{"id":"bb4f11b3-d579-4a81-a94e-3db397ab6d2a","shortId":"SfN86t","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 (resource ID 41) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).\n\nThe provider, lowpaymentfee.com, hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. The specific `/api/v1/mortgages/41` endpoint is not listed on the provider's public landing page among the advertised categories, so its exact response schema and data contents are unclear. It may return mortgage rate information, loan details, or related financial data, but no documentation or example responses were found.\n\nThe endpoint is confirmed live: the probe received a proper HTTP 402 x402 challenge with version 1, scheme \"exact\", and a 300-second payment timeout. However, the lack of any OpenAPI spec, dedicated docs, or output schema beyond the basic HTTP/POST declaration means consumers must discover the response format empirically after payment.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-call","mortgage-data","json-response","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage rates","home loan data","mortgage information","real estate finance API","loan data endpoint","x402 mortgage"],"warnings":["The /api/v1/mortgages/41 endpoint is not listed on the provider's public landing page — its availability and data contents are unverified beyond the 402 challenge.","No OpenAPI spec, output schema, or example responses are available; consumers must discover the response format after payment.","Documentation pages (/docs, /api, /pricing, /README) all returned only a 'Connect wallet' prompt with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/41","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/41","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 challenge, but there is no documentation, no OpenAPI spec, no example responses, and the /mortgages/41 path is not listed among the provider's advertised APIs. The actual data returned is unknown, making this effectively a stub 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'0.02':70,105 '000':74 '0x8335':63 '1':183 '20':73 '2913':64 '300':188 '402':178 '41':40 '6':78 'accept':47 'access':32 'advertis':135 'ai/ml':96 'among':133 'analyt':95 'api':92,110 'base':5,18,58,75 'basic':206 'beyond':204 'broad':85 'call':9,22,91 'catalog':86 'categori':136 'challeng':180 'commit':118 'confirm':170 'consum':210 'content':144 'contract':62 'cost':68 'data':2,15,37,94,143,158 'decim':79 'declar':208 'dedic':199 'detail':154 'discov':212 'doc':200 'document':161 'empir':216 'endpoint':3,16,28,122,168 'exact':139,185 'exampl':163 'finance/web3':98 'financi':157 'format':215 'found':166 'home loan data' 'host':83 'howev':192 'http':177 'http/post':207 'id':39 'infer':97 'inform':152 'infrastructur':100 'json':52 'json-response' 'key':111 'lack':194 'land':131 'limit':114 'list':125 'live':171 'loan':153 'loan data endpoint' 'lowpaymentfee.com':30,82 'maximum':67 'may':148 'mean':209 'minimum':117 'mortgag':1,14,35,150 'mortgage API' 'mortgage information' 'mortgage rates' 'mortgage-data' 'mortgage-rel':34 'must':211 'network':59 'no-api-key' 'openapi':197 'output':202 'page':132 'pay':7,20,89 'pay-per-cal':6,19,88 'pay-per-call' 'payment':44,53,190,218 'per':8,21,71,90,106 'post':48 'price':103 'probe':173 'proper':176 'protocol':45 'provid':31,81,128 'public':130 'rate':113,151 'real estate finance API' 'receiv':174 'relat':36,156 'request':49,72,107 'resourc':38 'respons':140,164,214 'return':51,149 'schema':141,203 'scheme':184 'second':189 'settl':55 'span':93 'spec':198 'specif':120 'timeout':191 'unclear':146 'unit':76 'usdc':13,26,61 'usdc-base-network' 'use':60 'util':101 'version':182 'via':10,23,41 'x402':11,24,43,179 'x402 mortgage' 'x402-payment'","prices":[{"id":"21998e56-f80c-426c-9a14-3e0513fdbb81","listingId":"bb4f11b3-d579-4a81-a94e-3db397ab6d2a","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:10.568Z"}],"sources":[{"listingId":"bb4f11b3-d579-4a81-a94e-3db397ab6d2a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:10.568Z","lastSeenAt":"2026-04-29T05:34:22.020Z"}],"details":{"listingId":"bb4f11b3-d579-4a81-a94e-3db397ab6d2a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/41 \\\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":"Endpoint returns HTTP 402 with x402 version 1 challenge, scheme exact, on Base network using USDC","source_url":"https://lowpaymentfee.com/api/v1/mortgages/41"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/mortgages/41"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/41"}],"useCases":["Retrieving mortgage-related financial data programmatically","Integrating mortgage information into financial dashboards","Agent-driven lookups of mortgage details without API key management"],"bestFor":["Developers needing on-demand mortgage data without subscription commitments","AI agents that can settle x402 micropayments on Base","Applications requiring keyless, pay-per-use financial data access"],"notFor":["Users who need well-documented, schema-specified APIs before integrating","Bulk mortgage data retrieval (pay-per-call at $0.02 adds up at scale)","Non-crypto users who cannot settle USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.467Z"},"updatedAt":"2026-04-29T05:34:22.020Z"}}