{"id":"68b2329e-1e58-4c04-926b-e0d1a060c69f","shortId":"wRDFfC","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 x402-enabled endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 3 in the URL path). It is part of a broader platform offering dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments.\n\nThe endpoint accepts POST requests and is gated by the x402 payment protocol. Callers must include an X-PAYMENT header containing a valid payment proof settled in USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout window.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual input parameters and response format for the loan schedule must be inferred from the endpoint path and description alone.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","loan repayment plan","mortgage schedule","payment breakdown"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; input parameters and output format are unknown","The endpoint path is hardcoded to loan ID 3 — unclear if other loan IDs are supported or how loans are created","The platform lists many API categories on its landing page but none have visible documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/3/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/3/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 with a valid x402 402 challenge, but there is zero documentation on request parameters, response schema, or what loan ID 3 represents. The /docs and other pages are empty beyond a wallet connect prompt. No OpenAPI spec or examples are available, making this effectively a stub 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'/docs':168 '/pricing':170 '/readme':172 '0.02':10,24,80,140 '000':134 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '20':133 '3':47 '300':155 '402':207 '6':144 'accept':95 'actual':211 'address':151 'ai/ml':70 'alon':230 'amort':2,16,39 'amortization calculator' 'amount':128 'analyt':69 'api':4,18,66,85 'avail':198 'base':14,28,124,135 'base-network' 'beyond':160 'broader':57 'call':8,22,131 'caller':106 'challeng':208 'commit':92 'confirm':202 'connect':178 'contain':114 'content':184 'crypto':73 'data':68 'decim':145 'descript':229 'document':159,193 'dozen':60 'enabl':32 'endpoint':33,94,200,226 'exampl':196 'extrem':165 'financ':72 'format':216 'gate':100 'header':113 'i.e':139 'id':46 'includ':108 'infer':71,223 'input':212 'key':86 'land':162 'limit':89 'live':203 'loan':1,15,38,44,45,219 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':35 'maximum':127 'mortgage schedule' 'must':107,221 'network':125 'no-api-key' 'offer':59 'openapi':188 'page':163,173 'paramet':213 'part':54 'path':51,227 'pay':6,20,63 'pay-per-cal':5,19 'pay-per-request':62 'payload':197 'payment':104,112,117,147 'payment breakdown' 'per':7,21,64,81,130 'platform':58 'post':96 'price':78 'prompt':180 'proof':118 'proper':206 'protocol':105 'rate':88 'render':175 'request':65,82,97 'request/response':191 'requir':129 'respons':215 'return':36,204 'schedul':3,17,40,220 'schema':192 'second':156 'sent':149 'servic':76 'settl':119 'sinc':141 'span':67 'spars':166 'spec':189 'specif':43 'timeout':157 'unit':136 'url':50 'usdc':12,26,121,138,142 'usdc-settlement' 'use':143 'util':75 'valid':116 'via':11,25 'wallet':179 'window':158 'x':111 'x-payment':110 'x402':31,103 'x402-enabled':30 'x402-payment'","prices":[{"id":"e0f0bd2b-9852-4893-8b5d-99c526c4b477","listingId":"68b2329e-1e58-4c04-926b-e0d1a060c69f","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/3/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":"2026-04-18T18:47:43.979Z"}],"sources":[{"listingId":"68b2329e-1e58-4c04-926b-e0d1a060c69f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/3/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:43.979Z","lastSeenAt":"2026-04-29T09:09:04.487Z"}],"details":{"listingId":"68b2329e-1e58-4c04-926b-e0d1a060c69f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/3/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 a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/3/schedule"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Generating an amortization schedule for a loan to see payment breakdowns over time","Integrating loan schedule data into a financial planning application","Agents autonomously fetching loan repayment details without pre-registration"],"bestFor":["Developers needing on-demand loan schedule calculations without API key management","AI agents that can settle micropayments in USDC on Base","Applications requiring simple pay-per-use financial computation endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Bulk or high-volume loan processing where per-request fees add up","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.853Z"},"updatedAt":"2026-04-29T09:09:04.487Z"}}