{"id":"a9c7a861-b8c7-4173-8c53-be9a4472ee19","shortId":"J44mTu","kind":"x402","title":"Pay-per-call loan data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call loan data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at `/api/v1/loans/4` is part of the lowpaymentfee.com platform, which offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 protocol for payment, settling in USDC on the Base network. The specific resource at `/api/v1/loans/4` is labeled \"Premium API Access\" and accepts POST requests.\n\nThe x402 challenge confirms the endpoint is live, requiring a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the platform's uniform pricing of $0.02/request across all listed APIs. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is instant upon payment.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. The endpoint path suggests loan-related data (possibly a specific loan record with ID 4), but no schema, request parameters, or response format are documented. The broader platform lists many endpoint categories but provides no detailed documentation for any of them. Without request/response schemas or examples, the actual data returned by this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method","loan-data"],"categories":["finance","data"],"synonyms":["loan API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","loan data endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No request parameters or response schema documented for this endpoint","The endpoint path '/api/v1/loans/4' suggests a specific loan record but its purpose and data format are unknown","The endpoint is not listed on the provider's own homepage among their advertised APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/4","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/4","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 documentation, no request/response schema, no examples, and the purpose of the /loans/4 path is entirely undocumented. The docs pages are empty beyond a wallet-connect 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'/request':17,34,137 '0.02':16,33,125,136 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x8335':113 '20':107 '2913':114 '300':150 '4':203 '6':120 'Base network API' 'USDC micropayment API' 'accept':91 'access':89,161 'across':138 'actual':236 'address':146 'advertis':160 'ai/ml':58 'analyt':57 'api':54,88,141,154,172 'base':9,26,78,109,116 'base-network' 'broader':215 'call':4,21 'categori':220 'challeng':96 'confirm':97 'connect':181 'consist':128 'content':187 'crypto':61 'data':6,23,56,195,237 'decim':121 'detail':224 'doc':171 'document':166,213,225 'endpoint':7,24,36,66,99,189,219,241 'exampl':234 'extrem':168 'financ':60 'format':211 'id':202 'infer':59 'instant':163 'key':155 'label':86 'limit':158 'list':140,217 'live':101 'loan':5,22,193,199 'loan API' 'loan data endpoint' 'loan-data' 'loan-rel':192 'lowpaymentfee' 'lowpaymentfee.com':43 'made':144 'mani':218 'maximum':104 'network':79 'no-api-key' 'offer':46 'page':176 'paramet':208 'part':40 'path':190 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':50 'payment':72,105,142,165 'per':3,20,52,126 'platform':44,131,216 'possibl':196 'post':92 'post-method' 'premium':87 'premium API access' 'price':134,173 'prompt':183 'protocol':70 'provid':222 'rate':157 'readm':175 'record':200 'relat':194 'render':178 'request':53,93,127,207 'request/response':231 'requir':102 'resourc':82 'respons':210 'return':238 'schema':206,232 'second':151 'servic':64 'settl':12,29,73 'sinc':117 'span':55 'spars':169 'specif':81,198 'substant':186 'suggest':191 'timeout':152 'translat':123 'uniform':133 'unit':110 'unknown':243 'upon':164 'usdc':14,31,75,112,118 'usdc-settlement' 'use':67,119 'util':63 'varieti':48 'via':10,27 'wallet':182 'without':230 'x402':11,28,69,95 'x402 API' 'x402-payment'","prices":[{"id":"472c871c-21d2-4961-a359-b93a5c669b01","listingId":"a9c7a861-b8c7-4173-8c53-be9a4472ee19","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:37.433Z"}],"sources":[{"listingId":"a9c7a861-b8c7-4173-8c53-be9a4472ee19","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:37.433Z","lastSeenAt":"2026-04-28T13:04:13.408Z"}],"details":{"listingId":"a9c7a861-b8c7-4173-8c53-be9a4472ee19","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/4 \\\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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/4"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/4"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching loan-related data on a per-request payment basis without needing an API key","Integrating pay-per-call financial data into agent workflows using x402 protocol","Accessing premium loan information settled via USDC on Base L2"],"bestFor":["Agents or developers who want keyless, pay-per-use API access","Users comfortable with x402 crypto-payment flows on Base","Quick one-off loan data lookups without subscription commitments"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.129Z"},"updatedAt":"2026-04-28T13:04:13.408Z"}}