{"id":"55155cb4-4974-4cf1-8481-fa2eba5cecee","shortId":"GSfWBJ","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/19` 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 endpoints are listed at the same $0.02/request price point. However, the specific endpoint `/api/v1/cards/19` does not clearly map to any of these named services — it may be a generic card-based resource or an internal identifier. No OpenAPI schema, detailed documentation, or example request/response payloads are available from the crawled pages (docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content).","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access","402 payment api"],"warnings":["No OpenAPI or schema documentation available — all doc pages return only 'Connect wallet' with no content","The endpoint path /api/v1/cards/19 does not correspond to any named API on the landing page; its actual functionality is unknown","No example request or response payloads are available to verify what this endpoint returns","Cannot confirm what data or service 'Premium API Access' actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/19","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation beyond a landing page listing, no example request/response payloads, and the specific resource at /api/v1/cards/19 is not described. The docs, pricing, and README pages are effectively 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'/request':17,34,157 '0.02':16,33,78,156 '000':82 '20':81 '402 payment api' '6':88 'access':45,73 'advertis':111 'ai':10,27,123 'ai-inference' 'analysi':127 'analyt':117 'api':4,21,41,72,99,115 'avail':198 'base':7,24,61,83,182 'base network api' 'behind':51 'broader':109 'call':80 'card':181 'card-bas':180 'categori':113 'classif':130 'classification' 'clear':167 'connect':212 'content':218 'convers':147 'cost':75 'crawl':201 'data':9,26,116,120 'data-analytics' 'decim':89 'detail':191 'doc':203 'document':192 'embed':131 'embeddings' 'endpoint':14,31,50,65,150,163 'estim':141 'exact':96 'exampl':194 'exchang':136 'export':121 'feed':135 'financ':11,28,132 'finance-data' 'four':112 'gas':140 'gate':3,20,44 'generat':148 'generic':179 'geocod':145 'geocoding' 'handl':92 'howev':160 'identifi':187 'infrastructur':143 'insight':122 'intern':186 'key':100 'learn':125 'limit':103 'list':69,152 'low payment fee' 'lowpaymentfee.com':35 'machin':124 'map':168 'marketplac':42 'may':176 'metric':118 'micropay':55 'micropayment api' 'name':173 'network':62 'offer':8,25 'openapi':189 'page':202,207 'pay-per-request api' 'payload':196 'payment':90 'per':53,79 'per-request':52 'per-request-micropayment' 'platform':5,22,110 'point':159 'premium':71 'price':134,158,204 'prompt':214 'protocol':40 'quot':139 'rate':102,137 'readm':206 'report':119 'request':54 'request/response':195 'requir':107 'resourc':183 'return':209 'schema':190 'scheme':97 'sentiment':126 'sentiment-analysis' 'servic':174 'settl':56 'specif':64,162 'subscript':106 'substant':217 'summar':129 'text':128 'text-summarization' 'token':138 'unit':84 'usdc':58,86 'usdc api access' 'usdc-base' 'util':13,30,144 'utility-apis' 'valid':146 'varieti':48 'via':93 'wallet':213 'web3':133 'x402':2,19,39,95 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"1107788c-6417-422c-8b09-d172ae800b6f","listingId":"55155cb4-4974-4cf1-8481-fa2eba5cecee","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:21.363Z"}],"sources":[{"listingId":"55155cb4-4974-4cf1-8481-fa2eba5cecee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:21.363Z","lastSeenAt":"2026-04-23T06:04:05.991Z"}],"details":{"listingId":"55155cb4-4974-4cf1-8481-fa2eba5cecee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/19 \\\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/19"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure utility API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/19"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a pay-per-call basis","Running data analytics queries and exporting reports with no subscription commitment","Using utility services like geocoding, validation, and format conversion via micropayments"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","Use cases requiring low-cost per-request billing without rate limits","Projects already operating on the Base network with USDC liquidity"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription discounts","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.603Z"},"updatedAt":"2026-04-23T06:04:05.991Z"}}