{"id":"7a4fe6d2-49ff-4027-a0de-e40e1e0288ed","shortId":"Ju4XQE","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 the path `/api/v1/mortgages/94`. 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/94` accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract 0x8335…2913) using the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD — consistent with the platform's advertised flat $0.02/request pricing across all endpoints. No API keys, rate limits, or upfront commitments are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nNote that the endpoint path suggests a resource-specific mortgage record (ID 94), but no documentation explains the request body schema, available fields, or what mortgage data is returned. The platform's docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. Without an OpenAPI spec or example responses, the exact capabilities of this endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-on-base","pay-per-request","mortgage-data","json-response","post-method"],"categories":["finance"],"synonyms":["mortgage API","mortgage data endpoint","lowpaymentfee mortgage","x402 mortgage","USDC pay-per-call","Base network API","mortgage lookup","real estate data API"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no technical content","The endpoint path /mortgages/94 suggests a specific resource ID but no explanation of the data model exists","The platform lists many endpoint categories but /mortgages/ is not among the advertised categories on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/94","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/94","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of the specific /mortgages/94 path is unexplained. This is effectively a stub 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'/request':133 '0.02':123,132 '000':114 '0x8335':99 '20':113 '2913':100 '6':119 '94':175 'Base network API' 'USDC pay-per-call' 'accept':85 'access':32 'across':135 'advertis':130 'ai/ml':63 'amount':108 'analyt':62 'api':58,139 'attach':150 'avail':184 'base':5,18,79,97,115 'bodi':182 'broader':47 'call':57,111 'caller':148 'capabl':221 'commit':145 'connect':204 'consist':125 'contract':98 'crypto':66 'data':2,15,37,61,189 'decim':120 'detail':211 'doc':195 'document':178 'dozen':52 'endpoint':3,16,28,59,83,137,165,224 'equal':122 'exact':104,220 'exampl':217 'explain':179 'field':185 'financ':65 'flat':131 'gate':71 'header':155 'id':174 'infer':64 'json':90 'json-response' 'key':140 'limit':142 'lowpaymentfee mortgage' 'lowpaymentfee.com':30,49 'maximum':107 'mortgag':1,14,35,172,188 'mortgage API' 'mortgage data endpoint' 'mortgage lookup' 'mortgage-data' 'mortgage-rel':34 'network':80 'note':162 'offer':51 'openapi':214 'page':199 'part':44 'path':40,166 'pay':7,20,55 'pay-per-cal':54 'pay-per-request':6,19 'payment':75,91,154,160 'per':8,21,56,110 'platform':48,128,193 'post':86 'post-method' 'price':134,196 'prompt':206 'proof':161 'protocol':76 'provid':31 'rate':141 'readm':198 'real estate data API' 'record':173 'relat':36 'remain':225 'render':201 'request':9,22,87,181 'requir':109,147 'resourc':170 'resource-specif':169 'respons':218 'return':89,191 'schema':183 'scheme':105 'servic':69 'settl':93 'simpli':149 'span':60 'spec':215 'specif':82,171 'suggest':167 'technic':210 'unclear':226 'unit':116 'upfront':144 'usd':124 'usdc':13,26,95,118 'usdc-on-base' 'use':101 'util':68 'valid':158 'via':10,23,72 'wallet':205 'without':212 'x':153 'x-payment':152 'x402':11,24,74,103,159 'x402 mortgage' 'x402-payment'","prices":[{"id":"0e066a8f-2623-4045-a92a-25619e32a657","listingId":"7a4fe6d2-49ff-4027-a0de-e40e1e0288ed","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:27.588Z"}],"sources":[{"listingId":"7a4fe6d2-49ff-4027-a0de-e40e1e0288ed","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/94","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:27.588Z","lastSeenAt":"2026-04-29T04:33:44.441Z"}],"details":{"listingId":"7a4fe6d2-49ff-4027-a0de-e40e1e0288ed","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/94 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","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 x402Version 1, exact scheme, USDC on Base, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/mortgages/94"},{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/94"}],"useCases":["Retrieving mortgage record data programmatically with per-call USDC payment","Integrating mortgage information into agent workflows without API key management","Accessing financial data via x402 micropayments on Base L2"],"bestFor":["Agents or apps that need on-demand mortgage data with no subscription","Developers experimenting with x402 pay-per-call protocols","Crypto-native workflows that can settle USDC on Base"],"notFor":["Users who need detailed documentation or guaranteed SLA before integrating","Bulk mortgage data retrieval where per-call pricing would be expensive","Non-crypto users who cannot generate x402 payment proofs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.674Z"},"updatedAt":"2026-04-29T04:33:44.441Z"}}