{"id":"ce831fa0-b0f9-4d23-9461-75fc58dcf9f3","shortId":"pktEVe","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 is a collection of x402-protocol pay-per-call API endpoints hosted on the Base network. The specific endpoint `/api/v1/claims/5` is listed as \"Premium API Access\" and returns a standard x402 challenge requesting payment in USDC (contract 0x8335…2913 on Base). The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made via the x402 exact scheme with no API keys, subscriptions, or rate limits advertised.\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.\n\nHowever, the specific `/api/v1/claims/5` endpoint's purpose is unclear — it does not map to any of the named endpoints on the landing page, and no documentation, request/response schema, or examples are available. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what data or service this endpoint actually returns, agents should treat this as a stub listing with limited actionable information.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-payment","base-network","no-api-key","pay-per-call"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The endpoint path /api/v1/claims/5 does not match any of the named endpoints listed on the landing page — its actual functionality is unknown.","No API documentation, request schema, or response schema is available; docs/pricing/README pages all return only a wallet-connect prompt.","Without knowing what this endpoint returns, agents cannot make informed purchasing decisions."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/5","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/claims/5","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 challenge, confirming pricing and payment details. However, there is no documentation, no request/response schema, no examples, and the specific endpoint path (/api/v1/claims/5) does not correspond to any named service on the landing page. The docs pages are empty. This is effectively a 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'/request':166 '0.02':10,28,96,165 '000':87 '0x8335':77 '20':86 '2913':78 '6':92 'Base network API' 'USDC micropayment API' 'access':6,24,65 'across':122 'action':239 'actual':227 'advertis':115,120 'agent':229 'ai':132 'amount':83 'analysi':136 'analyt':126 'api':5,16,23,34,49,64,109,203 'avail':200 'base':8,26,54,80,88 'base-network' 'broader':117 'call':48 'categori':124 'challeng':71 'classif':139 'collect':40 'connect':212 'content':218 'contract':76 'convers':156 'crypto-paid API' 'data':125,129,222 'decim':93 'doc':202 'document':194 'embed':140 'endpoint':50,58,121,159,173,187,226 'equal':95 'estim':150 'exact':105 'exampl':198 'exchang':145 'export':130 'feed':144 'financ':141 'four':123 'gas':149 'gate':3,21 'generat':157 'geocod':154 'host':51 'howev':169 'inform':240 'infrastructur':152 'insight':131 'key':17,35,110 'know':220 'land':190 'learn':134 'limit':114,238 'list':61,161,236 'lowpaymentfee' 'lowpaymentfee.com':37,118 'machin':133 'made':101 'map':181 'max':82 'metric':127 'name':186 'network':55 'no-api-key' 'page':191,207 'pay':9,27,46 'pay-per-cal':45 'pay-per-call' 'pay-per-call API' 'payment':73,99 'per':11,29,47,97 'per-request-billing' 'platform':119 'point':168 'premium':4,22,63 'premium API access' 'price':143,167,204 'prompt':214 'protocol':44 'purpos':175 'quot':148 'rate':113,146 'readm':206 'report':128 'request':12,30,72,98 'request/response':195 'requir':18,36,84 'return':67,209,228 'schema':196 'scheme':106 'sentiment':135 'servic':224 'specif':57,171 'standard':69 'stub':235 'subscript':111 'substant':217 'summar':138 'text':137 'token':147 'treat':231 'unclear':177 'unit':89 'usdc':14,32,75,91 'usdc-payment' 'util':153 'valid':155 'via':102 'wallet':213 'web3':142 'without':219 'x402':2,20,43,70,104 'x402 API' 'x402-gated':1,19 'x402-payment' 'x402-protocol':42","prices":[{"id":"d1f63f7d-3c6c-47f0-80fb-57de6beac37c","listingId":"ce831fa0-b0f9-4d23-9461-75fc58dcf9f3","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/claims/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:51.901Z"}],"sources":[{"listingId":"ce831fa0-b0f9-4d23-9461-75fc58dcf9f3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:51.901Z","lastSeenAt":"2026-04-23T20:32:29.751Z"}],"details":{"listingId":"ce831fa0-b0f9-4d23-9461-75fc58dcf9f3","quickStartSnippet":"# POST with x402 payment header (pseudo-code)\ncurl -X POST https://lowpaymentfee.com/api/v1/claims/5 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/5"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/claims/5"},{"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 advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for API access without managing API keys or subscriptions","Integrating x402-compatible agents with low-cost utility endpoints","Accessing data, AI, or finance endpoints via crypto micropayments on Base"],"bestFor":["Agents or developers wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or experimental usage where per-call pricing is preferred"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads requiring bulk pricing or rate-limit guarantees","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.281Z"},"updatedAt":"2026-04-23T20:32:29.751Z"}}