{"id":"9f9b29b0-828d-4f26-a5e8-5b02a5a2523a","shortId":"SFmVzY","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 endpoint at lowpaymentfee.com provides a loan amortization schedule via a POST request to `/api/v1/loans/99/schedule`. 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 gated by the x402 payment protocol on the Base network.\n\nThe endpoint is live and returns a standard x402 402 challenge. Payment is settled in USDC (contract `0x8335…2913` on Base) using the \"exact\" scheme. The maximum amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02 per request. No API keys or rate limits are advertised; access is granted instantly upon payment. The payment timeout is 300 seconds.\n\nDocumentation is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema, and no example payloads. The endpoint path suggests it returns a payment schedule for a loan identified by ID 99, but the exact input parameters and response format are unknown. The `outputSchema` in the x402 challenge confirms the method is POST and the endpoint is discoverable, but provides no field-level detail.","tags":[],"capabilities":["loan-schedule","amortization","pay-per-request","x402-payment","usdc-base","no-api-key","post-endpoint"],"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, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema for request or response bodies","Endpoint path includes a hardcoded loan ID (99); unclear if this is parameterizable or a demo","No information on error handling, supported input fields, or response format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/99/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/99/schedule","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The endpoint path hints at loan schedule functionality but nothing is confirmed beyond the challenge metadata. This is effectively a stub 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'0.02':10,24,121 '000':111 '0x8335':97 '20':110 '2913':98 '300':142 '402':89 '6':116 '99':194 'access':132 'addit':164 'advertis':131 'ai/ml':62 'amort':2,16,36 'amortization' 'amortization table' 'amount':107 'analyt':61 'api':4,18,58,125,151 'base':14,28,78,100,112 'broader':49 'call':8,22 'challeng':90,210 'confirm':211 'connect':159 'content':166 'contract':96 'crypto':65 'data':60 'decim':117 'detail':227 'discover':220 'doc':149 'document':144 'dozen':52 'endpoint':30,81,180,218 'equal':120 'exact':103,197 'exampl':177 'extrem':146 'field':225 'field-level':224 'financ':64 'format':202 'gate':70 'grant':134 'id':193 'identifi':191 'infer':63 'input':198 'instant':135 'key':126 'level':226 'limit':129 'live':83 'loan':1,15,35,190 'loan amortization schedule' 'loan calculator API' 'loan payment schedule' 'loan repayment API' 'loan-schedule' 'lowpaymentfee.com':32 'maximum':106 'method':213 'network':79 'no-api-key' 'offer':51 'openapi':170 'outputschema':206 'page':154 'paramet':199 'part':46 'path':181 'pay':6,20,55 'pay-per-cal':5,19 'pay-per-request':54 'payload':178 'payment':74,91,137,139,186 'payment schedule generator' 'per':7,21,56,122 'platform':50 'post':40,215 'post-endpoint' 'price':150 'prompt':161 'protocol':75 'provid':33,222 'rate':128 'readm':153 'render':156 'request':41,57,123 'request/response':173 'requir':108 'respons':201 'return':85,184 'schedul':3,17,37,187 'schema':174 'scheme':104 'second':143 'servic':68 'settl':93 'span':59 'spec':171 'standard':87 'suggest':182 'technic':165 'thin':147 'timeout':140 'unit':113 'unknown':204 'upon':136 'usdc':12,26,95,119 'usdc-base' 'use':101 'util':67 'via':11,25,38 'wallet':160 'x402':73,88,209 'x402-payment'","prices":[{"id":"dd0e6d3b-a3ea-46dc-93c0-78e1e88690df","listingId":"9f9b29b0-828d-4f26-a5e8-5b02a5a2523a","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/99/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":"2026-04-18T18:48:18.517Z"}],"sources":[{"listingId":"9f9b29b0-828d-4f26-a5e8-5b02a5a2523a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/99/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:18.517Z","lastSeenAt":"2026-04-29T05:34:22.309Z"}],"details":{"listingId":"9f9b29b0-828d-4f26-a5e8-5b02a5a2523a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/99/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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/99/schedule"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/99/schedule"}],"useCases":["Generating an amortization schedule for a specific loan","Integrating loan payment breakdowns into fintech applications","Agent-driven financial planning that needs per-call loan schedule data"],"bestFor":["Developers needing on-demand loan schedule computation without subscription","AI agents that can pay per-call via x402/USDC on Base","Prototyping fintech tools with zero signup friction"],"notFor":["Bulk loan portfolio analysis requiring thousands of calls (no volume discounts documented)","Users who need detailed API documentation or guaranteed SLAs before integrating","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.124Z"},"updatedAt":"2026-04-29T05:34:22.309Z"}}