{"id":"d96cbe68-d080-4542-b06b-5107d6078e1f","shortId":"3phBBY","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 21 in the URL path). It is part of a broader platform offering dozens of 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/21/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\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 spec, no request/response schema documentation, and no examples of what parameters the POST body should contain or what the schedule response looks like. The endpoint is live (returns a proper 402 challenge), but without documentation it is difficult to know what input fields are expected or what the output structure is. The loan schedule concept suggests it likely returns a table of periodic payments with principal, interest, and balance breakdowns, but this is inference only.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-base-network","pay-per-request","json-api"],"categories":["finance"],"synonyms":["amortization schedule","loan schedule","loan payment calculator","loan repayment schedule","payment breakdown","mortgage schedule","installment plan"],"warnings":["No API documentation available — /docs, /api, /pricing, /README all show only 'Connect wallet'","No OpenAPI spec or request/response schema provided","Endpoint path is hardcoded to loan ID 21; unclear if other loan IDs are supported or what they represent","Request body format is entirely unknown — no examples or field descriptions anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/21/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/21/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, and /README pages are empty beyond a wallet connect prompt. The loan schedule endpoint path is hardcoded to loan ID 21 with no explanation of what that represents. Effectively a stub 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'/api/v1/loans/21/schedule':88 '/docs':151 '/pricing':153 '/readme':155 '/request':129 '0.02':114,128 '000':104 '0x8335':109 '20':103 '21':42 '402':202 '6':119 'accept':89 'across':131 'advertis':98 'ai/ml':65 'amort':2,15,34 'amortization schedule' 'analyt':64 'api':4,17,61,136 'balanc':240 'base':12,25,81,105,111 'behind':74 'bodi':185 'breakdown':241 'broader':52 'call':60 'challeng':97,203 'commit':144 'concept':226 'confirm':126 'connect':161 'contain':187 'content':167 'cost':101 'crypto':68 'data':63 'decim':120 'difficult':209 'document':146,176,206 'dozen':55 'endpoint':28,87,133,196 'equal':113 'exampl':179 'expect':216 'extrem':148 'field':214 'financ':67 'gate':73 'id':41 'infer':66,245 'input':213 'installment plan' 'interest':238 'json':94 'json-api' 'key':137 'know':211 'land':124 'like':194,229 'limit':140 'live':198 'loan':1,14,33,39,40,224 'loan payment calculator' 'loan repayment schedule' 'loan schedule' 'loan-amortization-schedule' 'look':193 'lowpaymentfee.com':30 'maximum':100 'minimum':143 'mortgage schedule' 'network':82 'offer':54 'openapi':171 'output':220 'page':125,156 'paramet':182 'part':49 'path':46 'pay':6,19,58 'pay-per-cal':57 'pay-per-request':5,18 'payment':77,235 'payment breakdown' 'per':7,20,59,115 'period':234 'platform':53,122 'post':90,184 'price':130 'princip':237 'prompt':163 'proper':201 'protocol':78 'rate':139 'render':158 'request':8,21,91,116 'request/response':174 'requir':145 'respons':192 'return':31,93,199,230 'schedul':3,16,35,191,225 'schema':175 'servic':71 'span':62 'spars':149 'spec':172 'specif':38,86 'structur':221 'suggest':227 'tabl':232 'uniform':127 'unit':106 'url':45 'usdc':13,26,84,108,117 'usdc-base-network' 'use':83,118 'util':70 'via':9,22 'wallet':162 'without':205 'x402':10,23,76,96 'x402-payment'","prices":[{"id":"e83021ef-1568-4686-9911-389cba189b56","listingId":"d96cbe68-d080-4542-b06b-5107d6078e1f","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/21/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":"2026-04-18T18:47:27.700Z"}],"sources":[{"listingId":"d96cbe68-d080-4542-b06b-5107d6078e1f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/21/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:27.700Z","lastSeenAt":"2026-04-29T11:05:20.158Z"}],"details":{"listingId":"d96cbe68-d080-4542-b06b-5107d6078e1f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/21/schedule \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/21/schedule"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/21/schedule"}],"useCases":["Generating an amortization schedule for a loan to see payment breakdowns over time","Integrating loan schedule data into a financial planning application","Agent-driven loan analysis where per-call payment avoids subscription overhead"],"bestFor":["Developers needing on-demand loan schedule calculations without API key management","AI agents that can pay per-request via x402 for financial computations","Applications requiring simple pay-as-you-go access to loan math"],"notFor":["Users who need detailed API documentation before integrating","High-volume batch processing where $0.02/request adds up significantly","Anyone without a Base-network USDC wallet for x402 payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.608Z"},"updatedAt":"2026-04-29T11:05:20.158Z"}}