{"id":"8a91e968-879c-4731-8af4-14dd2297c6ce","shortId":"rjuYe3","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 amortization schedule for a specific loan (loan ID 73 in the URL path). It is part of a broader platform offering various pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint is live and returns a 402 Payment Required challenge, indicating it accepts x402 payments of up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). The payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the USDC contract on Base (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The endpoint accepts POST requests and returns application/json.\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 contains or what input parameters the POST body expects. The endpoint path suggests it returns a payment schedule for a pre-existing loan resource (ID 73), but it is unclear whether this is a static resource or whether the POST body can parameterize the schedule calculation. The platform's landing page confirms a flat $0.02/request pricing model with no API keys, no rate limits, and instant access.","tags":[],"capabilities":["loan-schedule","amortization","pay-per-request","x402-payment","usdc-base","json-api"],"categories":["finance"],"synonyms":["loan amortization schedule","loan payment schedule","loan calculator API","amortization table","loan repayment API","payment schedule generator"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; input parameters for the POST body are unknown","Endpoint path is hardcoded to loan ID 73 — unclear if other loan IDs exist or how loans are created","The platform lists many API categories (AI, analytics, finance, etc.) but none have visible documentation, raising questions about maturity"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/73/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/73/schedule","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","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 OpenAPI schema, no request/response examples, and the endpoint path is hardcoded to a single loan ID with no explanation of input parameters. This is effectively a stub 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'0.02':102,117,234 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':124 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':131 '20':107 '402':90 '6':115 '73':42,205 'accept':96,134 'access':247 'address':123 'ai/ml':64 'amort':2,15,34 'amortization' 'amortization table' 'analyt':63 'api':4,17,60,146,240 'application/json':139 'base':12,25,79,109,130 'bodi':186,220 'broader':52 'calcul':225 'call':59 'challeng':93 'confirm':231 'connect':155 'contain':179 'content':161 'contract':128 'crypto':67 'data':62 'decim':116 'descript':172 'doc':145 'document':140 'endpoint':28,84,133,189 'exampl':169 'exist':201 'expect':187 'extrem':142 'field':175 'financ':66 'flat':233 'id':41,204 'indic':94 'infer':65 'input':182 'instant':246 'json-api' 'key':241 'land':229 'limit':244 'live':86 'loan':1,14,33,39,40,177,202 'loan amortization schedule' 'loan calculator API' 'loan payment schedule' 'loan repayment API' 'loan-schedule' 'lowpaymentfee.com':30 'made':121 'maxamountrequir':105 'model':237 'network':80 'offer':54 'openapi':165 'page':150,230 'paramet':183 'parameter':222 'part':49 'path':46,190 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payment':91,98,119,195 'payment schedule generator' 'per':7,20,58,103 'platform':53,227 'post':135,185,219 'pre':200 'pre-exist':199 'price':147,236 'prompt':157 'protocol':76 'rate':243 'readm':149 'render':152 'request':8,21,104,136 'request/response':168 'requir':92 'resourc':203,215 'return':31,88,138,193 'schedul':3,16,35,178,196,224 'schema':166 'servic':70 'settl':72 'span':61 'spars':143 'specif':38 'static':214 'substant':160 'suggest':191 'unclear':209 'unit':110 'url':45 'usdc':13,26,82,112,127 'usdc-base' 'use':81,125 'util':69 'various':55 'via':9,22,73 'wallet':156 'whether':210,217 'x402':10,23,75,97 'x402-payment'","prices":[{"id":"78c29ae2-68b5-4706-b4e1-a401160ccf0f","listingId":"8a91e968-879c-4731-8af4-14dd2297c6ce","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/73/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":"2026-04-18T18:47:43.357Z"}],"sources":[{"listingId":"8a91e968-879c-4731-8af4-14dd2297c6ce","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/73/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:43.357Z","lastSeenAt":"2026-04-29T09:09:04.554Z"}],"details":{"listingId":"8a91e968-879c-4731-8af4-14dd2297c6ce","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/73/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 accepting USDC on Base, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/loans/73/schedule"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/73/schedule"}],"useCases":["Retrieve a loan amortization schedule showing principal and interest breakdowns per period","Integrate loan payment schedule data into financial planning tools","Automate loan analysis workflows with per-call micropayments"],"bestFor":["Agents or apps needing on-demand loan schedule data without API key management","Developers who want to pay per request with crypto (USDC on Base)","Quick prototyping of financial tools without subscription commitments"],"notFor":["Production use cases requiring documented request/response schemas and SLAs","Users who need to create or manage loans (this appears to be read-only for a fixed loan ID)","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.761Z"},"updatedAt":"2026-04-29T09:09:04.554Z"}}