{"id":"58ecff05-c15f-4de7-be98-19db880b0498","shortId":"kAdZCS","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/46` 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 `/api/v1/cards/46` is not documented beyond the generic \"Premium API Access\" label, so its exact purpose is unclear.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed endpoint documentation available from the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is difficult to know what data or service this specific card endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee","402 payment endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for this endpoint","The specific functionality of /api/v1/cards/46 ('Premium API Access') is not described anywhere","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/46","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/46","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 x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/cards/46 is undocumented. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':17,34,156 '0.02':16,33,78,155 '000':82 '20':81 '402':227 '402 payment endpoint' '6':88 'Base USDC API' 'access':45,73,172 'advertis':111 'ai':10,27,123 'analysi':127 'analyt':117 'api':4,21,41,72,99,115,171,186 'avail':215 'base':7,24,61,83 'behind':51,162 'beyond':167 'broader':109 'call':80 'card':244 'categori':113 'challeng':229 'classif':130 'confirm':222 'connect':195 'content':201 'convers':147 'cost':75 'crawl':218 'data':9,26,116,120,239 'decim':89 'detail':212 'difficult':235 'doc':185 'document':166,180,214,232 'embed':131 'endpoint':14,31,50,65,151,213,220,245 'estim':141 'exact':96,176 'exampl':209 'exchang':136 'export':121 'extrem':182 'feed':135 'financ':11,28,132 'four':112 'function':161 'gas':140 'gate':3,20,44 'generat':148 'generic':169 'geocod':145 'handl':92 'howev':158 'infrastructur':143 'insight':122 'json-api' 'key':100 'know':237 'label':173 'learn':125 'limit':103 'list':69,150 'live':223 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':124 'marketplac':42 'metric':118 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':205 'page':190 'pay-per-request API' 'payment':90 'per':53,79 'per-request':52 'per-request-micropayment' 'platform':5,22,110 'premium':71,170 'price':134,157,187 'prompt':197 'proper':226 'protocol':40 'provid':246 'purpos':177 'quot':139 'rate':102,137 'readm':189 'render':192 'report':119 'request':54 'request/response':208 'requir':107 'return':224 'schema':206 'scheme':97 'sentiment':126 'servic':241 'settl':56 'share':152 'spars':183 'specif':64,160,243 'subscript':106 'summar':129 'text':128 'token':138 'unclear':179 'unit':84 'usdc':58,86 'usdc-base' 'util':13,30,144 'valid':146 'varieti':48 'via':93 'wallet':196 'web3':133 'without':231 'x402':2,19,39,95,228 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"82ea995f-f5b8-4828-aa46-0e040cb3354f","listingId":"58ecff05-c15f-4de7-be98-19db880b0498","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:36.403Z"}],"sources":[{"listingId":"58ecff05-c15f-4de7-be98-19db880b0498","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:36.403Z","lastSeenAt":"2026-04-23T04:01:14.203Z"}],"details":{"listingId":"58ecff05-c15f-4de7-be98-19db880b0498","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/46 \\\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/46"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/46"}],"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 services"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs 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":"2026-02-17T23:14:26.823Z"},"updatedAt":"2026-04-23T04:01:14.203Z"}}