{"id":"4852c0af-dc4f-4d03-9d26-7c374c6825ee","shortId":"Y94E7y","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 60 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 settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/loans/60/schedule` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the docs, pricing, and API 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 POST body should contain or what fields the schedule response includes. The endpoint is live (returns a proper 402 challenge), but without documentation it is difficult to know the expected input format or output structure beyond the MIME type (application/json).","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","mortgage schedule","loan repayment plan","payment breakdown","debt amortization"],"warnings":["No API documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; input parameters for the POST body are unknown","The endpoint is hardcoded to loan ID 60 — it is unclear whether other loan IDs are supported or how loans are created","No examples of successful responses exist in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/60/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/60/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 purpose of the endpoint can only be inferred from the URL path. This is effectively a stub 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'/request':129 '0.02':113,128 '000':102 '0x8335':107 '20':101 '2913':108 '402':201 '6':118 '60':42 'accept':87 'across':132 'advertis':96 'ai/ml':64 'amort':2,15,34 'amortization calculator' 'analyt':63 'api':4,17,60,137,155 'application/json':222 'base':12,25,79,103,110 'base-network' 'beyond':218 'bodi':184 'broader':52 'call':59 'challeng':95,202 'commit':145 'confirm':125 'connect':161 'contain':186 'content':167 'cost':99 'crypto':67 'data':62 'debt amortization' 'decim':119 'descript':178 'difficult':208 'doc':152 'document':147,205 'endpoint':28,85,134,195 'equal':112 'exampl':175 'expect':212 'extrem':149 'field':189 'financ':66 'flat':127 'format':214 'id':41 'includ':193 'infer':65 'input':213 'json':92 'json-api' 'key':138 'know':210 'land':123 'limit':141 'live':197 'loan':1,14,33,39,40 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':30 'maximum':98 'mime':220 'minimum':144 'model':131 'mortgage schedule' 'network':80 'offer':54 'openapi':171 'output':216 'page':124,156 'paramet':181 'part':49 'path':46 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payment breakdown' 'per':7,20,58,114 'platform':53,121 'post':88,183 'price':130,153 'prompt':163 'proper':200 'protocol':76 'rate':140 'render':158 'request':8,21,89,115 'request/response':174 'requir':146 'respons':192 'return':31,91,198 'schedul':3,16,35,191 'schema':172 'servic':70 'settl':72 'span':61 'spars':150 'specif':38,84 'structur':217 'type':221 'unit':104 'url':45 'usdc':13,26,82,106,116 'usdc-settlement' 'use':81,117 'util':69 'various':55 'via':9,22,73 'wallet':162 'without':204 'x402':10,23,75,94 'x402-payment'","prices":[{"id":"b4f93eb6-33aa-46b5-a6bf-0186d024e530","listingId":"4852c0af-dc4f-4d03-9d26-7c374c6825ee","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/60/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":"2026-04-18T18:47:48.241Z"}],"sources":[{"listingId":"4852c0af-dc4f-4d03-9d26-7c374c6825ee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/60/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:48.241Z","lastSeenAt":"2026-04-29T08:05:48.662Z"}],"details":{"listingId":"4852c0af-dc4f-4d03-9d26-7c374c6825ee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/60/schedule \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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 maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/60/schedule"},{"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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/60/schedule"}],"useCases":["Generating an amortization schedule for a loan to see payment breakdowns over time","Integrating loan schedule data into a financial planning application","Agents autonomously fetching loan repayment details for advisory workflows"],"bestFor":["Developers needing on-demand loan amortization data via a simple API call","AI agents that can settle micropayments on Base to access financial calculations","Applications requiring no-signup, keyless access to loan schedule computations"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Production systems requiring guaranteed SLAs or support contracts","Bulk batch processing of thousands of loans (no documented batch endpoint)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.614Z"},"updatedAt":"2026-04-29T08:05:48.662Z"}}