{"id":"093a573c-b23e-4ceb-9962-3264b82a93a9","shortId":"nGjH5c","kind":"x402","title":"Mortgage data API endpoint on Base, paid per-request via x402 with USDC.","tagline":"Mortgage data API endpoint on Base, paid per-request via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data (specifically resource ID 46) via an x402 micropayment protocol. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform hosts a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services, all priced at $0.02 per request. However, the specific mortgage endpoint (/api/v1/mortgages/46) is not listed on the site's public catalog, and no documentation describes its request body schema or response format. The endpoint is confirmed live (returns a proper 402 challenge), but the exact data it returns — whether a specific mortgage product, rate calculation, or dataset — is unknown from available materials. The description field in the x402 challenge simply reads \"Premium API Access,\" which is generic and uninformative.\n\nBecause there is no OpenAPI spec, no request/response examples, and no documentation for this specific endpoint, callers will need to experiment or contact the provider to understand the expected input and output. The platform's general pricing model ($0.02/request, no minimums, no commitments, Base network settlement) applies.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","mortgage-data","json-api","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC micropayment API","real estate finance API"],"warnings":["No documentation exists for /api/v1/mortgages/46 — the endpoint is not listed on the provider's public API catalog","No request body schema or response schema available; callers must guess or experiment","The description 'Premium API Access' is generic and does not describe the endpoint's actual function","The /docs, /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/46","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/46","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 402 challenge, but there is zero documentation for this specific mortgage endpoint — no schema, no examples, no description of what data it returns. The endpoint isn't even listed on the provider's own catalog page. This is effectively a stub 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'/request':246 '0.02':73,131,245 '000':77 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':67 '20':76 '402':168 '46':43 '6':81 'USDC micropayment API' 'accept':51 'access':34,201 'ai/ml':121 'analyt':120 'api':3,17,84,117,200 'appli':254 'attach':93 'avail':188 'base':6,20,62,78,251 'bodi':155 'broader':106 'calcul':182 'call':116 'caller':91,223 'catalog':148 'challeng':169,196 'commit':250 'confirm':163 'contact':229 'contract':66 'cost':71 'crypto':124 'data':2,16,39,119,173 'dataset':184 'decim':82 'describ':152 'descript':191 'document':151,218 'endpoint':4,18,30,50,138,161,222 'exact':172 'exampl':215 'expect':235 'experi':227 'field':192 'financ':123 'format':159 'general':242 'generic':204 'header':98 'home loan API' 'host':109 'howev':134 'id':42 'infer':122 'input':236 'json':56 'json-api' 'key':85 'limit':88 'list':142 'live':164 'lowpaymentfee' 'lowpaymentfee.com':32,107 'materi':189 'maximum':70 'micropay':47 'minimum':248 'model':244 'mortgag':1,15,37,137,179 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':36 'need':225 'network':63,252 'no-api-key' 'openapi':211 'output':238 'paid':7,21 'pay':114 'pay-per-cal':113 'payment':57,97,103 'per':9,23,74,115,132 'per-request':8,22 'per-request-billing' 'platform':108,240 'post':52 'premium':199 'price':129,243 'product':180 'proof':104 'proper':167 'protocol':48 'provid':33,231 'public':147 'rate':87,181 'read':198 'real estate finance API' 'relat':38 'request':10,24,53,75,133,154 'request/response':214 'requir':90 'resourc':41 'respons':158 'return':55,165,175 'schema':156 'servic':127 'settl':59 'settlement':253 'simpli':92,197 'site':145 'span':118 'spec':212 'specif':40,136,178,221 'understand':233 'uninform':206 'unit':79 'unknown':186 'usdc':14,28,65 'usdc-base' 'use':64 'util':126 'valid':101 'varieti':111 'via':11,25,44 'whether':176 'x':96 'x-payment':95 'x402':12,26,46,102,195 'x402 mortgage' 'x402-payment'","prices":[{"id":"468af4fd-9473-4e3e-ac0a-6a771dc6e2d6","listingId":"093a573c-b23e-4ceb-9962-3264b82a93a9","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:14.862Z"}],"sources":[{"listingId":"093a573c-b23e-4ceb-9962-3264b82a93a9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:14.862Z","lastSeenAt":"2026-04-29T05:34:22.142Z"}],"details":{"listingId":"093a573c-b23e-4ceb-9962-3264b82a93a9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/46 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/46"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/46"},{"claim":"The /api/v1/mortgages/46 endpoint is not listed in the provider's public API catalog","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving mortgage-related data or calculations programmatically","Integrating mortgage information into financial dashboards or agent workflows","Paying per-request for financial data without subscription commitments"],"bestFor":["Agents or apps needing on-demand mortgage data with crypto micropayments","Developers who want keyless, pay-per-call access to financial endpoints","x402-compatible clients on the Base network"],"notFor":["Users who need well-documented APIs with clear request/response schemas","Bulk mortgage data retrieval (no documented batch endpoints)","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.343Z"},"updatedAt":"2026-04-29T05:34:22.142Z"}}