{"id":"7e7ebf6d-92d5-44bd-8ae5-b43f98b355b4","shortId":"7DjNzU","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 95 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 endpoint accepts POST requests and returns JSON. Each call costs $0.02 in USDC (20,000 base units with 6 decimals) settled on-chain via the x402 \"exact\" payment scheme to a specified wallet address. There are no API keys, no rate limits, and no subscription commitments — payment is handled entirely through the X-PAYMENT header per the x402 protocol.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what input the POST body expects or what the schedule output looks like. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to use without experimentation.","tags":[],"capabilities":["loan-amortization-schedule","pay-per-request","x402-payment","usdc-settlement","base-network","json-api"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","mortgage schedule","loan repayment plan","payment breakdown","loan calculator API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all return only a wallet connect prompt","No request body schema or response schema documented; callers must guess the POST payload","The endpoint is hardcoded to loan ID 95 — unclear if other loan IDs are supported or how they are created","No OpenAPI or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/95/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/95/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 format, response schema, or what loan ID 95 represents. No OpenAPI spec, no examples, and all doc pages are empty. This is effectively a stub 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'/docs':152 '/pricing':154 '/readme':156 '0.02':95 '000':99 '20':98 '402':203 '6':103 '95':42 'accept':86 'address':119 'ai/ml':64 'amort':2,15,34 'amortization calculator' 'analyt':63 'api':4,17,60,123 'base':12,25,80,100 'base-network' 'behind':73 'bodi':186 'broader':52 'call':59,93 'chain':108 'challeng':204 'commit':131 'confirm':198 'connect':162 'content':168 'cost':94 'crawl':151 'crypto':67 'data':62 'decim':104 'difficult':212 'document':146,177,209 'endpoint':28,85,196 'entir':135 'exact':112 'exampl':180 'expect':187 'experiment':216 'extrem':148 'financ':66 'gate':72 'handl':134 'header':141 'id':41 'infer':65 'input':183 'json':91 'json-api' 'key':124 'lack':207 'like':194 'limit':127 'live':199 'loan':1,14,33,39,40 'loan calculator API' 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'look':193 'lowpaymentfee.com':30 'make':210 'mortgage schedule' 'network':81 'offer':54 'on-chain':106 'openapi':172 'output':192 'page':157 'part':49 'path':46 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payment':76,113,132,140 'payment breakdown' 'per':7,20,58,142 'platform':53 'post':87,185 'prompt':164 'proper':202 'protocol':77,145 'rate':126 'request':8,21,88 'request/response':175 'return':31,90,159,200 'schedul':3,16,35,191 'schema':176 'scheme':114 'servic':70 'settl':105 'span':61 'spars':149 'spec':173 'specif':38 'specifi':117 'subscript':130 'substant':167 'unit':101 'url':45 'usdc':13,26,83,97 'usdc-settlement' 'use':82,214 'util':69 'various':55 'via':9,22,109 'wallet':118,163 'without':215 'x':139 'x-payment':138 'x402':10,23,75,111,144 'x402-payment'","prices":[{"id":"79c34a40-a80a-4b75-936a-b00d54011197","listingId":"7e7ebf6d-92d5-44bd-8ae5-b43f98b355b4","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/95/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":"2026-04-18T18:48:04.548Z"}],"sources":[{"listingId":"7e7ebf6d-92d5-44bd-8ae5-b43f98b355b4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/95/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:04.548Z","lastSeenAt":"2026-04-29T06:34:07.578Z"}],"details":{"listingId":"7e7ebf6d-92d5-44bd-8ae5-b43f98b355b4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/95/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 a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/95/schedule"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/95/schedule"}],"useCases":["Retrieving an amortization schedule for a specific loan to display payment breakdowns","Integrating loan schedule data into financial planning tools or dashboards","Programmatic access to loan payment details for automated financial analysis"],"bestFor":["Agents or apps needing on-demand loan amortization data without API key management","Crypto-native workflows that can pay per call via x402 on Base","Low-volume or sporadic usage where $0.02/request is cost-effective"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","High-volume batch processing where per-request pricing adds up quickly","Non-crypto workflows that cannot handle x402 payment headers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.8Z"},"updatedAt":"2026-04-29T06:34:07.578Z"}}