{"id":"1952ba91-b4dc-4db1-aa11-30c3f0f55246","shortId":"4kzCJ8","kind":"x402","title":"x402-gated loan data endpoint on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated loan data endpoint on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides premium API access to a loan resource (specifically `/api/v1/loans/42`) via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled in USDC (contract `0x8335…2913` on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The payment timeout is 300 seconds.\n\nThe specific resource `/api/v1/loans/42` appears to be a single loan record endpoint. The platform's landing page does not list this particular path among its advertised categories (data, AI, finance, infrastructure), so it may be a demo or ancillary resource. Documentation pages (`/docs`, `/pricing`, `/README`) returned only a \"Connect wallet\" prompt with no substantive content, so the exact schema of the loan object returned is unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key","json-response","loan-data"],"categories":["finance","data"],"synonyms":["loan API","x402 micropayment API","pay-per-call API","USDC gated endpoint","Base network API","lowpaymentfee","premium API access"],"warnings":["Documentation pages (/docs, /pricing, /README) all return only a 'Connect wallet' prompt with no actual content.","The specific endpoint /api/v1/loans/42 is not listed among the platform's advertised API categories — it may be a demo or test resource.","No response schema or example response is available; the structure of the returned loan object is unknown.","No OpenAPI spec or machine-readable schema was found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/42","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example request/response, and the specific loan resource is not listed on the platform's own landing page. The response body structure is entirely 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'/docs':200 '/pricing':201 '/readme':202 '0.02':10,28,119 '000':114 '0x8335':104 '20':113 '2913':105 '300':156 '6':124 'Base network API' 'USDC gated endpoint' 'accept':92 'access':44 'advertis':183 'ai':186 'ai/ml':74 'among':181 'amount':111 'analyt':73 'ancillari':196 'api':16,34,43,129 'appear':162 'attach':140 'base':8,26,88,107,115 'base-network' 'behind':83 'broader':61 'call':69 'caller':138 'categori':184 'commit':137 'connect':206 'content':212 'contract':103 'data':5,23,72,77,185 'decim':125 'demo':194 'document':198 'dozen':64 'endpoint':6,24,38,70,91,169 'equal':118 'exact':215 'financ':187 'finance/web3':76 'gate':3,21,82 'header':145 'infer':75 'infrastructur':79,188 'json':97 'json-response' 'key':17,35,130 'land':173 'limit':133 'list':177 'loan':4,22,47,167,219 'loan API' 'loan-data' 'lowpaymentfee' 'lowpaymentfee.com':40 'maximum':110 'may':191 'micropay':85 'network':89 'no-api-key' 'object':220 'offer':63 'page':174,199 'part':58 'particular':179 'path':180 'pay':9,27,67 'pay-per-cal':66 'pay-per-call API' 'pay-per-request' 'payment':54,98,144,150,153 'per':11,29,68,120 'platform':62,171 'post':93 'premium':42 'premium API access' 'prompt':208 'proof':151 'protocol':55 'provid':41 'rate':132 'record':168 'request':12,30,94,121 'requir':18,36 'resourc':48,160,197 'return':96,203,221 'schema':216 'second':157 'settl':100 'simpli':139 'singl':166 'span':71 'specif':49,159 'subscript':136 'substant':211 'timeout':154 'unit':116 'unknown':223 'usdc':14,32,102,122 'usdc-micropayment' 'use':123 'util':80 'valid':148 'via':51 'wallet':207 'x':143 'x-payment':142 'x402':2,20,53,84,149 'x402 micropayment API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"d4562b7c-7936-4e74-bcf0-bd2171c0cf8d","listingId":"1952ba91-b4dc-4db1-aa11-30c3f0f55246","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:39.794Z"}],"sources":[{"listingId":"1952ba91-b4dc-4db1-aa11-30c3f0f55246","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:39.794Z","lastSeenAt":"2026-04-28T13:33:35.493Z"}],"details":{"listingId":"1952ba91-b4dc-4db1-aa11-30c3f0f55246","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/42 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/42"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/42"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, pricing, and README pages return only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching loan record data on a per-request payment basis without needing an API key","Demonstrating x402 payment protocol integration for agent-to-agent commerce","Accessing financial data endpoints with instant USDC micropayments on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that need keyless, pay-per-call access to data endpoints","Projects requiring low-friction micropayment API access on Base"],"notFor":["Users needing detailed loan analytics or bulk loan portfolio data (schema and depth are unknown)","Anyone without a Base-compatible USDC wallet","Production use cases requiring documented response schemas and SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.009Z"},"updatedAt":"2026-04-28T13:33:35.493Z"}}