finance","x402 mortgage","USDC pay-per-call","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for /api/v1/mortgages/21","Unknown what mortgage data is returned — the endpoint path and description are generic ('Premium API Access')","The endpoint path '/api/v1/mortgages/21' is not listed on the provider's homepage among available APIs, raising questions about its status"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/21","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no description of what data the mortgage endpoint actually returns. Effectively a stub 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'/request':126 '0.02':116,125 '000':105 '0x8335':97 '20':104 '21':222 '2913':98 '6':111 'USDC pay-per-call' 'accept':83 'access':32,136,160 'across':128 'actual':200 'advertis':152 'ai/ml':61 'amort':204 'amount':102 'analyt':60 'api':56,132,168 'base':5,18,77,95,106 'broader':45 'call':55,149 'challeng':229 'connect':177 'consist':119 'content':183 'contract':96 'crypto':64 'data':2,15,37,59,198,207,215 'decim':112 'descript':194 'doc':167 'document':162 'dozen':50 'e.g':202 'endpoint':3,16,28,57,81,130,209 'exampl':191 'extrem':164 'financ':63 'form':235 'gate':69 'grant':138 'header':146 'home loan API' 'howev':161 'id':221 'includ':140 'infer':62 'instant':159 'json':88 'json-api' 'key':133 'limit':155 'live':231 'lowpaymentfee' 'lowpaymentfee.com':30,47 'maximum':101 'may':213 'minimum':157 'mortgag':1,14,35,197,219 'mortgage API' 'mortgage data' 'mortgage rates' 'mortgage-data' 'mortgage-rel':34 'network':78 'no-api-key' 'offer':49 'openapi':187 'page':172 'part':42 'path':210 'pay':7,20,53 'pay-per-cal':52 'pay-per-request':6,19 'payment':73,89,145 'per':8,21,54,117 'platform':46,122,151 'post':84 'price':127,169 'prompt':179 'properti':206 'protocol':74 'provid':31 'rate':154,203 'readm':171 'real estate finance' 'record':220 'relat':36 'render':174 'request':9,22,85,118 'request/response':190 'requir':135 'return':87,201,214 'schedul':205 'schema':188 'servic':67 'settl':91 'sinc':108 'span':58 'spars':165 'specif':80,218 'specul':226 'substant':182 'suggest':211 'translat':114 'uniform':124 'unit':107 'usdc':13,26,93,109 'usdc-base' 'use':110 'util':66 'valid':142 'via':10,23,70 'wallet':178 'well':234 'well-form':233 'x':144 'x-payment':143 'x402':11,24,72,228 'x402 mortgage' 'x402-payment'","prices":[{"id":"7466a3ee-28c7-4916-b83a-6ae30aec95d3","listingId":"35c000bb-4ad8-4afd-86ac-6da6ba97692c","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:11.161Z"}],"sources":[{"listingId":"35c000bb-4ad8-4afd-86ac-6da6ba97692c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/21","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:11.161Z","lastSeenAt":"2026-04-29T05:34:21.981Z"}],"details":{"listingId":"35c000bb-4ad8-4afd-86ac-6da6ba97692c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/21 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/21"},{"claim":"Platform-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/21"}],"useCases":["Retrieving mortgage-related data programmatically without API key registration","Integrating mortgage information into agent workflows with per-call crypto payments","Accessing financial data via x402 protocol on Base network"],"bestFor":["Developers wanting keyless, pay-per-call mortgage data access","AI agents that can settle x402 payments in USDC on Base","Prototyping financial applications with low per-request costs"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integration","Bulk mortgage data retrieval at scale (no documented batch endpoints)","Users who cannot transact in USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.563Z"},"updatedAt":"2026-04-29T05:34:21.981Z"}}