{"id":"3d21cb07-a4ff-4b5d-ac99-fc561e775e27","shortId":"ycGC7W","kind":"x402","title":"Loan calculation endpoint on Base, pay-per-call via x402 with USDC.","tagline":"Loan calculation endpoint on Base, pay-per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides a loan-related API at the path `/api/v1/loans/30`. 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 endpoints use the x402 payment protocol, settling in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific `/api/v1/loans/30` endpoint is described only as \"Premium API Access\" in the x402 challenge. The path structure suggests it may return loan calculation or amortization data (possibly for a 30-year term), but no documentation, request schema, or response schema is available to confirm the exact functionality. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the platform's uniform $0.02/request pricing shown on the landing page.\n\nThe endpoint is live and returns a valid x402 402 challenge when called via POST. However, documentation pages (/docs, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request format, required parameters, and response structure remain unknown.","tags":[],"capabilities":["loan-calculation","pay-per-request","x402-payment","usdc-settlement","base-network"],"categories":["finance"],"synonyms":["loan API","mortgage calculator","amortization API","loan payment","financial calculation","loan rates","x402 finance endpoint"],"warnings":["No API documentation available — /docs, /pricing, and /README pages all return only a wallet connect prompt with no content","Exact request parameters and response format are unknown; the endpoint path suggests loan data but this is unconfirmed","The endpoint is not listed on the provider's landing page among the advertised APIs, raising questions about its status"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/30","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/30","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, but there is no documentation, no request/response schema, and no description beyond the generic 'Premium API Access' label. The actual functionality of /api/v1/loans/30 is inferred from the URL path 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'/docs':192 '/pricing':193 '/readme':194 '/request':167 '0.02':157,166 '000':148 '20':147 '30':121 '402':183 '6':153 'access':101 'actual':208 'advertis':142 'ai/ml':59 'amort':116 'amortization API' 'analyt':58 'api':36,55,82,100 'avail':133 'base':5,18,78,149 'base-network' 'broader':46 'calcul':2,15,114 'call':9,22,186 'challeng':105,141,184 'commit':89 'confirm':135 'connect':199 'consist':160 'content':205 'cost':145 'crypto':62 'data':57,117 'decim':154 'describ':96 'document':126,190 'dozen':49 'endpoint':3,16,28,67,94,175 'equal':156 'exact':137 'financ':61 'financial calculation' 'format':210 'function':138 'howev':189 'infer':60 'key':83 'land':172 'limit':86 'live':177 'loan':1,14,34,113 'loan API' 'loan payment' 'loan rates' 'loan-calculation' 'loan-rel':33 'lowpaymentfee.com':30 'maximum':144 'may':111 'mortgage calculator' 'network':79 'offer':48 'page':173,191 'paramet':212 'part':43 'path':39,107 'pay':7,20,52 'pay-per-cal':6,19 'pay-per-request':51 'payment':71 'per':8,21,53,158 'platform':47,163 'possibl':118 'post':188 'premium':99 'price':168 'prompt':201 'protocol':72 'provid':31 'rate':85 'relat':35 'remain':216 'request':54,127,159,209 'requir':90,211 'respons':130,214 'return':112,179,196 'schema':128,131 'servic':65 'settl':73 'shown':169 'span':56 'specif':92 'structur':108,215 'substant':204 'suggest':109 'term':123 'uniform':165 'unit':150 'unknown':217 'usdc':13,26,75,152 'usdc-settlement' 'use':68 'util':64 'valid':181 'via':10,23,187 'wallet':200 'x402':11,24,70,104,140,182 'x402 finance endpoint' 'x402-payment' 'year':122","prices":[{"id":"cd4fcef8-68ba-4501-bc99-6dafa82ff406","listingId":"3d21cb07-a4ff-4b5d-ac99-fc561e775e27","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/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:42.166Z"}],"sources":[{"listingId":"3d21cb07-a4ff-4b5d-ac99-fc561e775e27","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:42.166Z","lastSeenAt":"2026-04-29T08:34:44.761Z"}],"details":{"listingId":"3d21cb07-a4ff-4b5d-ac99-fc561e775e27","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/30 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/30"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching loan payment calculations or amortization schedules on demand","Integrating loan data into financial planning tools without API key management","Agent-driven financial computations with micropayment settlement"],"bestFor":["Developers needing simple pay-per-call loan data without signup","AI agents that can settle x402 payments on Base","Prototyping financial apps with zero commitment pricing"],"notFor":["Users needing detailed API documentation before integration","High-volume batch loan calculations where per-call pricing adds up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.892Z"},"updatedAt":"2026-04-29T08:34:44.761Z"}}