{"id":"6f50b0a1-c300-4063-91a6-b07231c48dc8","shortId":"922SsF","kind":"x402","title":"x402-gated loan data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated loan data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/loans/3` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML, finance, infrastructure utilities, and more. The specific resource appears to serve loan-related data (inferred from the URL path), though no detailed documentation or response schema is available for this particular endpoint.\n\nThe endpoint is live and returns a standard x402 payment challenge. It accepts POST requests and settles payments on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). The platform advertises a flat $0.02 per request across all endpoints, with 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 spec, no response examples, and no description of what the `/api/v1/loans/3` endpoint actually returns. The endpoint is functional from a payment-protocol standpoint, but the lack of documentation makes it difficult to know what data you'll receive after paying.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","loan-data","post-method","no-api-key"],"categories":["finance","data"],"synonyms":["loan API","x402 loan endpoint","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-gated API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or output schema provided; the actual response payload is unknown","The specific purpose of /api/v1/loans/3 is inferred solely from the URL path; no official description exists","No rate limit or SLA information available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/3","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/3","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, confirming it accepts USDC payments on Base at $0.02 per call. However, there is no documentation, no OpenAPI spec, no response schema, and no description of what data the /api/v1/loans/3 endpoint actually returns. The docs/pricing/README pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'0.02':10,24,126,136 '000':119 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':112 '20':118 '6':129 'Base network API' 'USDC micropayment API' 'accept':99 'access':151 'across':139 'actual':190 'advertis':133 'ai/ml':53 'amount':115 'analyt':52 'api':49,144,159 'appear':62 'avail':82 'base':8,22,107,120 'base-network' 'challeng':97 'collect':40 'connect':167 'content':173 'contract':111 'crypto-gated API' 'data':5,19,51,68,213 'decim':130 'descript':184 'detail':76 'difficult':209 'doc':157 'document':77,152,206 'endpoint':6,20,30,86,88,141,189,193 'equal':125 'exampl':181 'extrem':154 'financ':54 'flat':135 'function':195 'gate':3,17 'infer':69 'infrastructur':55 'instant':150 'key':145 'know':211 'lack':204 'limit':148 'live':90 'll':215 'loan':4,18,66 'loan API' 'loan-data' 'loan-rel':65 'lowpaymentfee' 'lowpaymentfee.com':37 'make':207 'maximum':114 'network':108 'no-api-key' 'openapi':177 'page':162 'part':34 'particular':85 'path':73 'pay':9,23,46,218 'pay-per-call API' 'pay-per-request':45 'payment':96,104,199 'payment-protocol':198 'per':11,25,47,137 'platform':38,132 'post':100 'post-method' 'price':158 'prompt':169 'protocol':44,200 'rate':147 'readm':161 'receiv':216 'relat':67 'render':164 'request':12,26,48,101,138 'requir':116 'resourc':61 'respons':79,180 'return':92,191 'schema':80 'serv':64 'settl':103 'span':50 'spars':155 'spec':178 'specif':60 'standard':94 'standpoint':201 'substant':172 'though':74 'unit':121 'url':72 'usdc':14,28,110,123,127 'usdc-settlement' 'use':109,128 'util':56 'wallet':168 'x402':2,16,43,95 'x402 loan endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"3ea6c0bf-6024-4f33-9a2b-637dbd713239","listingId":"6f50b0a1-c300-4063-91a6-b07231c48dc8","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:34.375Z"}],"sources":[{"listingId":"6f50b0a1-c300-4063-91a6-b07231c48dc8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:34.375Z","lastSeenAt":"2026-04-28T13:33:35.270Z"}],"details":{"listingId":"6f50b0a1-c300-4063-91a6-b07231c48dc8","quickStartSnippet":"# POST with x402 payment header (USDC on Base)\ncurl -X POST https://lowpaymentfee.com/api/v1/loans/3 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/3"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/3"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving loan data on a pay-per-request basis without API key registration","Integrating loan information into agent workflows that support x402 payments","Accessing financial data endpoints with USDC micropayments on Base"],"bestFor":["Agents or applications that support x402 payment protocol","Users who want keyless, pay-as-you-go API access","Developers building on Base who hold USDC"],"notFor":["Users who need detailed API documentation or response schemas before purchasing","Applications requiring high-volume, subscription-based access at lower per-call cost","Anyone needing loan data with guaranteed SLA or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.255Z"},"updatedAt":"2026-04-28T13:33:35.270Z"}}