{"id":"687b7585-1c29-4d70-ac78-98f76dc22748","shortId":"seEBS3","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/50` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises four categories of endpoints: 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\nThe `/api/v1/cards/50` endpoint itself lacks detailed documentation — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what \"cards/50\" actually returns. The endpoint is confirmed live via a valid 402 challenge, but the actual functionality behind this specific path is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","no-api-key","no-rate-limit","post-endpoint","json-response"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access","402 payment api"],"warnings":["No documentation available for /api/v1/cards/50 — the purpose and response format of this endpoint are unknown","All secondary pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content","No OpenAPI schema or request/response examples provided","The endpoint path 'cards/50' does not correspond to any of the advertised API categories on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/50","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/cards/50","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 for what /api/v1/cards/50 actually does, no request/response schema, no examples, and the docs/pricing/API pages are all empty beyond a wallet-connect prompt. The specific functionality of this endpoint is entirely 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'/request':17,34,165 '0.02':16,33,78,93,164 '000':84 '20':83 '402':216 '402 payment api' '6':91 'access':45,73 'actual':206,220 'advertis':119 'ai':10,27,131 'analysi':135 'analyt':125 'api':4,21,41,72,95,179 'attach':104 'avail':229 'base':7,24,61,85 'base network api' 'behind':51,222 'broader':117 'call':80 'caller':102 'cards/50':205 'categori':121 'challeng':217 'classif':138 'confirm':211 'connect':185 'content':191 'convers':155 'cost':75 'data':9,26,124,128 'decim':92 'descript':202 'detail':173 'doc':176 'document':174 'embed':139 'endpoint':14,31,50,65,123,158,170,209 'estim':149 'exampl':199 'exchang':144 'export':129 'feed':143 'financ':11,28,140 'four':120 'function':221 'gas':148 'gate':3,20,44 'generat':156 'geocod':153 'header':109 'infrastructur':151 'insight':130 'json-response' 'key':96 'lack':172 'learn':133 'limit':99 'list':69,160 'live':212 'low payment fee' 'lowpaymentfee.com':35 'machin':132 'marketplac':42 'materi':230 'maxamountrequir':81 'metric':126 'micropay':55 'micropayment api' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':195 'page':180 'path':225 'pay-per-request api' 'payment':108,114 'per':53,79 'per-request':52 'per-request-micropayment' 'platform':5,22,118 'point':167 'post-endpoint' 'premium':71 'price':142,166,177 'prompt':187 'proof':115 'protocol':40 'quot':147 'rate':98,145 'render':182 'report':127 'request':54 'request/response':198 'requir':101 'return':207 'schema':196 'sentiment':134 'settl':56 'simpli':103 'specif':64,224 'summar':137 'text':136 'token':146 'unclear':227 'unit':86 'usdc':58,88 'usdc api access' 'usdc-base' 'util':13,30,152 'valid':112,154,215 'varieti':48 'via':213 'wallet':186 'web3':141 'x':107 'x-payment':106 'x402':2,19,39,113 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"f33791a2-b848-4362-b655-5d9d3872fa24","listingId":"687b7585-1c29-4d70-ac78-98f76dc22748","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/cards/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:41.250Z"}],"sources":[{"listingId":"687b7585-1c29-4d70-ac78-98f76dc22748","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:41.250Z","lastSeenAt":"2026-04-23T04:01:14.405Z"}],"details":{"listingId":"687b7585-1c29-4d70-ac78-98f76dc22748","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/50 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/50"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/50"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-friction API access without subscription overhead"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.63Z"},"updatedAt":"2026-04-23T04:01:14.405Z"}}