{"id":"ca466ed0-ad9a-4cfd-8c32-10768fe192e5","shortId":"J3HVGH","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":"lowpaymentfee.com hosts a collection of x402-protocol pay-per-call API endpoints on the Base network, settling in USDC. The specific endpoint `/api/v1/benefits/64` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The site advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request.\n\nHowever, the `/api/v1/benefits/64` endpoint itself does not clearly map to any of the named categories on the landing page, and no documentation, request/response schema, or examples are available for it. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. Without knowing what data or functionality this specific endpoint returns, callers should treat it as an opaque premium resource until more documentation surfaces.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","no-rate-limit","json-response"],"categories":["api-gateway","misc"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC micropayment API","Base network API","premium API access","402 payment endpoint"],"warnings":["No documentation available — docs, pricing, and API pages render only 'Connect wallet' with no content.","The endpoint path /api/v1/benefits/64 does not appear in the site's listed API catalog; its actual functionality is unknown.","No request body schema or response schema is documented anywhere.","Output quality and reliability cannot be assessed without calling the endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/64","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what /api/v1/benefits/64 actually returns. No request or response schema, no examples, and the docs/pricing/API pages are empty beyond a wallet-connect prompt. The endpoint name 'Premium API Access' is generic and doesn't map to any listed 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'0.02':10,29,84,156 '000':79 '20':78 '402':73 '402 payment endpoint' 'Base network API' 'USDC micropayment API' 'access':6,25,69,99 'across':115 'advertis':90 'ai':125 'analysi':129 'analyt':119 'api':5,24,51,68,92,193 'attach':102 'avail':186 'base':8,27,55,80 'base-network' 'broader':111 'call':50,87 'caller':100,216 'categori':117,173 'challeng':74 'classif':132 'clear':166 'collect':42 'connect':199 'content':205 'convers':149 'data':118,122,209 'doc':190 'document':180,227 'embed':133 'endpoint':52,62,114,152,162,214 'estim':143 'exampl':184 'exchang':138 'export':123 'feed':137 'financ':134 'four':116 'function':211 'gas':142 'gate':3,22 'generat':150 'geocod':147 'header':106 'host':40 'howev':159 'infrastructur':145 'insight':124 'instant':98 'json-response' 'key':16,35,93 'know':207 'land':176 'learn':127 'limit':19,38,96 'list':65 'low payment fee' 'lowpaymentfee.com':39 'machin':126 'map':167 'metric':120 'name':172 'network':56 'no-api-key' 'no-rate-limit' 'offer':113 'opaqu':222 'page':177,194 'pay':9,28,48 'pay-per-cal':47 'pay-per-call API' 'pay-per-request' 'payment':105 'per':11,30,49,86,157 'platform':112 'premium':4,23,67,223 'premium API access' 'price':136,154,191 'prompt':201 'protocol':46 'quot':141 'rate':18,37,95,139 'render':196 'report':121 'request':12,31,75,109,158 'request/response':181 'resourc':224 'return':71,215 'schema':182 'sentiment':128 'settl':57 'simpli':101 'site':89 'specif':61,213 'summar':131 'surfac':228 'text':130 'token':140 'treat':218 'unit':81 'usd':85 'usdc':14,33,59,83 'usdc-settlement' 'util':146 'valid':148 'wallet':200 'web3':135 'without':206 'x402':2,21,45,104 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':44","prices":[{"id":"086e32db-f2a4-4ae0-9030-46803b406f41","listingId":"ca466ed0-ad9a-4cfd-8c32-10768fe192e5","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:45.589Z"}],"sources":[{"listingId":"ca466ed0-ad9a-4cfd-8c32-10768fe192e5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:45.589Z","lastSeenAt":"2026-04-22T04:02:19.858Z"}],"details":{"listingId":"ca466ed0-ad9a-4cfd-8c32-10768fe192e5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/64 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/benefits/64"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium resource behind a micropayment wall","Agent-driven workflows that need keyless, pay-as-you-go API calls","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment flows","AI agents that can autonomously settle USDC micropayments on Base","Use cases where avoiding API key management is valuable"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","Anyone needing free or subscription-based access rather than per-call payments","Production workloads requiring well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.894Z"},"updatedAt":"2026-04-22T04:02:19.858Z"}}