{"id":"6fbe4590-89d4-4150-8c49-d12108f05370","shortId":"69cQ8h","kind":"x402","title":"Loan amortization schedule API, pay-per-call at $0.02 via USDC on Base.","tagline":"Loan amortization schedule API, pay-per-call at $0.02 via USDC on Base.","description":"This endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 38 in the URL path). It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance, and utility categories, all settled via the x402 protocol using USDC on the Base network.\n\nThe endpoint accepts POST requests and is gated by an x402 payment challenge. The maximum cost per call is 20,000 base units of USDC (which uses 6 decimals), equating to $0.02 per request. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base, with a timeout of 300 seconds. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\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 schema, no request/response examples, and no description of what input parameters the POST body expects or what the schedule response looks like. The loan ID (38) is hardcoded in the URL, and it is unclear whether other loan IDs are available or how loans are created. The endpoint is live (402 challenge confirmed), but without documentation it is difficult to use confidently.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-base","pay-per-request","financial-calculation"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","debt repayment schedule","loan calculator API","payment schedule API"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no content","No request or response schema provided; input parameters for the POST body are unknown","Loan ID 38 is hardcoded in the endpoint path; unclear how to access other loans or create new ones","The platform lists many API categories on its homepage but this specific endpoint (loans/schedule) is not listed among them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/38/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/38/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, but there is zero documentation on request parameters, response format, or what loan ID 38 represents. No OpenAPI schema, no examples, and all doc pages are empty. This is effectively a stub 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'000':102 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':121 '20':101 '300':128 '38':44,199 '402':224 '6':109 'accept':84 'access':138 'across':62 'address':120 'advertis':137 'ai/ml':65 'amort':2,16,36 'amortization calculator' 'analyt':64 'api':4,18,61,131,154 'avail':214 'base':14,28,80,103,123 'bodi':187 'broader':54 'call':8,22,99 'categori':69 'challeng':94,225 'confid':235 'confirm':226 'connect':163 'content':169 'cost':97 'crawl':152 'creat':219 'data':63 'debt repayment schedule' 'decim':110 'descript':180 'difficult':232 'doc':153 'document':147,229 'endpoint':30,83,221 'equat':111 'exampl':177 'expect':188 'extrem':149 'financ':66 'financial-calculation' 'gate':89 'grant':140 'hardcod':201 'header':146 'id':43,198,212 'input':183 'key':132 'like':195 'limit':135 'live':223 'loan':1,15,35,41,42,197,211,217 'loan calculator API' 'loan payment schedule' 'loan schedule' 'loan-amortization-schedule' 'look':194 'lowpaymentfee.com':32 'made':118 'maximum':96 'network':81 'offer':56 'openapi':173 'page':158 'paramet':184 'part':51 'path':48 'pay':6,20,58 'pay-per-cal':5,19 'pay-per-request':57 'payment':93,116,145 'payment schedule API' 'per':7,21,59,98,114 'platform':55 'post':85,186 'price':155 'prompt':165 'protocol':75 'pure':141 'rate':134 'readm':157 'request':60,86,115 'request/response':176 'respons':193 'return':33,160 'schedul':3,17,37,192 'schema':174 'second':129 'settl':71 'spars':150 'specif':40 'substant':168 'timeout':126 'unclear':208 'unit':104 'url':47,204 'usdc':12,26,77,106 'usdc-base' 'use':76,108,234 'util':68 'via':11,25,72 'wallet':164 'whether':209 'without':228 'x402':74,92,144 'x402-payment'","prices":[{"id":"2469950b-f065-4f87-9433-e94701ac4131","listingId":"6fbe4590-89d4-4150-8c49-d12108f05370","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/38/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":"2026-04-18T18:47:33.762Z"}],"sources":[{"listingId":"6fbe4590-89d4-4150-8c49-d12108f05370","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/38/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:33.762Z","lastSeenAt":"2026-04-29T10:34:59.866Z"}],"details":{"listingId":"6fbe4590-89d4-4150-8c49-d12108f05370","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/38/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","source_url":"https://lowpaymentfee.com/api/v1/loans/38/schedule"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/38/schedule"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (docs, api, pricing, README) all returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving an amortization schedule for a loan to see payment breakdowns over time","Integrating loan schedule data into a financial planning application","Agent-driven financial calculations requiring per-call payment without API keys"],"bestFor":["Developers needing on-demand loan amortization data without subscription commitments","AI agents that can settle micropayments via x402 on Base","Quick one-off loan schedule lookups at $0.02 per call"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","Bulk loan portfolio analysis requiring thousands of calls (no documented batch endpoint)","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.321Z"},"updatedAt":"2026-04-29T10:34:59.866Z"}}