{"id":"4eedc183-5742-448a-ba33-efa1429e7e90","shortId":"rL5Yd4","kind":"x402","title":"Mortgage data API endpoint on Base, pay-per-call via x402 with USDC.","tagline":"Mortgage data API 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/49`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request 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/49` accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract 0x8335…2913) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each call. The payment timeout is 300 seconds.\n\nDocumentation beyond the landing page is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no explanation of what the `/mortgages/49` resource actually returns. The endpoint is live (returns a proper 402 challenge), but the exact request body format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","pay-per-request","json-api"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC API","pay-per-call finance"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' prompt with no technical content.","No OpenAPI or schema definition found; request body format and response structure are completely unknown.","The specific resource '/mortgages/49' is not listed on the landing page among the advertised endpoints, raising questions about its purpose and data content.","The platform lists many endpoint categories but provides no verifiable detail on any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/49","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/49","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 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no explanation of what the /mortgages/49 resource actually contains. The listing is effectively a stub with confirmed 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'/api/v1/mortgages/49':43,86 '/docs':155 '/mortgages/49':187 '/pricing':156 '/readme':159 '0.02':108 '000':112 '0x8335':101 '20':111 '2913':102 '300':144 '402':198 '6':116 'USDC API' 'accept':87 'access':34,129 'actual':189 'advertis':120 'ai/ml':65 'analyt':64 'api':3,17,60,122 'attach':132 'base':6,20,81,99,113 'base-network' 'beyond':147 'bodi':204 'broader':49 'call':10,24,139 'challeng':199 'connect':165 'contract':100 'cost':106 'crypto':68 'data':2,16,39,63 'decim':117 'detail':172 'document':146 'dozen':54 'endpoint':4,18,30,61,85,192 'exact':202 'explan':183 'extrem':152 'financ':67 'format':205 'gate':73 'header':136 'home loan API' 'infer':66 'instant':128 'json':92 'json-api' 'key':123 'land':149 'limit':126 'live':194 'lowpaymentfee' 'lowpaymentfee.com':32,51 'maximum':105 'mortgag':1,15,37 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':36 'network':82 'offer':53 'openapi':176 'page':150,160 'part':46 'path':42 'pay':8,22,57 'pay-per-cal':7,21 'pay-per-call finance' 'pay-per-request':56 'payment':77,93,135,141 'per':9,23,58,109 'platform':50,119 'post':88 'prompt':167 'proper':197 'protocol':78 'provid':33 'rate':125 'relat':38 'render':162 'request':59,89,110,203 'request/response':179 'resourc':188 'respons':207 'return':91,190,195 'schema':180 'second':145 'servic':71 'settl':95 'simpli':131 'span':62 'spars':153 'spec':177 'specif':84 'structur':208 'technic':171 'timeout':142 'unit':114 'unknown':210 'usdc':14,28,97 'usdc-settlement' 'util':70 'via':11,25,74 'wallet':166 'x402':12,26,76,134 'x402 mortgage' 'x402-payment'","prices":[{"id":"ff697582-802d-4dd8-b617-2df0bc458586","listingId":"4eedc183-5742-448a-ba33-efa1429e7e90","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:11.776Z"}],"sources":[{"listingId":"4eedc183-5742-448a-ba33-efa1429e7e90","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:11.776Z","lastSeenAt":"2026-04-29T05:34:22.045Z"}],"details":{"listingId":"4eedc183-5742-448a-ba33-efa1429e7e90","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/49 \\\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 endpoint returns a valid x402 402 challenge with USDC on Base, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/mortgages/49"},{"claim":"The platform advertises $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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/49"}],"useCases":["Retrieving mortgage-related data for a specific record (ID 49)","Integrating mortgage information into financial dashboards or agent workflows","Programmatic access to mortgage data without API key registration"],"bestFor":["Agents or apps needing on-demand mortgage data with crypto micropayments","Developers who want keyless, pay-per-use API access on Base","Prototyping x402 payment flows against a live endpoint"],"notFor":["Users who need comprehensive mortgage market datasets in bulk","Anyone requiring detailed API documentation or guaranteed SLAs","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.456Z"},"updatedAt":"2026-04-29T05:34:22.045Z"}}