{"id":"95e79c92-0b51-4621-9dcc-e5908c4d4c48","shortId":"ppn8gn","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 given loan (identified by ID 50 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/50/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 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, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The loan schedule endpoint is not listed on the homepage's catalog of available APIs, which raises questions about whether it is a fully supported production endpoint or a demo/test route. Without documentation on what request body fields are expected or what the response structure looks like, integration requires experimentation.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-base-network","pay-per-request","json-api"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","loan repayment plan","mortgage schedule API","loan calculator"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.","The /api/v1/loans/50/schedule endpoint is not listed on the provider's homepage catalog of available APIs.","No request body schema or response schema is documented or discoverable.","Unknown whether the loan ID '50' in the path is a fixed demo or a parameterizable resource."],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/50/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/50/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 captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific loans endpoint is not listed in the site's own catalog. Effectively a stub 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'/api/v1/loans/50/schedule':89 '/docs':154 '/pricing':155 '/readme':158 '/request':131 '0.02':115,130 '000':105 '0x8335':110 '20':104 '50':43 '6':120 'accept':90 'across':134 'advertis':99 'ai/ml':66 'amort':2,15,34 'amortization calculator' 'analyt':65 'api':4,17,62,139,202 'avail':183,201 'base':12,25,82,106,112 'behind':75 'bodi':224 'broader':53 'call':61 'catalog':199 'challeng':98 'commit':147 'confirm':127 'connect':164 'content':170 'cost':102 'crawl':186 'crypto':69 'data':64 'decim':121 'demo/test':217 'document':149,220 'dozen':56 'endpoint':28,88,136,191,214 'equal':114 'exampl':182 'expect':227 'experiment':237 'extrem':151 'field':225 'financ':68 'flat':129 'fulli':211 'gate':74 'given':38 'homepag':197 'id':42 'identifi':40 'infer':67 'integr':235 'json':95 'json-api' 'key':140 'land':125 'like':234 'limit':143 'list':194 'loan':1,14,33,39,189 'loan calculator' 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'look':233 'lowpaymentfee.com':30 'materi':187 'maximum':101 'minimum':146 'model':133 'mortgage schedule API' 'network':83 'offer':55 'openapi':174 'page':126,159 'part':50 'path':47 'pay':6,19,59 'pay-per-cal':58 'pay-per-request':5,18 'payment':78 'per':7,20,60,116 'platform':54,123 'post':91 'price':132 'product':213 'prompt':166 'protocol':79 'question':205 'rais':204 'rate':142 'render':161 'request':8,21,92,117,223 'request/response':177 'requir':148,236 'respons':231 'return':31,94 'rout':218 'schedul':3,16,35,190 'schema':178 'servic':72 'span':63 'spars':152 'spec':175 'specif':87 'structur':232 'support':212 'unit':107 'url':46 'usag':181 'usdc':13,26,85,109,118 'usdc-base-network' 'use':84,119 'util':71 'via':9,22 'wallet':165 'whether':207 'without':219 'x402':10,23,77,97 'x402-payment'","prices":[{"id":"9c75b9a1-9727-42fc-a446-97ed81eb12c0","listingId":"95e79c92-0b51-4621-9dcc-e5908c4d4c48","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/50/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":"2026-04-18T18:47:38.011Z"}],"sources":[{"listingId":"95e79c92-0b51-4621-9dcc-e5908c4d4c48","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/50/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:38.011Z","lastSeenAt":"2026-04-29T09:35:01.639Z"}],"details":{"listingId":"95e79c92-0b51-4621-9dcc-e5908c4d4c48","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/50/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 advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/50/schedule"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/50/schedule"}],"useCases":["Generating an amortization schedule for a specific loan to display payment breakdowns","Integrating loan schedule data into a financial planning tool or dashboard","Programmatically retrieving payment schedules for lending platform back-ends"],"bestFor":["Developers needing on-demand loan amortization data without API key management","Agents that can settle micropayments via x402/USDC on Base","Applications requiring simple per-call pricing with no subscription overhead"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Bulk loan portfolio analysis requiring thousands of calls (no documented rate limits but no guarantees either)","Non-crypto users who cannot settle payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.128Z"},"updatedAt":"2026-04-29T09:35:01.639Z"}}