{"id":"e6185019-c10a-4826-9b89-c77006005d7c","shortId":"2hvZ8Z","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/75` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — 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 listed endpoints share the same $0.02/request pricing. However, the specific functionality behind the `/api/v1/cards/75` path is not documented — the name \"Premium API Access\" is generic and no schema, request format, or response format is provided for this particular endpoint.\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 examples, and no detailed description of what `/api/v1/cards/75` actually returns. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is difficult to know what data or service it provides.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","402 payment api"],"warnings":["The specific functionality of /api/v1/cards/75 is undocumented — 'Premium API Access' is a generic label with no details on what it returns.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no substantive content.","No OpenAPI spec, request schema, or response schema is available.","The platform lists many endpoint categories but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/75","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/75","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 with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the purpose of /api/v1/cards/75 is entirely unclear. The docs pages are empty. This is effectively a stub 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'/api/v1/cards/75':67,164,226 '/docs':195 '/pricing':197 '/readme':199 '/request':17,34,156 '0.02':16,33,78,155 '000':82 '20':81 '402':237 '402 payment api' '6':88 'access':45,73,173 'actual':227 'advertis':111 'ai':10,27,123 'analysi':127 'analyt':117 'api':4,21,41,72,99,115,172 'base':7,24,61,83 'base usdc api' 'base-network' 'behind':51,162 'broader':109 'call':80 'categori':113 'challeng':238 'classif':130 'confirm':232 'connect':205 'content':211 'convers':147 'cost':75 'data':9,26,116,120,248 'decim':89 'descript':223 'detail':222 'difficult':244 'document':168,190,241 'embed':131 'endpoint':14,31,50,65,151,189,230 'estim':141 'exact':96 'exampl':219 'exchang':136 'export':121 'extrem':192 'feed':135 'financ':11,28,132 'format':180,183 'four':112 'function':161 'gas':140 'gate':3,20,44 'generat':148 'generic':175 'geocod':145 'handl':92 'howev':158 'infrastructur':143 'insight':122 'json-response' 'key':100 'know':246 'learn':125 'limit':103 'list':69,150 'live':233 'low payment fee' 'lowpaymentfee.com':35 'machin':124 'marketplac':42 'metric':118 'micropay':55 'micropayment api' 'name':170 'network':62 'no-api-key' 'offer':8,25 'openapi':215 'page':200 'particular':188 'path':165 'pay-per-request api' 'payment':90 'per':53,79 'per-request':52 'per-request-billing' 'platform':5,22,110 'premium':71,171 'price':134,157 'prompt':207 'protocol':40 'provid':185,252 'quot':139 'rate':102,137 'render':202 'report':119 'request':54,179 'request/response':218 'requir':107 'respons':182 'return':228,234 'schema':178 'scheme':97 'sentiment':126 'servic':250 'settl':56 'share':152 'spars':193 'spec':216 'specif':64,160 'subscript':106 'substant':210 'summar':129 'text':128 'token':138 'unit':84 'usdc':58,86 'usdc-micropayment' 'util':13,30,144 'valid':146,236 'varieti':48 'via':93 'wallet':206 'web3':133 'without':240 'x402':2,19,39,95 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"c79b0cec-0559-4f7f-9ade-dd461234d0d8","listingId":"e6185019-c10a-4826-9b89-c77006005d7c","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:50.365Z"}],"sources":[{"listingId":"e6185019-c10a-4826-9b89-c77006005d7c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:50.365Z","lastSeenAt":"2026-04-23T03:01:27.991Z"}],"details":{"listingId":"e6185019-c10a-4826-9b89-c77006005d7c","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Use an x402-compatible client to pay and access:\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/75 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/75"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/75"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, 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-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.136Z"},"updatedAt":"2026-04-23T03:01:27.991Z"}}