{"id":"37131612-6de1-4a3e-96e9-fd4c30ca0541","shortId":"aBWzmq","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com is an x402-protocol pay-per-request API resource (resource ID 188) labeled \"Premium API Access.\" It is part of a broader platform offering multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all gated behind x402 micropayments on the Base network.\n\nThe specific endpoint `/api/v1/generate/resource/188` accepts POST requests and returns `application/json` responses. Payment is settled in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge advertises a `maxAmountRequired` of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request — consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The payment timeout is 300 seconds.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely thin — the docs, API, pricing, 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 \"Premium API Access\" or \"resource/188\" actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it impossible to determine the actual functionality behind this specific resource ID.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method"],"categories":["api","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available — all doc/pricing/API pages show only 'Connect wallet'","Unknown functionality: 'Premium API Access' and 'resource/188' are not described anywhere","No OpenAPI schema or request/response examples available","No information on what input the POST body should contain or what the response looks like"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/188","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/generate/resource/188","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC per call). However, there is zero documentation on what this specific resource does, no request/response schema, no examples, and all doc pages render only 'Connect wallet'. The listing is effectively a 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'/request':133 '0.02':120,132 '000':110 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':99 '188':46 '20':109 '300':141 '402':203 '6':115 'Base network API' 'USDC API' 'accept':86 'access':50,154,193 'across':134 'actual':196,217 'advertis':105,128,145 'ai':65 'analyt':64 'api':5,19,42,49,60,147,162,192 'application/json':91 'base':8,22,80,101,111 'base-network' 'behind':75,219 'broader':56 'call':12,26 'captur':205 'categori':61 'challeng':104,204 'confirm':201 'connect':171 'consist':123 'content':177 'contract':98 'data':63 'decim':116 'descript':188 'determin':215 'doc':161 'document':156,210 'endpoint':6,20,30,84,136,199 'equal':119 'exampl':185 'extrem':158 'financ':68 'flat':129 'function':218 'gate':3,17,74 'howev':155 'id':45,223 'imposs':213 'includ':62 'infrastructur':71 'instant':153 'json-response' 'key':148 'label':47 'lack':208 'learn':67 'limit':151 'live':202 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':66 'make':211 'maxamountrequir':107 'micropay':77 'micropayment API' 'multipl':59 'network':81 'offer':58 'openapi':181 'page':166 'part':53 'pay':10,24,39 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':38 'payment':93,138 'per':11,25,40,121 'platform':57,144 'post':87 'post-method' 'premium':4,18,48,191 'premium API access' 'price':130,163 'prompt':173 'protocol':37 'rate':150 'readm':165 'render':168 'request':41,88,122 'request/response':184 'resourc':43,44,222 'resource/188':195 'respons':92 'return':90,197 'schema':182 'second':142 'settl':95 'site':126 'specif':83,221 'substant':176 'thin':159 'timeout':139 'unit':112 'usdc':14,28,97,118 'usdc-settlement' 'util':72 'wallet':172 'web3':69 'x402':2,16,36,76,103 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':35","prices":[{"id":"bbc5bbb3-8638-475a-b256-26fb24457d66","listingId":"37131612-6de1-4a3e-96e9-fd4c30ca0541","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/generate/resource/188","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:07.115Z"}],"sources":[{"listingId":"37131612-6de1-4a3e-96e9-fd4c30ca0541","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/188","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:07.115Z","lastSeenAt":"2026-04-22T23:01:00.370Z"}],"details":{"listingId":"37131612-6de1-4a3e-96e9-fd4c30ca0541","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/188 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/188"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/188"},{"claim":"The site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven API consumption with automatic USDC micropayments","Accessing pay-per-use utility or generation endpoints without API keys","Programmatic resource generation via x402-gated POST requests"],"bestFor":["Developers wanting keyless, pay-per-call API access on Base","AI agents with x402-compatible wallets needing on-demand API calls","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","Applications requiring guaranteed SLAs or support contracts","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.847Z"},"updatedAt":"2026-04-22T23:01:00.370Z"}}