{"id":"cd51ce33-763f-4e78-929a-49e120fff0ca","shortId":"cjyVj7","kind":"x402","title":"x402-gated loan data endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated loan data endpoint on Base, pay-per-request with USDC.","description":"This endpoint at `/api/v1/loans/7` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML, finance, and infrastructure categories. The specific `/api/v1/loans/7` path is labeled \"Premium API Access\" in the x402 challenge but does not appear in the site's publicly listed API catalog, making its exact functionality unclear. It may return loan-related data for a resource identified as loan ID 7.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) when called via POST. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required per request is 20,000 base units of USDC, which at 6 decimals equals $0.02 USD — consistent with the site's advertised flat pricing of $0.02 per request. The platform advertises no API keys, no rate limits, and instant access.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/loans/7` endpoint actually returns. The output schema in the challenge only specifies that the input method is HTTP POST and the response MIME type is `application/json`.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","loan-data"],"categories":["finance"],"synonyms":["loan API","x402 loan endpoint","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto payment API"],"warnings":["The /api/v1/loans/7 endpoint is not listed in the site's public API catalog — its purpose and response format are undocumented.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no useful content.","No OpenAPI spec, no request body schema, and no response examples are available.","The endpoint's actual functionality (what loan data it returns, if any) cannot be verified without paying."],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/7","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/7","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, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific /api/v1/loans/7 path is not listed on the site's catalog. The actual data returned is 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'0.02':148,159 '000':138 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':129 '20':137 '402':114 '6':145 '7':102 'Base network API' 'USDC micropayment API' 'access':66,173 'actual':212 'advertis':155,164 'ai/ml':53 'amount':132 'analyt':52 'api':49,65,81,166,181 'appear':74 'application/json':235 'base':8,22,124,139 'base-network' 'call':116 'catalog':82 'categori':57 'challeng':70,112,219 'collect':40 'connect':189 'consist':150 'content':195 'contract':128 'crypto payment API' 'data':5,19,51,94 'decim':146 'descript':206 'doc':179 'document':174 'endpoint':6,20,30,104,211 'equal':147 'exact':85 'exampl':203 'extrem':176 'financ':54 'flat':156 'function':86 'gate':3,17 'http':113,227 'id':101 'identifi':98 'infrastructur':56 'input':224 'instant':172 'json-response' 'key':167 'label':63 'limit':170 'list':80 'live':106 'loan':4,18,92,100 'loan API' 'loan-data' 'loan-rel':91 'lowpaymentfee' 'lowpaymentfee.com':37 'make':83 'maximum':131 'may':89 'method':225 'mime':232 'network':125 'openapi':199 'output':215 'page':184 'part':34 'path':61 'pay':10,24,46 'pay-per-call API' 'pay-per-request':9,23,45 'payment':119 'per':11,25,47,134,160 'platform':38,163 'post':118,228 'premium':64 'price':157,180 'prompt':191 'protocol':44 'public':79 'rate':169 'readm':183 'relat':93 'render':186 'request':12,26,48,135,161 'request/response':202 'requir':133 'resourc':97 'respons':231 'return':90,108,213 'schema':200,216 'settl':121 'site':77,153 'span':50 'spars':177 'specif':59 'specifi':221 'substant':194 'type':233 'unclear':87 'unit':140 'usd':149 'usdc':14,28,127,142 'usdc-settlement' 'use':126 'valid':110 'via':117 'wallet':190 'x402':2,16,43,69,111 'x402 loan endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"af1b196e-9a03-4165-b744-bafa9c8ccb2e","listingId":"cd51ce33-763f-4e78-929a-49e120fff0ca","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:52.482Z"}],"sources":[{"listingId":"cd51ce33-763f-4e78-929a-49e120fff0ca","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:52.482Z","lastSeenAt":"2026-04-29T07:05:32.404Z"}],"details":{"listingId":"cd51ce33-763f-4e78-929a-49e120fff0ca","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/7\n# Returns HTTP 402 with x402 challenge.\n# Include a valid X-PAYMENT header (x402 protocol) to pay $0.02 USDC on Base and receive the JSON response.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/7"},{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/7"},{"claim":"The /api/v1/loans/7 endpoint is not listed among the site's publicly advertised APIs","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving loan data via a single pay-per-request call settled in USDC on Base","Agent-driven financial data retrieval without API key management","Programmatic access to loan information with micropayment gating"],"bestFor":["Developers wanting keyless, pay-per-call access to loan data","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Anyone needing detailed documentation or guaranteed SLAs before integrating","Bulk data retrieval where per-request pricing would be cost-inefficient","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.392Z"},"updatedAt":"2026-04-29T07:05:32.404Z"}}