{"id":"60b09ec9-f2e0-4ab0-b6dd-35e347821f5c","shortId":"EnLukP","kind":"x402","title":"Loan amortization schedule API, pay-per-call at $0.02 via USDC on Base.","tagline":"Loan amortization schedule API, pay-per-call at $0.02 via USDC on Base.","description":"This endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 5 in the URL path). It is part of a broader platform offering dozens of pay-per-request APIs 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/loans/5/schedule` accepts POST requests and returns JSON. Based on the x402 challenge, the maximum amount required per call is 20,000 base units of USDC (0x8335… on Base), which equals $0.02 USD (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all its APIs with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation is extremely sparse — the docs, pricing, API, 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 parameters the loan schedule endpoint expects or what fields it returns. The endpoint is live (returns a proper 402 challenge), but without documentation it is difficult to know what request body to send or what output to expect.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-settlement","base-network","pay-per-request","json-api"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","loan repayment plan","mortgage schedule","payment breakdown"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for the loan schedule endpoint","The endpoint path is hardcoded to loan ID 5; it is unclear whether other loan IDs are supported or how loans are created","Cannot verify what the endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/5/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/5/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 no documentation, no OpenAPI schema, no request/response examples, and the docs pages are empty. The loan schedule endpoint's expected input and output are entirely 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'/request':132 '0.02':10,24,121,131 '000':111 '0x8335':116 '20':110 '402':202 '5':44 '6':125 'accept':92 'across':134 'advertis':129 'ai/ml':67 'amort':2,16,36 'amortization calculator' 'amount':105 'analyt':66 'api':4,18,63,137,140,156 'base':14,28,86,98,112,118 'base-network' 'bodi':214 'broader':54 'call':8,22,108 'challeng':102,203 'commit':148 'connect':164 'content':170 'crypto':70 'data':65 'decim':126 'descript':181 'difficult':209 'doc':154 'document':149,206 'dozen':57 'endpoint':30,75,90,188,196 'equal':120 'exampl':178 'expect':189,221 'extrem':151 'field':192 'financ':69 'id':43 'infer':68 'json':97 'json-api' 'key':141 'know':211 'limit':144 'live':198 'loan':1,15,35,41,42,186 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':32 'maximum':104 'minimum':147 'mortgage schedule' 'network':87 'offer':56 'openapi':174 'output':219 'page':159 'paramet':184 'part':51 'path':48 'pay':6,20,60 'pay-per-cal':5,19 'pay-per-request':59 'payment':79 'payment breakdown' 'per':7,21,61,107 'platform':55,128 'post':93 'price':133,155 'prompt':166 'proper':201 'protocol':80 'rate':143 'readm':158 'render':161 'request':62,94,213 'request/response':177 'requir':106 'return':33,96,194,199 'schedul':3,17,37,187 'schema':175 'send':216 'servic':73 'settl':81 'span':64 'spars':152 'specif':40,89 'uniform':130 'unit':113 'url':47 'usd':122 'usdc':12,26,83,115,123 'usdc-settlement' 'use':76,124 'util':72 'via':11,25 'wallet':165 'without':205 'x402':78,101 'x402-payment'","prices":[{"id":"ecd5cf7a-13dc-4316-81d9-521b62b895d5","listingId":"60b09ec9-f2e0-4ab0-b6dd-35e347821f5c","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/5/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":"2026-04-18T18:47:31.340Z"}],"sources":[{"listingId":"60b09ec9-f2e0-4ab0-b6dd-35e347821f5c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/5/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:31.340Z","lastSeenAt":"2026-04-29T10:34:59.837Z"}],"details":{"listingId":"60b09ec9-f2e0-4ab0-b6dd-35e347821f5c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/5/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 endpoint returns HTTP 402 with an x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/5/schedule"},{"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 address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/5/schedule"}],"useCases":["Generating an amortization schedule for a loan to see principal and interest breakdowns per period","Integrating loan schedule data into a financial planning application","Agents autonomously fetching loan repayment details as part of a financial workflow"],"bestFor":["Developers needing on-demand loan amortization data without API key management","AI agents that can pay per request via x402/USDC on Base","Applications requiring simple, low-cost financial calculations"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume batch processing where $0.02 per call adds up significantly","Production systems requiring SLA guarantees or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.375Z"},"updatedAt":"2026-04-29T10:34:59.837Z"}}