{"id":"571f6753-b01c-463a-ae6e-b30ba9685a6e","shortId":"P4m7VB","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/44` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs accessible via the x402 payment protocol on the Base network. The specific resource appears to serve loan-related data (resource ID 44), though the exact response schema is not documented. Payment is settled in USDC (contract `0x8335…2913` on Base) with a maximum charge of $0.02 per request (20,000 base units at 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure categories — all priced uniformly at $0.02 per request. The platform emphasizes no API keys, no rate limits, and instant access. However, the `/api/v1/loans/` path is not listed among the publicly advertised endpoints on the homepage, so this particular resource may be unlisted or experimental.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples available. The endpoint is confirmed live — it returns a proper 402 x402 challenge when called via POST — but without documentation it is unclear what request body (if any) is expected or what the response payload looks like.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","loan-data","json-response"],"categories":["finance","data"],"synonyms":["loan API","loan data endpoint","x402 loan","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto payment API"],"warnings":["The /api/v1/loans/44 path is not listed among the publicly advertised endpoints on the homepage — it may be unlisted, experimental, or deprecated.","No request body schema or response schema is documented anywhere.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no substantive content.","The exact nature of the data returned by this endpoint is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/44","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/44","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 works. However, there is no documentation, no OpenAPI spec, no request/response schema, and the /loans/44 path is not listed among the platform's advertised endpoints. The docs pages are empty beyond a wallet connect prompt. This is effectively a stub 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'/api/v1/loans/44':38 '/request':17,34 '0.02':16,33,102,133 '000':106 '0x8335':93 '20':105 '2913':94 '402':216 '44':78 '6':110 'Base network API' 'USDC micropayment API' 'access':56,147 'across':118 'advertis':116,158 'ai':121 'among':155 'analyt':120 'api':55,140,178 'appear':69 'avail':206 'base':9,26,64,96,107 'base-network' 'bodi':231 'broad':48 'broader':113 'call':4,21,220 'catalog':49 'categori':128 'challeng':218 'charg':100 'confirm':210 'connect':187 'content':193 'contract':92 'crypto payment API' 'data':6,23,75,119 'decim':111 'doc':177 'document':86,172,225 'emphas':138 'endpoint':7,24,36,117,159,208 'exact':81 'exampl':205 'expect':235 'experiment':171 'extrem':174 'financ':124 'homepag':162 'howev':148 'id':77 'infrastructur':127 'instant':146 'json-response' 'key':141 'learn':123 'like':242 'limit':144 'list':154 'live':211 'loan':5,22,73 'loan API' 'loan data endpoint' 'loan-data' 'loan-rel':72 'look':241 'lowpaymentfee' 'lowpaymentfee.com':43,114 'machin':122 'maximum':99 'may':167 'network':65 'offer':46 'openapi':197 'page':182 'part':40 'particular':165 'path':151 'pay':2,19,52 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':51 'payload':240 'payment':60,87 'per':3,20,53,103,134 'platform':44,115,137 'post':222 'price':130,179 'prompt':189 'proper':215 'protocol':61 'public':157 'rate':143 'readm':181 'relat':74 'render':184 'request':54,104,135,230 'request/response':200 'resourc':68,76,166 'respons':82,239 'return':213 'schema':83,201 'serv':71 'settl':12,29,89 'spars':175 'spec':198 'specif':67 'substant':192 'though':79 'unclear':228 'uniform':131 'unit':108 'unlist':169 'usag':204 'usdc':14,31,91 'usdc-settlement' 'via':10,27,57,221 'wallet':188 'web3':125 'without':224 'x402':11,28,59,217 'x402 loan' 'x402-payment'","prices":[{"id":"6d7c1032-a5aa-4209-b26a-3e6d272deb88","listingId":"571f6753-b01c-463a-ae6e-b30ba9685a6e","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:32.575Z"}],"sources":[{"listingId":"571f6753-b01c-463a-ae6e-b30ba9685a6e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:32.575Z","lastSeenAt":"2026-04-28T13:04:13.246Z"}],"details":{"listingId":"571f6753-b01c-463a-ae6e-b30ba9685a6e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/44 \\\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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/44"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/44"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/loans/ path is not listed among the publicly advertised endpoints","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving loan data for a specific loan record (ID 44) on demand","Integrating pay-per-call financial data into agent workflows without API key management","Demonstrating x402 payment protocol integration for micropayment-gated endpoints"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents needing keyless, pay-per-call access to financial data","Projects requiring USDC-settled micropayment API access"],"notFor":["Production use cases requiring documented request/response schemas","Bulk data retrieval where per-request pricing is inefficient","Users who need fiat payment rails or non-crypto settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.374Z"},"updatedAt":"2026-04-28T13:04:13.246Z"}}