{"id":"48d07219-6649-4cde-88c6-17fd90586268","shortId":"HB3JB8","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 a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/39` 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 `X-PAYMENT` header with the \"exact\" scheme — no API keys, accounts, or rate limits are 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 per request price point.\n\nNote that the specific functionality behind `/api/v1/cards/39` is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and the docs, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it impossible to determine what data or service this particular card returns.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","no-api-key","no-rate-limit","json-response"],"categories":["api-marketplace","payments"],"synonyms":["x402 api","micropayment api","pay-per-request api","base network api","usdc api access","lowpaymentfee"],"warnings":["The specific functionality of /api/v1/cards/39 ('Premium API Access') is completely undocumented — it is unclear what data or service it provides.","All documentation pages (/docs, /pricing, /README, /api) return only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, no request schema, and no response examples are available.","Cannot verify what the endpoint actually returns without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/39","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge, but there is zero documentation on what /api/v1/cards/39 actually returns. No OpenAPI schema, no request/response examples, and all doc pages render only a 'Connect wallet' stub. The listing is effectively a 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'/request':17,34 '0.02':16,33,75,158 '000':79 '20':78 '402':215 '6':85 'access':70,178 'account':104 'addit':205 'advertis':113 'ai':10,27,125 'analysi':129 'analyt':119 'api':4,21,40,69,102,117,177 'base':7,24,58,80 'base network api' 'behind':48,168 'beyond':173 'broader':111 'call':77 'card':233 'categori':115 'challeng':216 'classif':132 'confirm':210 'connect':200 'content':206 'convers':149 'cost':72 'data':9,26,118,122,228 'decim':86 'determin':226 'doc':190 'document':172,221 'embed':133 'endpoint':14,31,47,62,152,208 'estim':143 'exact':99 'exampl':187 'exchang':138 'export':123 'feed':137 'financ':11,28,134 'four':114 'function':167 'gas':142 'gate':3,20,43 'generat':150 'generic':175 'geocod':147 'handl':89 'header':96 'imposs':224 'infrastructur':145 'insight':124 'json-response' 'key':103 'label':179 'lack':219 'learn':127 'limit':107 'list':66,154 'live':211 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':126 'make':222 'marketplac':41 'metric':120 'micropay':52 'micropayment api' 'minim':199 'network':59 'no-api-key' 'no-rate-limit' 'note':163 'offer':8,25 'openapi':183 'page':194 'particular':232 'pay-per-request api' 'payment':87,95 'per':50,76,159 'per-request':49 'per-request-micropayment' 'platform':5,22,112 'point':162 'premium':68,176 'price':136,161,191 'prompt':202 'proper':214 'protocol':39 'quot':141 'rate':106,139 'readm':193 'report':121 'request':51,160 'request/response':186 'requir':109 'resolv':196 'return':212,234 'schema':184 'scheme':100 'sentiment':128 'servic':230 'settl':53 'specif':61,166 'summar':131 'text':130 'token':140 'unit':81 'usdc':55,83 'usdc api access' 'usdc-base' 'util':13,30,146 'valid':148 'varieti':45 'via':90 'wallet':201 'web3':135 'x':94 'x-payment':93 'x402':2,19,38,92 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"fbe1bfa6-f904-45d8-b00d-673931181726","listingId":"48d07219-6649-4cde-88c6-17fd90586268","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:30.996Z"}],"sources":[{"listingId":"48d07219-6649-4cde-88c6-17fd90586268","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:30.996Z","lastSeenAt":"2026-04-23T04:01:13.951Z"}],"details":{"listingId":"48d07219-6649-4cde-88c6-17fd90586268","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/39 \\\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 x402Version 1, exact scheme, USDC on Base, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/cards/39"},{"claim":"All listed APIs 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":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/39"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing gated API endpoints without creating an account or managing API keys","Making one-off paid API calls from autonomous agents using x402 protocol","Paying per-request for data, AI inference, or utility services via USDC on Base"],"bestFor":["Developers or agents that want keyless, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.084Z"},"updatedAt":"2026-04-23T04:01:13.951Z"}}