{"id":"4a0289cd-bad7-46c3-85f7-42e674d32c0f","shortId":"HxH3Cc","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 at the path `/api/v1/mortgages/38`. 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 endpoints use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/mortgages/38` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). This matches the platform's uniform $0.02/request pricing displayed on the landing page. Payment is made via the x402 \"exact\" scheme to the specified wallet address, with a 300-second timeout window.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the mortgages endpoint actually returns (e.g., whether ID 38 refers to a specific mortgage product, rate data, or calculation). The endpoint is confirmed live via the 402 challenge, but the actual payload structure and data content remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","per-request-pricing","json-response"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","mortgage rates","home loan API","lowpaymentfee","x402 mortgage","USDC pay-per-call","Base network API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for request or response payloads","Unknown what data the /api/v1/mortgages/38 endpoint actually returns","The endpoint path suggests a specific resource (ID 38) but no context is provided for what that ID represents","This endpoint is not listed on the provider's landing page among their advertised APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/38","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC per request). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the mortgages/38 endpoint actually returns. This is effectively a stub 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'/request':126 '0.02':110,125 '000':105 '20':104 '300':148 '38':195 '402':213 '6':117 'Base network API' 'USDC pay-per-call' 'accept':90 'access':34 'actual':190,217 'address':145 'advertis':99 'ai/ml':65 'analyt':64 'api':3,17,60,158 'base':6,20,84,106 'base-network' 'broader':49 'calcul':205 'call':59 'challeng':98,214 'confirm':209 'connect':167 'content':173,222 'cost':102 'crypto':68 'data':2,16,39,63,203,221 'decim':118 'descript':184 'display':128 'doc':157 'document':152 'dozen':54 'e.g':192 'endpoint':4,18,30,61,73,88,189,207 'exact':139 'exampl':181 'extrem':154 'financ':67 'home loan API' 'id':194 'infer':66 'json':95 'json-response' 'land':131 'live':210 'lowpaymentfee' 'lowpaymentfee.com':32,51 'made':135 'match':120 'maximum':101 'mortgag':1,15,37,188,200 'mortgage API' 'mortgage data' 'mortgage rates' 'mortgage-data' 'mortgage-rel':36 'network':85 'offer':53 'openapi':177 'page':132,162 'paid':7,21 'part':46 'path':42 'pay':57 'pay-per-cal':56 'payload':218 'payment':77,133 'per':9,23,58,112 'per-request':8,22 'per-request-pricing' 'platform':50,122 'post':91 'price':127,159 'product':201 'prompt':169 'protocol':78 'provid':33 'rate':202 'readm':161 'refer':196 'relat':38 'remain':223 'render':164 'request':10,24,92,113 'request/response':180 'return':94,191 'schema':178 'scheme':140 'second':149 'servic':71 'settl':79 'sinc':114 'span':62 'spars':155 'specif':87,199 'specifi':143 'structur':219 'timeout':150 'uniform':124 'unit':107 'unknown':224 'usd':111 'usdc':14,28,81,109,115 'usdc-settlement' 'use':74,116 'util':70 'via':11,25,136,211 'wallet':144,168 'whether':193 'window':151 'x402':12,26,76,97,138 'x402 mortgage' 'x402-payment'","prices":[{"id":"13e18b2e-3c91-4dbe-bdc3-169f9e7b22ac","listingId":"4a0289cd-bad7-46c3-85f7-42e674d32c0f","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:16.080Z"}],"sources":[{"listingId":"4a0289cd-bad7-46c3-85f7-42e674d32c0f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:16.080Z","lastSeenAt":"2026-04-29T05:34:22.166Z"}],"details":{"listingId":"4a0289cd-bad7-46c3-85f7-42e674d32c0f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/38 \\\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 402 challenge with x402Version 1, exact scheme, USDC on Base network, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/mortgages/38"},{"claim":"Platform pricing is $0.02 per request 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/38"}],"useCases":["Retrieving mortgage-related data programmatically with per-call USDC payment","Integrating mortgage information into financial dashboards or agent workflows","Accessing on-demand mortgage data without API keys or subscriptions"],"bestFor":["Agents or apps needing on-demand mortgage data with crypto micropayments","Developers who want keyless, pay-per-use API access on Base","Quick one-off mortgage data lookups without subscription commitments"],"notFor":["Users needing detailed documentation or well-defined schemas before integration","High-volume mortgage data consumers who need bulk pricing or rate limits guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.332Z"},"updatedAt":"2026-04-29T05:34:22.166Z"}}