{"id":"228a24c5-0910-4f24-8a52-c5cc3dafe6d7","shortId":"ks2DTE","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/44` 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 made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises four categories of APIs: 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\nNote that the specific functionality of the `/api/v1/cards/44` endpoint is unclear — the description is simply \"Premium API Access\" with no further documentation about what data or service it returns. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional content, so there is no detailed schema, parameter documentation, or example responses available. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation makes it difficult to know exactly what this particular endpoint does.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","no-api-key","no-rate-limit","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":["The specific functionality of /api/v1/cards/44 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, request schema, or response schema is available.","Cannot verify what data or service this endpoint actually returns without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/44","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/44","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 x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example requests or responses, and the purpose of /api/v1/cards/44 is entirely opaque. The docs/pricing/API pages are empty beyond a wallet-connect 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'/request':17,34,162 '0.02':16,33,78,93,161 '000':84 '20':83 '402':234 '402 payment api' '6':91 'access':45,73,182 'addit':212 'advertis':116 'ai':10,27,128 'analysi':132 'analyt':122 'api':4,21,41,72,104,120,181,198 'avail':225 'base':7,24,61,85 'base network api' 'behind':51 'broader':114 'call':80 'categori':118 'challeng':235 'classif':135 'confirm':229 'connect':207 'content':213 'convers':152 'cost':75 'data':9,26,121,125,189 'decim':92 'descript':177 'detail':218 'difficult':243 'doc':195 'document':186,221,240 'embed':136 'endpoint':14,31,50,65,155,173,227,250 'estim':146 'exact':100,246 'exampl':223 'exchang':141 'export':126 'feed':140 'financ':11,28,137 'four':117 'function':169 'gas':145 'gate':3,20,44 'generat':153 'geocod':150 'infrastructur':148 'insight':127 'json-response' 'key':105 'know':245 'lack':238 'learn':130 'limit':108 'list':69,157 'live':230 'low payment fee' 'lowpaymentfee.com':35 'machin':129 'made':96 'make':241 'marketplac':42 'maxamountrequir':81 'metric':123 'micropay':55 'micropayment api' 'network':62 'no-api-key' 'no-rate-limit' 'note':165 'offer':8,25 'page':199 'paramet':220 'particular':249 'pay-per-request api' 'payment':94 'per':53,79 'per-request':52 'per-request-micropayment' 'platform':5,22,115 'point':164 'premium':71,180 'price':139,163,196 'prompt':209 'protocol':40 'quot':144 'rate':107,142 'render':204 'report':124 'request':54 'requir':112 'respons':224 'return':193,231 'schema':219 'scheme':101 'sentiment':131 'servic':191 'settl':56 'simpli':179 'site':202 'specif':64,168 'subscript':111 'summar':134 'text':133 'token':143 'unclear':175 'unit':86 'usdc':58,88 'usdc api access' 'usdc-base' 'util':13,30,149 'valid':151,233 'varieti':48 'via':97 'wallet':208 'web3':138 'x402':2,19,39,99 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"326402c4-8943-4bf7-8e8a-9fa4c8b92e46","listingId":"228a24c5-0910-4f24-8a52-c5cc3dafe6d7","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:33.425Z"}],"sources":[{"listingId":"228a24c5-0910-4f24-8a52-c5cc3dafe6d7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:33.425Z","lastSeenAt":"2026-04-23T04:31:07.593Z"}],"details":{"listingId":"228a24c5-0910-4f24-8a52-c5cc3dafe6d7","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base).\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/44\n# Returns 402 with x402 challenge JSON.\n# Use an x402-compatible client to attach payment and receive the response.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/44"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/44"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without needing API key registration or subscriptions","Making one-off micropayment-gated API calls from autonomous agents","Paying per-request for utility or data services settled on Base L2"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","x402-compatible clients that can settle USDC payments on Base","Use cases requiring low-cost per-call pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.978Z"},"updatedAt":"2026-04-23T04:31:07.593Z"}}