{"id":"87d95923-8d86-4ee2-9b6f-75343b885dd3","shortId":"ghrEnz","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/97`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance, and utility services — all gated via the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/mortgages/97` 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 platform's uniform $0.02/request pricing displayed on its landing page. Payment is made inline via the X-PAYMENT header; no API keys, subscriptions, or rate limits are required.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no description of what the mortgages resource actually returns. The endpoint path suggests it retrieves or processes data for a specific mortgage record (ID 97), but the exact input parameters and response shape are unknown. The platform appears live and the 402 challenge is well-formed, but the lack of documentation makes integration speculative.","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 API documentation available — /docs, /pricing, /api, and /README all render only a wallet-connect prompt","No OpenAPI or JSON schema for request or response bodies","The specific resource '/api/v1/mortgages/97' is not listed on the landing page among advertised endpoints, so its purpose and data content are unknown","No examples of request parameters or response payloads available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/97","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, no documentation, and no indication of what the mortgages resource actually returns. This is effectively a stub 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'/api/v1/mortgages/97':41,85 '/docs':163 '/pricing':165 '/readme':167 '/request':128 '0.02':112,127 '000':101 '0x8335':106 '20':100 '2913':107 '402':231 '6':117 '97':214 'Base network API' 'USDC pay-per-call' 'accept':86 'access':32 'actual':197 'addit':178 'advertis':95 'ai/ml':63 'analyt':62 'api':59,146 'appear':227 'base':5,18,78,102,109 'beyond':155 'broader':47 'call':9,22 'challeng':94,232 'connect':173 'consist':121 'cost':98 'data':2,15,37,61,207 'decim':118 'descript':191 'detail':180 'display':130 'document':154,241 'endpoint':3,16,28,84,200 'equal':111 'exact':217 'extrem':160 'financ':65 'form':236 'gate':70 'header':144 'home loan API' 'id':213 'infer':64 'inlin':138 'input':218 'integr':243 'json':91 'json-api' 'key':147 'lack':239 'land':133,157 'limit':151 'live':228 'lowpaymentfee' 'lowpaymentfee.com':30,49 'made':137 'make':242 'maximum':97 'mortgag':1,14,35,195,211 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':79 'no-api-key' 'offer':51 'openapi':184 'page':134,158,168 'paramet':219 'part':44 'path':40,201 'pay':7,20,56 'pay-per-cal':6,19 'pay-per-request':55 'payment':74,135,143 'per':8,21,57,113 'platform':48,124,226 'post':87 'price':129 'process':206 'prompt':175 'protocol':75 'provid':31 'rate':150 'record':212 'relat':36 'render':170 'request':58,88,114 'request/response':187 'requir':153 'resourc':196 'respons':221 'retriev':204 'return':90,198 'schema':188 'servic':68 'shape':222 'span':60 'spars':161 'spec':185 'specif':83,210 'specul':244 'subscript':148 'suggest':202 'technic':179 'uniform':126 'unit':103 'unknown':224 'usdc':13,26,81,105,115 'usdc-base' 'use':80,116 'util':67 'varieti':53 'via':10,23,71,139 'wallet':174 'well':235 'well-form':234 'x':142 'x-payment':141 'x402':11,24,73,93 'x402 mortgage' 'x402-payment'","prices":[{"id":"cb15feb5-5408-4193-94a9-9e04fc44d67a","listingId":"87d95923-8d86-4ee2-9b6f-75343b885dd3","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:39.673Z"}],"sources":[{"listingId":"87d95923-8d86-4ee2-9b6f-75343b885dd3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:39.673Z","lastSeenAt":"2026-04-29T04:33:44.766Z"}],"details":{"listingId":"87d95923-8d86-4ee2-9b6f-75343b885dd3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/97 \\\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 advertises maxAmountRequired of 20000 base units of USDC on Base, equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/mortgages/97"},{"claim":"The platform advertises uniform $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/97"}],"useCases":["Retrieving mortgage record data programmatically with per-call USDC payment","Integrating mortgage information into financial dashboards or agent workflows","Demonstrating x402 pay-per-request protocol usage on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents needing on-demand mortgage data without API key management","Micro-payment use cases on the Base L2 network"],"notFor":["Production mortgage underwriting or compliance workflows (no documentation or schema guarantees)","Users who need detailed API documentation or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.214Z"},"updatedAt":"2026-04-29T04:33:44.766Z"}}