{"id":"0be048ce-9bde-47c3-94ba-0d00371d89e9","shortId":"JQ5T2y","kind":"x402","title":"Loan amortization schedule endpoint, pay-per-request via x402 on Base (USDC).","tagline":"Loan amortization schedule endpoint, pay-per-request via x402 on Base (USDC).","description":"This x402-enabled endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 97 in the URL path). It accepts POST requests and responds with JSON. Payment is settled on the Base network using USDC at $0.02 per request via the x402 exact-payment scheme.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that advertises multiple API categories including data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities — all priced at $0.02 per call. The platform emphasizes no API keys, no rate limits, and instant access. However, the specific endpoint listed here (/api/v1/loans/97/schedule) is not explicitly documented on the site's landing page among the advertised APIs, so its exact input schema and response format are unknown.\n\nThe x402 challenge is live and returns a valid 402 response with USDC (contract 0x8335…2913 on Base) as the accepted asset. The maxAmountRequired is 20000 base units, which at 6 decimals equals $0.02. No OpenAPI spec, detailed docs, or example responses were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-base-network","pay-per-request","json-response"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","loan repayment plan","mortgage schedule","loan calculator API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/loans/97/schedule path is not listed among the site's advertised APIs — it may be an unlisted or test endpoint","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no substantive content","Request body schema is unknown — unclear what parameters the POST endpoint expects","The loan ID (97) is hardcoded in the URL; it is unclear whether other loan IDs are supported"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/97/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/97/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 (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documentation of request/response schemas, no examples, and the specific /loans/97/schedule path is not listed among the site's advertised APIs. The docs pages returned no content. This is effectively a stub 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'0.02':68,105,184 '0x8335':165 '20000':176 '2913':166 '402':160 '6':181 '97':45 'accept':51,171 'access':119 'advertis':88,139 'ai/ml':95 'among':137 'amort':2,15,37 'amortization calculator' 'analyt':94 'api':90,112,140,200 'asset':172 'base':12,25,63,168,177 'broader':84 'call':107 'categori':91 'challeng':153 'connect':209 'content':215 'contract':164 'crawl':197 'data':93 'decim':182 'detail':188 'doc':189,199 'document':130 'emphas':110 'enabl':30 'endpoint':4,17,31,79,123 'equal':183 'exact':75,143 'exact-pay':74 'exampl':191 'explicit':129 'financ':97 'format':148 'found':194 'howev':120 'id':44 'includ':92 'infer':96 'infrastructur':100 'input':144 'instant':118 'json':57 'json-response' 'key':113 'land':135 'limit':116 'list':124 'live':155 'loan':1,14,36,42,43 'loan calculator API' 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':33,86 'maxamountrequir':174 'mortgage schedule' 'multipl':89 'network':64 'openapi':186 'page':136,204 'part':81 'path':49 'pay':6,19 'pay-per-request':5,18 'payment':58,76 'per':7,20,69,106 'platform':85,109 'post':52 'price':103,201 'prompt':211 'rate':115 'readm':203 'request':8,21,53,70 'respond':55 'respons':147,161,192 'return':34,157,206 'schedul':3,16,38 'schema':145 'scheme':77 'settl':60 'site':133 'spec':187 'specif':41,122 'substant':214 'unit':178 'unknown':150 'url':48 'usdc':13,26,66,163 'usdc-base-network' 'use':65 'util':101 'valid':159 'via':9,22,71 'wallet':210 'web3':98 'x402':10,23,29,73,152 'x402-enabled':28 'x402-payment'","prices":[{"id":"5cae9276-5ae0-4d93-aa84-bb4ba9b4996e","listingId":"0be048ce-9bde-47c3-94ba-0d00371d89e9","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/97/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":"2026-04-18T18:48:01.543Z"}],"sources":[{"listingId":"0be048ce-9bde-47c3-94ba-0d00371d89e9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/97/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:01.543Z","lastSeenAt":"2026-04-29T06:34:07.473Z"}],"details":{"listingId":"0be048ce-9bde-47c3-94ba-0d00371d89e9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/97/schedule \\\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 x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/97/schedule"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/97/schedule"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieve a loan amortization schedule showing principal and interest breakdowns per period","Integrate loan payment calculations into a financial planning application","Programmatically fetch repayment schedules for display in lending dashboards"],"bestFor":["Agents or apps needing on-demand loan schedule data without API key management","Developers building financial tools who want pay-per-call pricing","Crypto-native applications that can settle micropayments on Base"],"notFor":["Bulk batch processing of thousands of loan schedules (no documented batch endpoint)","Users who need detailed API documentation or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.926Z"},"updatedAt":"2026-04-29T06:34:07.473Z"}}