{"id":"dfe2cc00-2c1e-4b26-94fb-4b0f5b0897c7","shortId":"d3eV5F","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 payment schedule for a specific loan (loan ID 34 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/34/schedule` accepts POST requests and returns JSON. Based on the x402 challenge, the cost is 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all endpoints, no API keys, no rate limits, and instant access. Payment is settled on-chain on Base to the specified payTo address.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive 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 live (returns a proper 402 challenge), but without documentation it is unclear what POST body is required or what the response structure looks like. The loan ID 34 is hardcoded in the URL, suggesting either a demo/sample loan or that callers must know valid loan IDs in advance.","tags":[],"capabilities":["loan-schedule","amortization","x402-payment","usdc-base","pay-per-request","json-api"],"categories":["finance"],"synonyms":["loan amortization schedule","payment schedule API","loan calculator","mortgage schedule","loan repayment plan","amortization table","x402 finance API"],"warnings":["No documentation available — all doc/pricing/API pages render only 'Connect wallet' with no content","No request body schema or response schema documented; callers must guess the POST payload","Loan ID 34 is hardcoded in the URL with no explanation of how to discover valid loan IDs","No OpenAPI specification or example requests/responses provided by the provider"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/34/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/34/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 34 represents. Docs pages are empty. No OpenAPI spec or examples exist. This is effectively a stub 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'/request':124 '0.02':112,123 '000':104 '0x8335':109 '20':103 '34':42,224 '402':201 '6':117 'accept':89 'access':137 'across':126 'address':150 'advanc':244 'advertis':121 'ai/ml':65 'amort':2,15 'amortization' 'amortization table' 'analyt':64 'api':4,17,61,130,157 'base':12,25,81,95,105,145 'behind':74 'bodi':211 'broader':52 'call':60 'caller':237 'chain':143 'challeng':99,202 'connect':166 'content':172 'cost':101 'crypto':68 'data':63 'decim':118 'demo/sample':233 'descript':183 'doc':156 'document':151,205 'dozen':55 'either':231 'endpoint':28,87,128,190,195 'equal':111 'exampl':180 'expect':191 'extrem':153 'field':186 'financ':67 'gate':73 'hardcod':226 'id':41,223,242 'infer':66 'instant':136 'json':94 'json-api' 'key':131 'know':239 'like':220 'limit':134 'live':197 'loan':1,14,33,39,40,188,222,234,241 'loan amortization schedule' 'loan calculator' 'loan repayment plan' 'loan-schedule' 'look':219 'lowpaymentfee.com':30 'mortgage schedule' 'must':238 'network':82 'offer':54 'on-chain':141 'openapi':176 'page':161 'part':49 'path':46 'pay':6,19,58 'pay-per-cal':57 'pay-per-request':5,18 'payment':34,77,138 'payment schedule API' 'payto':149 'per':7,20,59,113 'platform':53,120 'post':90,210 'price':125,158 'prompt':168 'proper':200 'protocol':78 'rate':133 'readm':160 'render':163 'request':8,21,91,114 'request/response':179 'requir':213 'respons':217 'return':31,93,193,198 'schedul':3,16,35,189 'schema':177 'servic':71 'settl':140 'span':62 'spars':154 'specif':38,86 'specifi':148 'structur':218 'substant':171 'suggest':230 'unclear':208 'uniform':122 'unit':106 'url':45,229 'usdc':13,26,84,108,115 'usdc-base' 'use':83,116 'util':70 'valid':240 'via':9,22 'wallet':167 'without':204 'x402':10,23,76,98 'x402 finance API' 'x402-payment'","prices":[{"id":"0d31ef41-5cde-4df3-9324-741539561575","listingId":"dfe2cc00-2c1e-4b26-94fb-4b0f5b0897c7","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/34/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":"2026-04-18T18:47:36.807Z"}],"sources":[{"listingId":"dfe2cc00-2c1e-4b26-94fb-4b0f5b0897c7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/34/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:36.807Z","lastSeenAt":"2026-04-29T09:35:01.587Z"}],"details":{"listingId":"dfe2cc00-2c1e-4b26-94fb-4b0f5b0897c7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/34/schedule \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/34/schedule"},{"claim":"Platform advertises $0.02/request pricing, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/34/schedule"}],"useCases":["Retrieve a payment schedule for a specific loan showing principal, interest, and balance over time","Integrate loan amortization data into financial dashboards or planning tools","Programmatic access to loan schedule data without API key management"],"bestFor":["Agents or apps needing on-demand loan schedule data with crypto micropayments","Developers who want key-free, pay-per-call financial APIs","Workflows requiring Base-network USDC settlement for API access"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","Production systems requiring SLA guarantees or support contracts","Scenarios where creating or managing loans (not just reading schedules) is needed"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.133Z"},"updatedAt":"2026-04-29T09:35:01.587Z"}}