{"id":"4b857a17-abe3-424f-bade-5f61248fdb4d","shortId":"yfaMqJ","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 the path `/api/v1/mortgages/70`. 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 using USDC.\n\nThe specific endpoint `/api/v1/mortgages/70` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). This is consistent with the site's stated flat pricing of $0.02 per request across all endpoints. No API keys are required; payment is handled inline via the X-PAYMENT header per the x402 protocol.\n\nDocumentation on the site 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/70` endpoint actually returns beyond the generic label \"Premium API Access.\" The `70` in the path likely refers to a specific mortgage record or configuration parameter, but this is not documented. Users should expect to experiment or contact the provider for details on the request body format and response structure.","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 — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; request body format is unknown","The meaning of '/mortgages/70' (the '70' parameter) is undocumented","The endpoint is labeled generically as 'Premium API Access' with no mortgage-specific description from the provider"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/70","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge) and pricing is clear at $0.02/request in USDC on Base. However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the specific /mortgages/70 path is entirely undocumented. This is effectively a stub 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'0.02':112,130 '000':101 '0x8335':106 '20':100 '2913':107 '6':117 '70':206 'Base network API' 'USDC pay-per-call' 'accept':86 'access':32,204 'across':133 'actual':196 'advertis':95 'ai/ml':62 'analyt':61 'api':58,137,165,203 'base':5,18,78,102,109 'beyond':198 'bodi':239 'broader':47 'call':9,22 'challeng':94 'configur':218 'connect':173 'consist':121 'contact':231 'content':179 'cost':98 'crypto':65 'data':2,15,37,60 'decim':118 'descript':190 'detail':235 'doc':163 'document':155,224 'dozen':52 'endpoint':3,16,28,84,135,195 'equal':111 'exampl':187 'expect':227 'experi':229 'extrem':160 'financ':64 'flat':127 'format':240 'gate':70 'generic':200 'handl':143 'header':150 'home loan API' 'infer':63 'inlin':144 'json':91 'json-api' 'key':138 'label':201 'like':210 'lowpaymentfee' 'lowpaymentfee.com':30,49 'maximum':97 'mortgag':1,14,35,215 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':79 'no-api-key' 'offer':51 'openapi':183 'page':168 'paramet':219 'part':44 'path':40,209 'pay':7,20,55 'pay-per-cal':6,19 'pay-per-request':54 'payment':74,141,149 'per':8,21,56,113,131,151 'platform':48 'post':87 'premium':202 'price':128,164 'prompt':175 'protocol':75,154 'provid':31,233 'readm':167 'record':216 'refer':211 'relat':36 'render':170 'request':57,88,114,132,238 'request/response':186 'requir':140 'respons':242 'return':90,197 'schema':184 'servic':68 'site':124,158 'span':59 'spars':161 'specif':83,214 'state':126 'structur':243 'substant':178 'unit':103 'usdc':13,26,81,105,115 'usdc-base' 'use':80,116 'user':225 'util':67 'via':10,23,71,145 'wallet':174 'x':148 'x-payment':147 'x402':11,24,73,93,153 'x402 mortgage' 'x402-payment'","prices":[{"id":"df93bd9f-2437-4be4-aa91-c0ba3aa6332e","listingId":"4b857a17-abe3-424f-bade-5f61248fdb4d","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/70","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":"4b857a17-abe3-424f-bade-5f61248fdb4d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/70","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":"4b857a17-abe3-424f-bade-5f61248fdb4d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/70 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/70"},{"claim":"The platform advertises $0.02 per request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/mortgages/70"}],"useCases":["Retrieving mortgage-related data or calculations on a per-request basis","Integrating mortgage information into agent workflows without managing API keys","Programmatic access to mortgage records settled via crypto micropayments"],"bestFor":["Developers or agents needing on-demand mortgage data with no subscription","x402-compatible agents that can pay per call with USDC on Base","Prototyping financial applications that need mortgage endpoints"],"notFor":["Users who need detailed documentation or guaranteed SLA before integrating","Bulk mortgage data retrieval (pay-per-request at $0.02 adds up 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"}}