{"id":"54f5df99-b300-43cc-9f5a-8ca1f03802be","shortId":"wFWSz4","kind":"x402","title":"Loan amortization schedule API on Base, pay $0.02 per request via x402 with USDC.","tagline":"Loan amortization schedule API on Base, pay $0.02 per request via x402 with USDC.","description":"This endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 65 in the URL path). It is part of a broader platform offering various pay-per-request APIs across data analytics, AI/ML, finance, and utility categories, all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact-payment scheme. The maximum amount required is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. There are no API keys, no rate limits, and no sign-up required — callers simply attach a valid x402 payment header to each request.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what fields the loan schedule endpoint expects or returns. The endpoint is confirmed live (402 challenge captured), but the actual functionality and input/output format must be inferred from the URL path alone.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"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 — all doc pages return only 'Connect wallet' with no content","No OpenAPI or input/output schema provided; request and response formats are unknown","The endpoint path contains a hardcoded loan ID (65); it is unclear whether other loan IDs are supported or how loans are created","No request or response examples available from any source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/65/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/65/schedule","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect prompt. The specific loan ID (65) hardcoded in the path raises questions about whether this is a general-purpose endpoint or a single fixed resource. Effectively a stub 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'000':114 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':119 '20':113 '402':204 '6':128 '65':44 'accept':85 'across':63 'actual':209 'addit':176 'ai/ml':66 'alon':221 'amort':2,16,36 'amortization calculator' 'amount':110 'analyt':65 'api':4,18,62,133,162 'attach':146 'base':6,20,79,115,121 'base-network' 'broader':54 'caller':144 'captur':206 'categori':70 'challeng':205 'confirm':202 'connect':171 'content':177 'crawl':160 'data':64 'decim':129 'descript':188 'doc':161 'document':155 'endpoint':30,84,195,200 'equal':123 'exact':105 'exact-pay':104 'exampl':185 'expect':196 'extrem':157 'field':191 'financ':67 'format':213 'function':210 'given':125 'handl':93 'header':100,151 'id':43 'infer':216 'inlin':94 'input/output':212 'json':90 'json-response' 'key':134 'limit':137 'live':203 'loan':1,15,35,41,42,193 'loan calculator API' 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':32 'maximum':109 'mortgage schedule' 'must':214 'network':80 'no-api-key' 'offer':56 'openapi':181 'page':166 'part':51 'path':48,220 'pay':7,21,59 'pay-per-request':58 'payment':91,99,106,150 'payment breakdown' 'per':9,23,60 'platform':55 'post':86 'price':163 'prompt':173 'protocol':76 'rate':136 'readm':165 'request':10,24,61,87,154 'request/response':184 'requir':111,143 'return':33,89,168,198 'schedul':3,17,37,194 'schema':182 'scheme':107 'settl':72 'sign':141 'sign-up':140 'simpli':145 'spars':158 'specif':40 'unit':116 'url':47,219 'usdc':14,28,82,118,126 'usdc-settlement' 'use':81,101 'util':69 'valid':148 'various':57 'via':11,25,73,95 'wallet':172 'x':98 'x-payment':97 'x402':12,26,75,103,149 'x402-payment'","prices":[{"id":"a6c2da7b-1b42-4a42-ae1a-4bdb15e6a282","listingId":"54f5df99-b300-43cc-9f5a-8ca1f03802be","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/65/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":"2026-04-18T18:47:53.694Z"}],"sources":[{"listingId":"54f5df99-b300-43cc-9f5a-8ca1f03802be","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/65/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:53.694Z","lastSeenAt":"2026-04-29T07:34:32.298Z"}],"details":{"listingId":"54f5df99-b300-43cc-9f5a-8ca1f03802be","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/65/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 of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/65/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/65/schedule"}],"useCases":["Retrieve a detailed amortization schedule for a loan showing principal and interest breakdowns per period","Integrate loan payment schedule data into a fintech application without managing API keys","Programmatically access loan repayment information from an AI agent with inline micropayments"],"bestFor":["Agents or apps needing on-demand loan schedule data without subscription overhead","Developers building fintech tools who want frictionless pay-per-call pricing","x402-compatible clients on the Base network looking for low-cost financial APIs"],"notFor":["Users who need bulk or batch loan calculations at volume discounts","Anyone requiring detailed API documentation or guaranteed SLA before integration","Use cases requiring custom loan parameters if the endpoint only serves a fixed loan ID"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.332Z"},"updatedAt":"2026-04-29T07:34:32.298Z"}}