{"id":"869920c9-ddc2-411b-b416-71d0bc88442e","shortId":"qWn3GE","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 45 in the URL path). It is part of a broader platform offering dozens of 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 to the provider's wallet. There are no API keys, no rate limits, and no subscription commitments — you pay per request with an x402 payment header. The x402 challenge confirms the endpoint is live, advertising x402 version 1 with an \"exact\" payment scheme.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The specific input parameters for generating a loan schedule (e.g., principal, rate, term) and the structure of the returned schedule are unknown from the available material. The endpoint path suggests it may be tied to a pre-existing loan resource (ID 45) rather than accepting arbitrary loan parameters, but this cannot be confirmed.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-settlement","base-network","pay-per-request","json-api"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","mortgage schedule","loan repayment plan","payment breakdown","amortization table"],"warnings":["No API documentation available — all doc pages return only a 'Connect wallet' prompt","No OpenAPI or request/response schema provided","Endpoint path is hardcoded to loan ID 45; unclear if other loan IDs are supported or how loans are created","No examples of request body or response structure available from crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/45/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/45/schedule","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on request parameters, response schema, or what loan ID 45 represents. No OpenAPI spec, no examples, and all doc pages render only a wallet-connect prompt. This is effectively a stub 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'path':46,217 'pay':6,19,58,128 'pay-per-cal':57 'pay-per-request':5,18 'payload':187 'payment':77,134,151 'payment breakdown' 'per':7,20,59,129 'platform':53 'post':88 'pre':226 'pre-exist':225 'price':161 'princip':199 'prompt':171 'protocol':78 'provid':112 'rate':121,200 'rather':232 'readm':163 'render':166 'request':8,21,89,130 'request/response':182 'resourc':229 'return':31,91,207 'schedul':3,16,35,197,208 'schema':183 'scheme':152 'servic':71 'settl':106 'span':62 'spars':156 'spec':180 'specif':38,190 'structur':204 'subscript':125 'suggest':218 'term':201 'tie':222 'unit':102 'unknown':210 'url':45 'usdc':13,26,84,98 'usdc-settlement' 'use':83 'util':70 'version':146 'via':9,22 'wallet':114,170 'x402':10,23,76,133,137,145 'x402-payment'","prices":[{"id":"a33a531f-769d-48fc-9e34-eee9424bc979","listingId":"869920c9-ddc2-411b-b416-71d0bc88442e","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/45/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":"2026-04-18T18:47:39.803Z"}],"sources":[{"listingId":"869920c9-ddc2-411b-b416-71d0bc88442e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/45/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:39.803Z","lastSeenAt":"2026-04-29T09:35:01.691Z"}],"details":{"listingId":"869920c9-ddc2-411b-b416-71d0bc88442e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/45/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 version 1 challenge advertising USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/45/schedule"},{"claim":"Price is $0.02 per request (20000 base units of USDC with 6 decimals)","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/45/schedule"}],"useCases":["Retrieve a payment schedule for a loan showing principal and interest breakdown per period","Integrate loan amortization data into financial planning tools or dashboards","Programmatic access to loan schedule data for agent-driven financial workflows"],"bestFor":["Developers needing on-demand loan schedule calculations without API key management","AI agents that can settle micropayments on Base for financial data","Applications requiring pay-per-use financial computation endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume batch loan calculations where per-request pricing may add up","Anyone without a Base-compatible USDC wallet for x402 payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.053Z"},"updatedAt":"2026-04-29T09:35:01.691Z"}}