{"id":"7c36a27c-c8f8-470f-bd08-74f569cd3c78","shortId":"dCJUDW","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/81` 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). Payment is handled via the x402 exact scheme — callers attach an X-PAYMENT header to each request and pay directly on-chain with no API keys, subscriptions, or rate limits required.\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. However, the specific endpoint `/api/v1/cards/81` does not clearly map to any of these named services — its purpose is described only as \"Premium API Access\" with a JSON mime type, and no further documentation or schema details are available.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples. While the x402 challenge is live and well-formed, the actual functionality behind this specific endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access"],"warnings":["No OpenAPI spec or request/response schema available for this endpoint","The specific purpose of /api/v1/cards/81 ('Premium API Access') is not documented — it does not map to any named service on the landing page","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","Cannot verify what data or functionality this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/81","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payments. However, there is no documentation, no request/response schema, no examples, and the specific function of /api/v1/cards/81 is entirely unclear. The docs pages are empty beyond a wallet connect 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'/api/v1/cards/81':67,183 '/docs':222 '/pricing':224 '/readme':226 '/request':17,34,176 '0.02':16,33,78,93,175 '000':84 '20':83 '6':91 'access':45,73,202 'actual':262 'advertis':130 'ai':10,27,142 'analysi':146 'analyt':136 'api':4,21,41,72,120,201 'attach':103 'avail':216 'base':7,24,61,85 'base network api' 'behind':51,264 'broader':128 'call':80 'caller':102 'categori':132 'chain':117 'challeng':254 'classif':149 'clear':186 'connect':232 'content':238 'convers':166 'cost':75 'data':9,26,135,139 'decim':92 'describ':197 'detail':214 'direct':114 'document':211,217 'embed':150 'endpoint':14,31,50,65,134,169,182,267 'estim':160 'exact':100 'exampl':250 'exchang':155 'export':140 'extrem':219 'feed':154 'financ':11,28,151 'form':260 'four':131 'function':263 'gas':159 'gate':3,20,44 'generat':167 'geocod':164 'handl':96 'header':108 'howev':179 'infrastructur':162 'insight':141 'json':205 'json-response' 'key':121 'learn':144 'limit':125 'list':69,171 'live':256 'low payment fee' 'lowpaymentfee.com':35 'machin':143 'map':187 'marketplac':42 'maxamountrequir':81 'metric':137 'micropay':55 'micropayment api' 'mime':206 'name':192 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'on-chain':115 'openapi':242 'page':227 'pay':113 'pay-per-request api' 'payment':94,107 'per':53,79 'per-request':52 'per-request-micropayment' 'platform':5,22,129 'point':178 'premium':71,200 'price':153,177 'prompt':234 'protocol':40 'purpos':195 'quot':158 'rate':124,156 'remain':268 'render':229 'report':138 'request':54,111 'request/response':245 'requir':126 'schema':213,246 'scheme':101 'sentiment':145 'servic':193 'settl':56 'spars':220 'spec':243 'specif':64,181,266 'subscript':122 'substant':237 'summar':148 'text':147 'token':157 'type':207 'unclear':269 'unit':86 'usag':249 'usdc':58,88 'usdc api access' 'usdc-base' 'util':13,30,163 'valid':165 'varieti':48 'via':97 'wallet':233 'web3':152 'well':259 'well-form':258 'x':106 'x-payment':105 'x402':2,19,39,99,253 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"6a77bc50-82f6-438f-b409-e2058460354b","listingId":"7c36a27c-c8f8-470f-bd08-74f569cd3c78","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:01.876Z"}],"sources":[{"listingId":"7c36a27c-c8f8-470f-bd08-74f569cd3c78","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:01.876Z","lastSeenAt":"2026-04-23T02:31:11.970Z"}],"details":{"listingId":"7c36a27c-c8f8-470f-bd08-74f569cd3c78","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Attach an X-PAYMENT header with a valid USDC payment on Base.\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/81 \\\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/cards/81"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/81"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"Four categories of endpoints listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without subscriptions or API keys","Agent-driven API consumption with on-chain USDC micropayments on Base","Accessing data, AI, finance, or utility endpoints via x402 protocol"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer on-chain payments over traditional API key management"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.518Z"},"updatedAt":"2026-04-23T02:31:11.970Z"}}