{"id":"e138f8e2-f1cc-4cb7-8972-08484dfce60d","shortId":"WMYF56","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"lowpaymentfee.com offers a suite of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/benefits/1` is labeled \"Premium API Access\" and returns a 402 challenge requesting payment in USDC (contract 0x8335…2913 on Base). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. Payment is made via the x402 exact scheme, with a 300-second timeout window.\n\nThe broader lowpaymentfee.com 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 listed at the same $0.02/request price point. The platform emphasizes no API keys, no rate limits, no minimums, and instant access.\n\nHowever, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/benefits/1` endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the actual functionality behind the paywall is unknown.","tags":[],"capabilities":["x402-payment-gating","usdc-base-network","pay-per-request","no-api-key","premium-api-access"],"categories":["general","infrastructure"],"synonyms":["low payment fee API","x402 premium access","pay-per-call API","USDC micropayment API","Base network API","402 payment required API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","Actual functionality behind the paywall for /api/v1/benefits/1 is completely unknown","No examples of successful (paid) responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/1","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no description of what the endpoint actually returns once paid. The docs/pricing/README pages are all empty beyond a wallet connect prompt. This is effectively a stub 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'/request':164 '0.02':10,28,98,163 '000':89 '0x8335':77 '20':88 '2913':78 '300':110 '402':70,228 '402 payment required API' '6':94 'Base network API' 'USDC micropayment API' 'access':6,24,66,180 'across':120 'actual':221,233 'advertis':118 'ai':130 'amount':83 'analysi':134 'analyt':124 'api':5,16,23,34,46,65,171,188 'base':8,26,55,80,90 'behind':235 'broader':115 'call':45,86 'captur':230 'categori':122 'challeng':71,229 'classif':137 'confirm':226 'connect':197 'contract':76 'convers':154 'data':123,127 'decim':95 'descript':215 'detail':204 'doc':187 'document':182 'embed':138 'emphas':169 'endpoint':47,59,119,157,220,224 'equal':97 'estim':148 'exact':106 'exampl':212 'exchang':143 'export':128 'extrem':184 'feed':142 'financ':139 'four':121 'function':234 'gas':147 'gate':3,21,48 'generat':155 'geocod':152 'howev':181 'infrastructur':150 'insight':129 'instant':179 'key':17,35,172 'label':63 'learn':132 'limit':175 'list':159 'live':227 'low payment fee API' 'lowpaymentfee.com':37,116 'machin':131 'made':102 'maximum':82 'metric':125 'minimum':177 'network':56 'no-api-key' 'offer':38 'openapi':208 'page':192 'pay':9,27,43 'pay-per-cal':42 'pay-per-call API' 'pay-per-request' 'payment':73,100 'paywal':237 'per':11,29,44,85 'platform':117,168 'point':166 'premium':4,22,64 'premium-api-access' 'price':141,165,189 'prompt':199 'protocol':52 'quot':146 'rate':144,174 'readm':191 'render':194 'report':126 'request':12,30,72 'request/response':211 'requir':18,36,84 'return':68,222 'schema':209 'scheme':107 'second':111 'sentiment':133 'spars':185 'specif':58 'suit':40 'summar':136 'technic':203 'text':135 'timeout':112 'token':145 'unit':91 'unknown':239 'usd':99 'usdc':14,32,75,93 'usdc-base-network' 'util':151 'valid':153 'via':103 'wallet':198 'web3':140 'window':113 'x402':2,20,51,105 'x402 premium access' 'x402-gated':1,19 'x402-payment-gating'","prices":[{"id":"4231394e-f471-4ced-b608-fdb91f9b4802","listingId":"e138f8e2-f1cc-4cb7-8972-08484dfce60d","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:28.676Z"}],"sources":[{"listingId":"e138f8e2-f1cc-4cb7-8972-08484dfce60d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:28.676Z","lastSeenAt":"2026-04-22T05:31:53.602Z"}],"details":{"listingId":"e138f8e2-f1cc-4cb7-8972-08484dfce60d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/1\n# Returns 402 with x402 challenge. Include X-PAYMENT header with signed USDC payment on Base to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/benefits/1","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/benefits/1"},{"claim":"All 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"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/1"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 payment-gated APIs","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring free or fiat-only payment methods","Production workloads that need well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.759Z"},"updatedAt":"2026-04-22T05:31:53.602Z"}}