{"id":"6b210254-4401-41ef-b115-f7a3cfd5353a","shortId":"AK6z2X","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 86) via a POST request. 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 through the x402 protocol on the Base network using USDC.\n\nThe x402 challenge confirms the endpoint is live and accepts payments of up to $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The response MIME type is application/json.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no description of request parameters, and no example responses. The specific endpoint path suggests it returns a payment schedule for loan 86, but the request body schema and response structure are entirely unknown. The platform advertises uniform $0.02 pricing across all endpoints, no minimums, and no commitments.","tags":[],"capabilities":["loan-schedule","amortization","pay-per-request","x402-payment","usdc-base-network","json-api"],"categories":["finance"],"synonyms":["loan amortization schedule","loan payment schedule","loan calculator API","amortization table","loan repayment plan","payment schedule API"],"warnings":["No API documentation available — docs, pricing, and README pages all render only a wallet-connect prompt with no content.","No request body schema or response schema documented; callers must guess at the expected input.","Endpoint is hardcoded to loan ID 86 — unclear if other loan IDs are supported or how loans are created.","No OpenAPI specification or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/86/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/86/schedule","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear at $0.02/request in USDC on Base. However, there is no OpenAPI schema, no request/response documentation, no examples, and the endpoint is scoped to a single hardcoded loan ID with no explanation of what parameters it accepts. This is effectively a stub 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'000':101 '20':100 '6':107 '86':42,187 'accept':92 'across':205 'addit':159 'advertis':201 'ai/ml':64 'amort':2,15,34 'amortization' 'amortization table' 'analyt':63 'api':4,17,60,111,145 'application/json':137 'attach':120 'base':12,25,79,102 'bodi':191 'broader':52 'call':59 'caller':118 'challeng':85 'commit':212 'confirm':86 'connect':154 'content':160 'crawl':143 'crypto':67 'data':62 'decim':108 'descript':167 'doc':144 'document':138 'endpoint':28,88,177,207 'entir':197 'exampl':173 'extrem':140 'financ':66 'header':125 'id':41 'infer':65 'json-api' 'key':112 'limit':115 'live':90 'loan':1,14,33,39,40,186 'loan amortization schedule' 'loan calculator API' 'loan payment schedule' 'loan repayment plan' 'loan-schedule' 'lowpaymentfee.com':30 'mime':134 'minimum':209 'network':80 'offer':54 'openapi':164 'page':149 'paramet':170 'part':49 'path':178 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payment':93,124,130,183 'payment schedule API' 'per':7,20,58,98 'platform':53,200 'post':45 'price':146,204 'prompt':156 'proof':131 'protocol':76 'rate':114 'readm':148 'render':151 'request':8,21,46,99,169,190 'requir':117 'respons':133,174,194 'return':31,181 'schedul':3,16,35,184 'schema':165,192 'servic':70 'settl':72 'simpli':119 'span':61 'spars':141 'specif':38,176 'structur':195 'suggest':179 'type':135 'uniform':202 'unit':103 'unknown':198 'usdc':13,26,82,105 'usdc-base-network' 'use':81 'util':69 'valid':128 'various':55 'via':9,22,43 'wallet':155 'x':123 'x-payment':122 'x402':10,23,75,84,129 'x402-payment'","prices":[{"id":"9a9fb27d-daca-4714-9440-68bcb6a2fd98","listingId":"6b210254-4401-41ef-b115-f7a3cfd5353a","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/86/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":"2026-04-18T18:48:00.873Z"}],"sources":[{"listingId":"6b210254-4401-41ef-b115-f7a3cfd5353a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/86/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:00.873Z","lastSeenAt":"2026-04-29T06:34:07.451Z"}],"details":{"listingId":"6b210254-4401-41ef-b115-f7a3cfd5353a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/86/schedule \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/86/schedule"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/loans/86/schedule"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a loan amortization schedule showing principal and interest breakdowns per period","Integrating loan payment schedule data into financial planning tools","Agent-driven loan analysis workflows that need structured repayment data"],"bestFor":["Developers needing quick, keyless access to loan schedule data","AI agents that can pay per-call via x402 without pre-registration","Prototyping financial applications with minimal setup"],"notFor":["Production systems requiring documented, stable API contracts with SLAs","Use cases needing custom loan parameters (the endpoint is hardcoded to loan ID 86)","Users who cannot transact on the Base network with USDC"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.928Z"},"updatedAt":"2026-04-29T06:34:07.451Z"}}