{"id":"64a57909-280b-4566-b334-4bf7c2662d2d","shortId":"ND76mP","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 37 in the URL path). It is part of a broader platform offering various 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. Payment settles in USDC on the Base network (asset contract 0x8335…2913). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The response MIME type is application/json.\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 additional technical detail. 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 exact request body format and response schema for the loan schedule must be inferred or discovered experimentally.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","loan repayment plan","mortgage schedule","payment breakdown","loan calculator API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no technical content.","No OpenAPI or schema definition found; request body format and response structure are unknown.","The endpoint path includes a hardcoded loan ID (37); it is unclear whether other loan IDs are supported or how to create/query loans.","The platform lists many diverse API categories (AI, analytics, finance, infrastructure) all at $0.02 — the breadth and uniform pricing may indicate placeholder or demo endpoints."],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/37/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/37/schedule","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no examples, and all documentation pages render only a wallet-connect prompt. The specific loan ID (37) hardcoded in the path is unexplained. Effectively a stub 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'/docs':164 '/pricing':166 '/readme':168 '0.02':10,24,79,147 '000':138 '0x8335':128 '20':137 '2913':129 '37':47 '402':204 '6':143 'accept':94 'addit':179 'ai/ml':69 'amort':2,16,39 'amortization calculator' 'amount':132 'analyt':68 'api':4,18,65,84 'application/json':154 'asset':126 'avail':195 'base':14,28,124,139 'beyond':156 'bodi':210 'broader':57 'call':8,22,135 'caller':105 'challeng':205 'commit':91 'confirm':199 'connect':174 'contain':113 'contract':127 'crypto':72 'data':67 'decim':144 'detail':181 'discov':223 'document':155,190 'enabl':32 'endpoint':33,93,197 'equal':146 'exact':208 'exampl':193 'experiment':224 'extrem':161 'financ':71 'format':211 'gate':99 'header':112 'id':46 'includ':107 'infer':70,221 'json-response' 'key':85 'land':158 'limit':88 'live':200 'loan':1,15,38,44,45,217 'loan calculator API' 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':35 'maximum':131 'mime':151 'mortgage schedule' 'must':106,219 'network':125 'no-api-key' 'offer':59 'openapi':185 'page':159,169 'part':54 'path':51 'pay':6,20,62 'pay-per-cal':5,19 'pay-per-request':61 'payload':194 'payment':103,111,116,118 'payment breakdown' 'per':7,21,63,80,134 'platform':58 'post':95 'price':77 'prompt':176 'proof':117 'proper':203 'protocol':104 'rate':87 'render':171 'request':64,81,96,209 'request/response':188 'requir':133 'respons':150,213 'return':36,201 'schedul':3,17,40,218 'schema':189,214 'servic':75 'settl':119 'span':66 'spars':162 'spec':186 'specif':43 'technic':180 'type':152 'unit':140 'url':50 'usd':148 'usdc':12,26,121,142 'usdc-base-network' 'util':74 'valid':115 'various':60 'via':11,25 'wallet':175 'x':110 'x-payment':109 'x402':31,102 'x402-enabled':30 'x402-payment'","prices":[{"id":"a5bd0d90-b8c8-4025-abf7-832cb92e0064","listingId":"64a57909-280b-4566-b334-4bf7c2662d2d","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/37/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":"2026-04-18T18:47:38.602Z"}],"sources":[{"listingId":"64a57909-280b-4566-b334-4bf7c2662d2d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/37/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:38.602Z","lastSeenAt":"2026-04-29T09:35:01.667Z"}],"details":{"listingId":"64a57909-280b-4566-b334-4bf7c2662d2d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/37/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 x402Version 1, accepting USDC on Base network at maxAmountRequired 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/loans/37/schedule"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/loans/37/schedule"}],"useCases":["Retrieve a detailed amortization schedule for a loan showing principal and interest breakdowns per period","Integrate loan schedule data into a financial planning or lending application","Automate loan payment calculations without maintaining local amortization logic"],"bestFor":["Agents or apps needing on-demand loan amortization data via a simple HTTP call","Developers who want keyless, pay-per-use financial APIs settled in crypto","Prototyping financial tools without signing up for traditional API providers"],"notFor":["Users who need bulk or batch loan calculations at high volume (no documented batch endpoint)","Anyone requiring detailed API documentation or guaranteed SLAs before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.09Z"},"updatedAt":"2026-04-29T09:35:01.667Z"}}