{"id":"d9ee655f-a38f-4bc9-ac85-4a2dfc5133b8","shortId":"HWJUGe","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the provider, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint `/api/v1/benefits/3` is labeled \"Premium API Access\" but the crawled material does not detail what data or functionality it returns beyond that label. It is not listed among the publicly advertised endpoints on the landing page (which cover analytics, AI inference, finance, and utility services), so it may be an unlisted or internal-tier resource. The x402 challenge confirms it is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call.\n\nBecause the provider's docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further documentation, there is no schema, example request/response, or detailed description available for this specific endpoint. Agents should be aware that the actual response payload is unknown and must be discovered empirically.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","premium-access"],"categories":["general","api-gateway"],"synonyms":["low payment fee API","x402 premium API","pay-per-call API","USDC micropayment API","Base network API","402 payment required API"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet' with no content.","The endpoint /api/v1/benefits/3 is not listed among the publicly advertised APIs on the landing page; its purpose is unknown.","No request or response schema is available; the actual payload must be discovered empirically.","Provider appears to be a demonstration or early-stage site with many advertised endpoints but no substantive docs."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/3","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/benefits/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no request/response schema, and no description of what this specific endpoint actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'0.02':10,29,81,183 '000':177 '20':176 '402 payment required API' '6':187 'Base network API' 'USDC micropayment API' 'accept':168 'access':6,25,46,111 'actual':232 'advertis':135 'agent':226 'ai':68,144 'among':132 'analyt':67,143 'api':5,24,45,93,110,197 'avail':221 'awar':229 'base':8,27,89,178 'base-network' 'beyond':125 'call':190 'categori':64 'challeng':163 'charg':172 'commit':101 'confirm':164 'connect':205 'cover':142 'crawl':114 'data':66,120 'decim':188 'descript':220 'detail':118,219 'discov':240 'doc':195 'document':211 'empir':241 'endpoint':40,57,77,105,136,225 'exampl':216 'financ':71,146 'function':122 'gate':3,22 'given':184 'i.e':182 'includ':65 'infer':145 'infrastructur':74 'intern':158 'internal-ti':157 'key':16,35,94 'label':108,127 'land':139 'learn':70 'limit':19,38,97 'list':131 'live':167 'low payment fee API' 'lowpaymentfee.com':42 'machin':69 'mani':56 'materi':115 'maximum':174 'may':152 'minimum':100 'must':238 'network':90 'no-api-key' 'offer':58 'one':54 'page':140,200 'pay':9,28 'pay-per-call API' 'pay-per-request' 'payload':234 'payment':50 'per':11,30,82,189 'post':169 'post-endpoint' 'premium':4,23,44,109 'premium-access' 'price':79,196 'prompt':207 'protocol':51 'provid':43,61,193 'public':134 'rate':18,37,96 'readm':199 'render':202 'request':12,31,83,170 'request/response':217 'requir':102 'resourc':160 'respons':233 'return':124 'schema':215 'servic':149 'settl':84 'span':63 'specif':104,224 'tier':159 'unit':179 'unknown':236 'unlist':155 'usdc':14,33,86,181,185 'usdc-settlement' 'util':75,148 'via':47 'wallet':206 'web3':72 'x402':2,21,49,162 'x402 premium API' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"b19b2327-f3e7-4c1b-8ad3-b5bf1987d63a","listingId":"d9ee655f-a38f-4bc9-ac85-4a2dfc5133b8","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/benefits/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:39.572Z"}],"sources":[{"listingId":"d9ee655f-a38f-4bc9-ac85-4a2dfc5133b8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:39.572Z","lastSeenAt":"2026-04-22T05:31:54.021Z"}],"details":{"listingId":"d9ee655f-a38f-4bc9-ac85-4a2dfc5133b8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/3 \\\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":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/benefits/3"},{"claim":"All endpoints priced at $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base with maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/benefits/3"},{"claim":"Provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Exploring x402-gated endpoints for automated workflows"],"bestFor":["Agents or developers wanting zero-signup, pay-as-you-go API access","Users comfortable with USDC payments on Base L2","Prototyping x402 payment flows against a live endpoint"],"notFor":["Users who need detailed API documentation or guaranteed response schemas before integrating","High-volume consumers who need bulk pricing or rate-limited SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.265Z"},"updatedAt":"2026-04-22T05:31:54.021Z"}}