{"id":"e0e26246-53b6-42f5-b831-5329289918f6","shortId":"MbRfFv","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-call via x402 with USDC.","tagline":"Mortgage data endpoint on Base, pay-per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data at `/api/v1/mortgages/99`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request APIs 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/99` accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract `0x8335…2913`). The x402 challenge advertises a `maxAmountRequired` of 20,000 base units; since USDC uses 6 decimals, this equals $0.02 per request — consistent with the platform's uniform $0.02/request pricing displayed on its landing page. No API keys or rate limits are required; access is granted immediately upon valid x402 payment.\n\nDocumentation is extremely sparse. The `/docs`, `/pricing`, `/api`, and `/README` pages all render 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 endpoint actually returns (e.g., whether \"99\" is a resource ID, a product type, or something else). The endpoint is live and responds with a well-formed 402 challenge, but the lack of documentation makes it difficult to know what data to send or what to expect back.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","mortgage-data","json-api","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC pay-per-call","Base network API"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or request/response schema provided","Purpose of /api/v1/mortgages/99 is unclear — unknown what data it returns or what input it expects","The endpoint path suggests a specific resource ID (99) but no context is given"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/99","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/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the mortgages/99 resource represents. The docs pages are all blank 'Connect wallet' stubs. This is effectively a stub 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'/api/v1/mortgages/99':39,81 '/docs':154 '/pricing':155 '/readme':158 '/request':126 '0.02':116,125 '000':106 '0x8335':96 '20':105 '2913':97 '402':213 '6':112 '99':191 'Base network API' 'USDC pay-per-call' 'accept':82 'access':32,141 'actual':187 'advertis':101 'ai/ml':60 'analyt':59 'api':56,134 'back':233 'base':5,18,76,94,107 'broader':45 'call':9,22 'challeng':100,214 'connect':164 'consist':119 'content':170 'contract':95 'crypto':63 'data':2,15,37,58,226 'decim':113 'descript':181 'difficult':222 'display':128 'document':149,219 'dozen':50 'e.g':189 'els':201 'endpoint':3,16,28,80,186,203 'equal':115 'exampl':178 'expect':232 'extrem':151 'financ':62 'form':212 'gate':68 'grant':143 'home loan API' 'id':195 'immedi':144 'infer':61 'json':87 'json-api' 'key':135 'know':224 'lack':217 'land':131 'limit':138 'live':205 'lowpaymentfee' 'lowpaymentfee.com':30,47 'make':220 'maxamountrequir':103 'mortgag':1,14,35,185 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':77 'no-api-key' 'offer':49 'openapi':174 'page':132,159 'part':42 'pay':7,20,53 'pay-per-cal':6,19 'pay-per-request':52 'payment':72,88,148 'per':8,21,54,117 'platform':46,122 'post':83 'price':127 'product':197 'prompt':166 'protocol':73 'provid':31 'rate':137 'relat':36 'render':161 'request':55,84,118 'request/response':177 'requir':140 'resourc':194 'respond':207 'return':86,188 'schema':175 'send':228 'servic':66 'settl':90 'sinc':109 'someth':200 'span':57 'spars':152 'specif':79 'type':198 'uniform':124 'unit':108 'upon':145 'usdc':13,26,92,110 'usdc-base' 'use':111 'util':65 'valid':146 'via':10,23,69 'wallet':165 'well':211 'well-form':210 'whether':190 'x402':11,24,71,99,147 'x402 mortgage' 'x402-payment'","prices":[{"id":"ba1da2d8-7f77-4361-a1e5-1c28cf9b288e","listingId":"e0e26246-53b6-42f5-b831-5329289918f6","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/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:37.234Z"}],"sources":[{"listingId":"e0e26246-53b6-42f5-b831-5329289918f6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:37.234Z","lastSeenAt":"2026-04-29T04:33:44.765Z"}],"details":{"listingId":"e0e26246-53b6-42f5-b831-5329289918f6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/99 \\\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":"Uniform $0.02/request pricing, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/99"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/99"}],"useCases":["Retrieving mortgage-related data or calculations on a per-request basis","Integrating mortgage information into agent workflows without API key management","Paying for financial data access with USDC on Base L2"],"bestFor":["Developers or agents wanting keyless, pay-per-call mortgage data","x402-compatible agents on the Base network","Quick one-off mortgage data lookups without subscription commitments"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume mortgage data pipelines where per-call pricing may add up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.249Z"},"updatedAt":"2026-04-29T04:33:44.765Z"}}