{"id":"627b1e1a-2381-49e2-87a5-6d3ca8d26ebc","shortId":"BNvYav","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 is a platform offering a suite of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint `/api/v1/benefits/66` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises 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 uniformly at $0.02 per request.\n\nHowever, the specific functionality behind `/api/v1/benefits/66` is not documented beyond the generic label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live (returns a proper 402 challenge), but what it actually returns after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-gated endpoint"],"warnings":["The specific functionality of /api/v1/benefits/66 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI schema, request body format, or response examples are provided anywhere.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no substantive content.","It is unclear what data or service is returned after successful payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/66","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/66","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 with clear pricing. However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/benefits/66 is completely opaque. The docs pages render only 'Connect wallet' with no useful 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'0.02':10,29,91,169 '000':95 '0x8335':82 '20':94 '2913':83 '402':222 '6':99 'Base network API' 'USDC micropayment API' 'accept':73 'access':6,25,71,187 'across':127 'actual':227 'addit':212 'advertis':125 'ai':137 'analysi':141 'analyt':131 'api':5,24,51,70,102,186,201 'attach':110 'base':8,27,60,85,96 'base-network' 'behind':176 'beyond':181 'broader':123 'call':50 'caller':108 'categori':129 'challeng':223 'classif':144 'confirm':217 'connect':207 'content':213 'contract':81 'convers':161 'cost':89 'crypto-gated endpoint' 'data':130,134 'decim':100 'doc':198 'document':180 'embed':145 'endpoint':52,64,126,164,215 'estim':155 'exampl':195 'exchang':150 'export':135 'feed':149 'financ':146 'four':128 'function':175 'gas':154 'gate':3,22,53 'generat':162 'generic':183 'geocod':159 'header':115 'howev':172 'infrastructur':157 'insight':136 'key':16,35,103 'label':184 'learn':139 'limit':19,38 'list':67 'live':218 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':138 'maximum':88 'metric':132 'network':61 'no-api-key' 'offer':43 'openapi':191 'page':202 'pay':9,28,48 'pay-per-cal':47 'pay-per-call API' 'pay-per-request' 'payment':76,114,120,230 'per':11,30,49,92,170 'platform':42,124 'post':74 'post-endpoint' 'premium':4,23,69,185 'premium API access' 'price':148,166,199 'prompt':209 'proof':121 'proper':221 'protocol':57 'quot':153 'rate':18,37,151 'render':204 'report':133 'request':12,31,75,93,171 'request/response':194 'requir':107 'return':219,228 'schema':192 'sentiment':140 'settl':78 'simpli':109 'specif':63,174 'subscript':105 'suit':45 'summar':143 'text':142 'token':152 'uniform':167 'unit':97 'unknown':232 'usdc':14,33,80 'usdc-settlement' 'util':158 'valid':118,160 'wallet':208 'web3':147 'x':113 'x-payment':112 'x402':2,21,56,119 'x402 API' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"802f1726-30bf-4fdf-ab4d-fefc7081e918","listingId":"627b1e1a-2381-49e2-87a5-6d3ca8d26ebc","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:46.197Z"}],"sources":[{"listingId":"627b1e1a-2381-49e2-87a5-6d3ca8d26ebc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:46.197Z","lastSeenAt":"2026-04-22T05:31:54.297Z"}],"details":{"listingId":"627b1e1a-2381-49e2-87a5-6d3ca8d26ebc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/66 \\\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 requesting USDC payment on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/benefits/66"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","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"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/66"}],"useCases":["Accessing premium data or services without creating an account or managing API keys","Programmatic pay-per-call access from AI agents or automated workflows","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can settle USDC micropayments on Base","Users who want instant, keyless API access at low per-request cost"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone who cannot transact in USDC on the Base network","High-volume consumers who need bulk pricing or subscription discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.899Z"},"updatedAt":"2026-04-22T05:31:54.297Z"}}