{"id":"a9db7642-01ae-4248-a09c-a33d518b95f8","shortId":"N63Xu3","kind":"x402","title":"Loan amortization schedule API, pay-per-request via x402 on Base (USDC).","tagline":"Loan amortization schedule API, pay-per-request via x402 on Base (USDC).","description":"This endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 93 in the URL path). It is part of a broader platform offering various pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/loans/93/schedule` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nWhile the endpoint is live and returns a valid 402 challenge, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the loan schedule contains or what input parameters the POST body expects. The loan-specific path (`/loans/93/schedule`) suggests this may be a demo or fixed-resource endpoint rather than a general-purpose loan calculator. Without documentation, the exact request format and response structure remain unknown.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-base-network","pay-per-request","json-api"],"categories":["finance"],"synonyms":["loan schedule","amortization table","loan payment schedule","loan calculator API","payment schedule API","x402 finance API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","Endpoint path references a specific loan ID (93); unclear if this is a demo or if other loan IDs are supported","No information on what POST body fields are expected"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/93/schedule","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/loans/93/schedule","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 with clear pricing, but there is zero documentation on request parameters or response schema. The docs/pricing/README pages are all empty beyond a wallet connect prompt. The loan-specific path (/loans/93) suggests a fixed resource rather than a general API, and no examples 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'/loans/93/schedule':209 '/request':128 '0.02':113,127 '000':103 '0x8335':108 '20':102 '402':154 '6':118 '93':42 'accept':88 'across':130 'advertis':97 'ai/ml':64 'amort':2,15,34 'amortization table' 'analyt':63 'api':4,17,60,135,162 'base':12,25,80,104,110 'behind':73 'bodi':202 'broader':52 'calcul':228 'call':59 'challeng':96,155 'commit':143 'confirm':125 'connect':171 'contain':195 'content':177 'cost':100 'crypto':67 'data':62 'decim':119 'demo':215 'descript':188 'doc':161 'document':156,230 'endpoint':28,86,132,147,220 'equal':112 'exact':232 'exampl':185 'expect':203 'extrem':158 'field':191 'financ':66 'fix':218 'fixed-resourc':217 'format':234 'gate':72 'general':225 'general-purpos':224 'id':41 'infer':65 'input':198 'json':93 'json-api' 'key':136 'land':123 'limit':139 'live':149 'loan':1,14,33,39,40,193,206,227 'loan calculator API' 'loan payment schedule' 'loan schedule' 'loan-amortization-schedule' 'loan-specif':205 'lowpaymentfee.com':30 'maximum':99 'may':212 'minimum':142 'network':81 'offer':54 'openapi':181 'page':124,166 'paramet':199 'part':49 'path':46,208 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payment':76 'payment schedule API' 'per':7,20,58,114 'platform':53,121 'post':89,201 'price':129,163 'prompt':173 'protocol':77 'purpos':226 'rate':138 'rather':221 'readm':165 'remain':238 'render':168 'request':8,21,90,115,233 'request/response':184 'requir':144 'resourc':219 'respons':236 'return':31,92,151 'schedul':3,16,35,194 'schema':182 'servic':70 'span':61 'spars':159 'specif':38,85,207 'structur':237 'substant':176 'suggest':210 'uniform':126 'unit':105 'unknown':239 'url':45 'usdc':13,26,83,107,116 'usdc-base-network' 'use':82,117 'util':69 'valid':153 'various':55 'via':9,22 'wallet':172 'without':229 'x402':10,23,75,95 'x402 finance API' 'x402-payment'","prices":[{"id":"e548ef3e-51b1-4d72-9a24-98a5168a7211","listingId":"a9db7642-01ae-4248-a09c-a33d518b95f8","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/loans/93/schedule","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:59.053Z"}],"sources":[{"listingId":"a9db7642-01ae-4248-a09c-a33d518b95f8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/93/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:59.053Z","lastSeenAt":"2026-04-29T06:34:07.354Z"}],"details":{"listingId":"a9db7642-01ae-4248-a09c-a33d518b95f8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/93/schedule \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform $0.02/request pricing, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/93/schedule"},{"claim":"USDC contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/93/schedule"}],"useCases":["Retrieving an amortization schedule for a specific loan","Integrating loan payment breakdowns into financial dashboards","Agent-driven loan analysis workflows that pay per call"],"bestFor":["Developers needing simple pay-per-call loan schedule data","AI agents with x402/USDC payment capability on Base","Prototyping financial tools without API key signup"],"notFor":["Production loan origination systems requiring documented, stable APIs","Users needing configurable loan parameters (no docs on input schema)","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.053Z"},"updatedAt":"2026-04-29T06:34:07.354Z"}}