{"id":"be29191e-6e28-4d82-b889-42976df9d97e","shortId":"T4Uqxe","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 91 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 gated behind the x402 payment protocol on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Each call costs $0.02 in USDC (20,000 base units with 6 decimals) settled on-chain via the x402 \"exact\" payment scheme to the provider's wallet. No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The crawled 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, and no example payloads available. The endpoint path suggests it returns a payment schedule for a loan identified by ID 91, but the request body format and response structure are unknown. The endpoint is confirmed live (returns 402 challenge on POST).","tags":[],"capabilities":["loan-schedule","amortization","pay-per-request","x402-payment","usdc-base","no-api-key","json-response"],"categories":["finance"],"synonyms":["loan amortization schedule","loan payment schedule","loan calculator API","amortization table","loan repayment plan","payment schedule API"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or request/response schema provided; request body format is unknown","Endpoint is hardcoded to loan ID 91; unclear if other loan IDs are supported or how loans are created","The platform lists many diverse API categories (AI, analytics, finance, utilities) all at $0.02 — legitimacy and data quality are unverifiable"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/91/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/91/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 and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The loan endpoint path is specific to loan ID 91 with no indication of how to use other IDs. Docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'000':99 '20':98 '402':211 '6':103 '91':42,194 'accept':86 'ai/ml':64 'amort':2,15,34 'amortization' 'amortization table' 'analyt':63 'api':4,17,60,121,150 'attach':131 'avail':178 'base':12,25,80,100 'behind':73 'bodi':198 'broader':52 'call':59,93 'caller':129 'chain':108 'challeng':212 'confirm':208 'connect':159 'content':165 'cost':94 'crawl':148 'crypto':67 'data':62 'decim':104 'doc':149 'document':143 'endpoint':28,85,180,206 'exact':112 'exampl':176 'extrem':145 'financ':66 'format':199 'gate':72 'header':136 'id':41,193 'identifi':191 'infer':65 'json':91 'json-response' 'key':122 'limit':124 'live':209 'loan':1,14,33,39,40,190 'loan amortization schedule' 'loan calculator API' 'loan payment schedule' 'loan repayment plan' 'loan-schedule' 'lowpaymentfee.com':30 'network':81 'no-api-key' 'offer':54 'on-chain':106 'openapi':169 'page':154 'part':49 'path':46,181 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payload':177 'payment':76,113,135,141,186 'payment schedule API' 'per':7,20,58 'platform':53 'post':87,214 'price':151 'prompt':161 'proof':142 'protocol':77 'provid':117 'rate':123 'readm':153 'render':156 'request':8,21,88,197 'request/response':172 'requir':128 'respons':201 'return':31,90,184,210 'schedul':3,16,35,187 'schema':173 'scheme':114 'servic':70 'settl':105 'simpli':130 'span':61 'spars':146 'spec':170 'specif':38 'structur':202 'subscript':126 'suggest':182 'unit':101 'unknown':204 'url':45 'usdc':13,26,83,97 'usdc-base' 'use':82 'util':69 'valid':139 'various':55 'via':9,22,109 'wallet':119,160 'x':134 'x-payment':133 'x402':10,23,75,111,140 'x402-payment'","prices":[{"id":"4ca59114-1def-4e97-9779-139f451902e2","listingId":"be29191e-6e28-4d82-b889-42976df9d97e","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/91/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":"2026-04-18T18:48:03.334Z"}],"sources":[{"listingId":"be29191e-6e28-4d82-b889-42976df9d97e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/91/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:03.334Z","lastSeenAt":"2026-04-29T06:34:07.533Z"}],"details":{"listingId":"be29191e-6e28-4d82-b889-42976df9d97e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/91/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":"Endpoint returns HTTP 402 with x402 challenge on POST, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/loans/91/schedule"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units of USDC with 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/loans/91/schedule"},{"claim":"Payment is in USDC on Base network to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/loans/91/schedule"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieve a detailed amortization schedule for a loan showing principal and interest breakdowns per period","Integrate loan payment schedule data into financial planning or lending applications","Automate loan analysis workflows with per-call payment and no subscription overhead"],"bestFor":["Developers needing on-demand loan schedule calculations without API key management","Agents or bots that need programmatic access to amortization data with crypto micropayments","Prototyping financial tools where pay-per-use pricing avoids upfront commitments"],"notFor":["Production systems requiring documented, stable API contracts with full schema definitions","Users who need to query arbitrary loan IDs (this endpoint is hardcoded to loan 91)","Teams that cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.811Z"},"updatedAt":"2026-04-29T06:34:07.533Z"}}