{"id":"53d72f50-58a3-4902-8df6-1e5b9a94bd5e","shortId":"ZvHuBS","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 provides a loan amortization schedule for a specific loan (loan ID 57) via a POST request. It is part of a broader platform offering various pay-per-call APIs across data analytics, AI/ML, finance, and utility categories, all settled through the x402 payment protocol on the Base network using USDC.\n\nThe endpoint returns JSON (application/json) and costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is handled inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required. The x402 challenge was successfully captured, confirming the endpoint is live and accepting payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second payment timeout.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no description of request parameters, and no example responses. The endpoint path suggests it returns a payment schedule for loan 57, but the exact input format and output structure are unknown. The broader site advertises a uniform $0.02/request pricing model across all endpoints.","tags":[],"capabilities":["loan-schedule","amortization","x402-payment","usdc-settlement","base-network","pay-per-request","json-response"],"categories":["finance"],"synonyms":["loan amortization schedule","loan payment schedule","loan calculator","amortization table","loan repayment plan","payment schedule API"],"warnings":["No API documentation available — docs, pricing, and README pages all return only a wallet-connect prompt","No OpenAPI or request/response schema provided; input format and output structure are entirely unknown","Endpoint path is hardcoded to loan ID 57; unclear if this is parameterizable or a demo fixture","The broader site lists many endpoint categories but this specific loans endpoint is not listed on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/57/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/57/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), but there is no documentation, no request/response schema, no examples, and the endpoint is scoped to a single hardcoded loan ID (57) with no explanation of what parameters it accepts or what the response looks 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'0.02':89,208 '000':93 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '20':92 '300':139 '57':42,191 '6':99 'accept':132 'account':114 'across':61,212 'address':135 'advertis':205 'ai/ml':64 'amort':2,15,34 'amortization' 'amortization table' 'analyt':63 'api':4,17,60,112,150 'application/json':86 'base':12,25,78,94 'base-network' 'broader':52,203 'call':59 'captur':125 'categori':68 'challeng':122 'confirm':126 'connect':159 'content':165 'cost':88 'crawl':148 'data':62 'decim':100 'descript':172 'doc':149 'document':143 'endpoint':28,83,128,181,214 'exact':194 'exampl':178 'extrem':145 'financ':65 'format':196 'handl':103 'header':110 'id':41 'inlin':104 'input':195 'json':85 'json-response' 'key':113 'limit':117 'live':130 'loan':1,14,33,39,40,190 'loan amortization schedule' 'loan calculator' 'loan payment schedule' 'loan repayment plan' 'loan-schedule' 'lowpaymentfee.com':30 'model':211 'network':79 'offer':54 'openapi':169 'output':198 'page':154 'paramet':175 'part':49 'path':182 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payment':74,101,109,133,141,187 'payment schedule API' 'per':7,20,58,90 'platform':53 'post':45 'price':151,210 'prompt':161 'protocol':75 'provid':31 'rate':116 'readm':153 'request':8,21,46,91,174 'requir':119 'respons':179 'return':84,156,185 'schedul':3,16,35,188 'schema':170 'second':140 'settl':70 'site':204 'spars':146 'specif':38 'structur':199 'success':124 'suggest':183 'timeout':142 'uniform':207 'unit':95 'unknown':201 'usdc':13,26,81,97 'usdc-settlement' 'use':80 'util':67 'various':55 'via':9,22,43,105 'wallet':160 'x':108 'x-payment':107 'x402':10,23,73,121 'x402-payment'","prices":[{"id":"77af20f6-2000-4cf6-a2d9-d0f4cb932fcc","listingId":"53d72f50-58a3-4902-8df6-1e5b9a94bd5e","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/57/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":"2026-04-18T18:47:48.242Z"}],"sources":[{"listingId":"53d72f50-58a3-4902-8df6-1e5b9a94bd5e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/57/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:48.242Z","lastSeenAt":"2026-04-29T08:05:48.680Z"}],"details":{"listingId":"53d72f50-58a3-4902-8df6-1e5b9a94bd5e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/57/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":"Endpoint returns 402 with x402 challenge advertising USDC payment on Base network at 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/loans/57/schedule"},{"claim":"Site advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/57/schedule"}],"useCases":["Retrieving a loan amortization schedule showing principal and interest breakdowns per period","Integrating loan payment schedule data into financial planning tools","Agent-driven financial calculations that need on-demand loan schedule generation"],"bestFor":["Developers needing a simple pay-per-call loan schedule endpoint without API key management","AI agents that can settle USDC payments on Base for financial data","Quick one-off loan schedule lookups without subscription commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume batch loan calculations where per-request pricing adds up","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.56Z"},"updatedAt":"2026-04-29T08:05:48.680Z"}}