{"id":"a6e471c9-fa2e-4a3d-9fa1-f1afcc1d9817","shortId":"fKTMA4","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/138` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. It is one of many endpoints on the platform, all priced uniformly at $0.02 per request.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The challenge advertises a `maxAmountRequired` of 20,000 base units, which at 6 decimals equals $0.02. The endpoint accepts HTTP POST requests and returns `application/json`. No API keys or rate limits are advertised — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The docs, pricing, API, 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\" actually returns. The platform lists sibling endpoints for sentiment analysis, text summarization, geocoding, gas estimates, and more, but none have documented schemas either. The endpoint is confirmed live (returns 402 challenge correctly), but without knowing what data or service it provides, agents should treat this as a low-information listing.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post"],"categories":["api","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC micropayment API","Base network API","pay-per-call API","premium API access"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","The exact functionality of resource/138 is unknown; 'Premium API Access' is not descriptive","No OpenAPI schema or request/response examples exist","No information on what data or service is returned after payment","Sibling endpoints on the platform are equally undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/138","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/138","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 with a valid x402 402 challenge, but there is zero documentation on what the endpoint actually does, no request/response schema, and no examples. The description 'Premium API Access' is a generic label. Docs pages are empty. This is effectively a stub 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'/request':17,34 '0.02':16,33,100,133 '000':125 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':117 '20':124 '402':232 '6':130 'Base network API' 'USDC micropayment API' 'accept':136 'access':76,202 'actual':203 'advertis':120,150 'agent':244 'ai/ml':59 'analysi':212 'analyt':58 'api':5,22,55,75,144,172,201 'application/json':142 'attach':153 'base':8,25,112,126 'beyond':84 'call':12,29 'caller':151 'challeng':119,233 'collect':46 'confirm':229 'connect':180 'content':186 'contract':116 'correct':234 'data':57,62,239 'decim':131 'descript':197 'doc':170 'document':83,165,223 'either':225 'endpoint':6,23,36,92,135,209,227 'equal':132 'estim':217 'exact':79 'exampl':194 'extrem':167 'finance/web3':61 'function':80 'gas':216 'gate':3,20 'geocod':215 'handl':105 'header':158 'http':137 'http-post' 'infer':60 'inform':252 'infrastructur':64 'json-response' 'key':145 'know':237 'label':86 'limit':148 'list':72,207,253 'live':230 'low':251 'low payment fee API' 'low-inform':250 'lowpaymentfee' 'lowpaymentfee.com':41 'mani':91 'maxamountrequir':122 'network':113 'none':221 'offer':44 'one':89 'openapi':190 'page':175 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payment':103,157,163 'per':11,28,53,101 'platform':42,95,206 'post':138 'premium':4,21,74,200 'premium API access' 'price':97,171 'prompt':182 'proof':164 'protocol':50,109 'provid':243 'rate':147 'readm':174 'render':177 'request':54,102,139 'request/response':193 'resourc':68 'return':141,204,231 'schema':191,224 'sentiment':211 'servic':241 'sibl':208 'simpli':152 'span':56 'spars':168 'specif':67 'substant':185 'summar':214 'text':213 'treat':246 'uniform':98 'unit':127 'usdc':14,31,115 'usdc-base' 'use':114 'util':65 'valid':161 'via':106 'wallet':181 'without':236 'x':156 'x-payment':155 'x402':2,19,49,108,162 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"578f1470-f056-4d34-906b-fc6406c01296","listingId":"a6e471c9-fa2e-4a3d-9fa1-f1afcc1d9817","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:21.921Z"}],"sources":[{"listingId":"a6e471c9-fa2e-4a3d-9fa1-f1afcc1d9817","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/138","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:21.921Z","lastSeenAt":"2026-04-22T19:30:50.931Z"}],"details":{"listingId":"a6e471c9-fa2e-4a3d-9fa1-f1afcc1d9817","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/138 \\\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 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/138"},{"claim":"All endpoints on the platform are priced at $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 network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/138"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to an unspecified premium API resource via x402 micropayment","Demonstrating x402 payment flow on Base with USDC","Agent-driven pay-per-request API consumption without API keys"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that need keyless, pay-per-call API access","Testing USDC micropayment integrations"],"notFor":["Users who need documented request/response schemas before calling","Production workloads requiring SLA guarantees or detailed documentation","Anyone needing to understand exactly what data the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.113Z"},"updatedAt":"2026-04-22T19:30:50.931Z"}}