{"id":"a57c062b-5a8c-4459-8849-0b3a5f0ec4e1","shortId":"jtvdrv","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 lowpaymentfee.com provides access to loan data (specifically loan ID 50) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with an exact-scheme challenge requiring up to 20,000 base units (i.e., $0.02 given USDC's 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a wide catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all at a uniform $0.02 per request. The platform emphasizes no API keys, no rate limits, and instant access. However, the specific endpoint `/api/v1/loans/50` is not listed on the homepage catalog, so its exact response schema and data content are unclear. The description in the x402 challenge is simply \"Premium API Access,\" which is generic.\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 example request/response, and no detailed description of what the loans endpoint returns. Prospective callers should be aware that the actual data payload is unverified — the endpoint is live (returns a proper 402 challenge) but what it delivers after payment is unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","loan-data","json-response","post-method"],"categories":["finance","data"],"synonyms":["loan API","x402 loan endpoint","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","The /api/v1/loans/50 endpoint is not listed in the site's own homepage catalog of available APIs","No OpenAPI spec or response schema provided — the actual data payload after payment is unknown","Generic description 'Premium API Access' gives no indication of what data is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/50","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/50","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 402 challenge, but there is no documentation, no OpenAPI schema, no example responses, and the specific /loans/50 endpoint isn't even listed in the site's own catalog. The actual data returned after payment is completely 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'/api/v1/loans/50':138 '/docs':175 '/pricing':177 '/readme':179 '/request':17,34 '0.02':16,33,85,119 '000':81 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':70 '20':80 '402':229 '50':47 '6':89 'Base network API' 'USDC micropayment API' 'accept':54 'access':40,133,166 'actual':217 'advertis':95 'ai/ml':108 'analyt':107 'api':104,126,165 'avail':240 'awar':214 'base':9,26,65,82 'base-network' 'broader':92 'call':4,21,103 'caller':211 'catalog':98,145 'challeng':76,161,230 'connect':185 'content':153,191 'contract':69 'crypto-paid API' 'data':6,23,43,106,111,152,218 'decim':90 'deliv':234 'descript':157,203 'detail':202 'document':170 'emphas':124 'endpoint':7,24,36,137,208,223 'exact':74,148 'exact-schem':73 'exampl':198 'extrem':172 'finance/web3':110 'generic':169 'given':86 'homepag':144 'howev':134 'i.e':84 'id':46 'infer':109 'infrastructur':113 'instant':132 'json':59 'json-response' 'key':127 'limit':130 'list':141 'live':225 'loan':5,22,42,45,207 'loan API' 'loan-data' 'lowpaymentfee' 'lowpaymentfee.com':38,93 'materi':241 'network':66 'openapi':195 'page':180 'pay':2,19,101 'pay-per-cal':1,18,100 'pay-per-call' 'pay-per-request API' 'payload':219 'payment':51,60,236 'per':3,20,102,120 'platform':94,123 'post':55 'post-method' 'premium':164 'prompt':187 'proper':228 'prospect':210 'protocol':52 'provid':39 'rate':129 'render':182 'request':56,121 'request/response':199 'requir':77 'respons':149 'return':58,209,226 'schema':150 'scheme':75 'settl':12,29,62 'simpli':163 'span':105 'spars':173 'spec':196 'specif':44,136 'substant':190 'unclear':155 'uniform':118 'unit':83 'unknown':238 'unverifi':221 'usdc':14,31,68,87 'usdc-settlement' 'use':67 'util':114 'via':10,27,48 'wallet':186 'wide':97 'x402':11,28,50,160 'x402 loan endpoint' 'x402-payment'","prices":[{"id":"52df8338-4cd9-488e-9a00-d76184d07989","listingId":"a57c062b-5a8c-4459-8849-0b3a5f0ec4e1","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/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:41.575Z"}],"sources":[{"listingId":"a57c062b-5a8c-4459-8849-0b3a5f0ec4e1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:41.575Z","lastSeenAt":"2026-04-28T11:33:36.040Z"}],"details":{"listingId":"a57c062b-5a8c-4459-8849-0b3a5f0ec4e1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/50 \\\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 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/50"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/50"},{"claim":"The site lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories but does not list a /loans endpoint","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving loan data for loan ID 50 via a single paid API call","Integrating pay-per-call financial data into agent workflows without API keys","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call data access on Base","Projects requiring USDC-settled micropayment API calls"],"notFor":["Users needing well-documented, schema-validated financial APIs","Bulk data retrieval where per-call pricing is inefficient","Production use cases requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.894Z"},"updatedAt":"2026-04-28T11:33:36.040Z"}}