{"id":"83c4dc03-946e-4a3c-bc03-38264f2f38b8","shortId":"7Xf5b5","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific resource at `/api/v1/generate/resource/140` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. It is likely one of the generation/utility endpoints offered by the platform.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required per call is 20,000 base units of USDC, which at 6 decimals equals $0.02 USD — consistent with the platform's advertised flat pricing of $0.02 per request. The endpoint accepts HTTP POST requests and returns `application/json` responses. No API keys are required; payment is made inline via the `X-PAYMENT` header per the x402 specification.\n\nThe platform advertises no rate limits, no minimum commitments, and instant access. However, documentation 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 schema, no request/response examples, and no description of what data or functionality this specific resource provides. Agents should treat this as a low-documentation endpoint where the actual behavior must be discovered empirically.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","http-post"],"categories":["infrastructure","utility"],"synonyms":["premium API","lowpaymentfee","x402 API","USDC micropayment API","Base network API","pay-per-call API","resource generation"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/generate/resource/140 is undocumented; 'Premium API Access' is the only descriptor","No OpenAPI schema or request/response examples are provided","No information on what input the POST body should contain or what the response looks like"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/140","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/140","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of resource/140 is unknown. All non-landing pages return only a 'Connect wallet' 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'/request':17,34 '0.02':16,33,132,143 '000':122 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':113 '20':121 '6':129 'Base network API' 'USDC micropayment API' 'accept':148 'access':76,186 'actual':242 'advertis':139,177 'agent':230 'ai/ml':59 'amount':116 'analyt':58 'api':5,22,55,75,157,194 'application/json':154 'base':8,25,108,123 'behavior':243 'beyond':84 'call':12,29,119 'collect':46 'commit':183 'connect':203 'consist':134 'content':209 'contract':112 'data':57,62,223 'decim':130 'descript':220 'discov':246 'doc':193 'document':83,188,238 'empir':247 'endpoint':6,23,36,94,147,239 'equal':131 'exact':79 'exampl':217 'extrem':190 'finance/web3':61 'flat':140 'function':80,225 'gate':3,20 'generation/utility':93 'handl':101 'header':170 'howev':187 'http':149 'http-post' 'infer':60 'infrastructur':64 'inlin':164 'instant':185 'json-response' 'key':158 'label':86 'like':89 'limit':180 'list':72 'low':237 'low-document':236 'lowpaymentfee' 'lowpaymentfee.com':41 'made':163 'maximum':115 'minimum':182 'must':244 'network':109 'no-api-key' 'offer':44,95 'one':90 'openapi':213 'page':198 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payment':99,161,169 'per':11,28,53,118,144,171 'platform':42,98,137,176 'post':150 'premium':4,21,74 'premium API' 'price':141,195 'prompt':205 'protocol':50,105 'provid':229 'rate':179 'readm':197 'render':200 'request':54,145,151 'request/response':216 'requir':117,160 'resourc':68,228 'resource generation' 'respons':155 'return':153 'schema':214 'span':56 'spars':191 'specif':67,174,227 'substant':208 'treat':232 'unit':124 'usd':133 'usdc':14,31,111,126 'usdc-base' 'use':110 'util':65 'via':102,165 'wallet':204 'x':168 'x-payment':167 'x402':2,19,49,104,173 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"6d0b1701-3925-4cac-8d67-38ea7a50bc20","listingId":"83c4dc03-946e-4a3c-bc03-38264f2f38b8","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/140","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:09.207Z"}],"sources":[{"listingId":"83c4dc03-946e-4a3c-bc03-38264f2f38b8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/140","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:09.207Z","lastSeenAt":"2026-04-28T13:33:07.262Z"}],"details":{"listingId":"83c4dc03-946e-4a3c-bc03-38264f2f38b8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/140 \\\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":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/140"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/140"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a generation/utility endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless pay-per-request API access","Low-cost micropayment API consumption on Base L2"],"notFor":["Users who need well-documented API contracts and schemas before integration","High-volume production workloads requiring SLA guarantees","Anyone needing to understand exact endpoint behavior before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.833Z"},"updatedAt":"2026-04-28T13:33:07.262Z"}}