{"id":"466bc6e2-a01d-4f75-9a28-b220b587babb","shortId":"dwxnBF","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 `/api/v1/cards/95` is listed as \"Premium API Access\" and costs $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 upfront commitments are required. The caller simply includes an X-PAYMENT header with a valid payment proof.\n\nThe broader platform advertises four categories of endpoints: 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.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind `/api/v1/cards/95` (\"Premium API Access\") is not described beyond its title, making it unclear what data or service it returns. The endpoint is confirmed live via a valid 402 challenge.","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 API documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/cards/95 ('Premium API Access') is not described anywhere","The broad range of advertised endpoints (AI, finance, data, utils) cannot be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/95","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/95","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 via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/cards/95 is entirely undescribed. This is effectively a stub 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'/api/v1/cards/95':63,209 '/docs':173 '/pricing':175 '/readme':177 '/request':17,34,166 '0.02':16,33,72,165 '000':76 '20':75 '402':236 '402 payment api' '6':82 'access':69,212 'advertis':121 'ai':10,27,133 'ai-inference' 'analysi':137 'analyt':127 'api':4,21,40,68,93,211 'avail':204 'base':7,24,58,77 'base network api' 'behind':48,208 'beyond':216 'broader':119 'call':74 'caller':105 'categori':123 'challeng':237 'classif':140 'classification' 'commit':101 'confirm':231 'connect':183 'convers':157 'cost':71 'data':9,26,126,130,223 'data-analytics' 'decim':83 'describ':215 'detail':190 'document':168,199 'embed':141 'embeddings' 'endpoint':14,31,47,62,125,161,229 'estim':151 'exact':90 'exampl':202 'exchang':146 'export':131 'extrem':170 'feed':145 'financ':11,28,142 'finance-data' 'four':122 'function':207 'gas':150 'gate':3,20,43 'generat':158 'geocod':155 'geocoding' 'handl':86 'header':112 'includ':107 'infrastructur':153 'insight':132 'key':94 'learn':135 'limit':97 'list':65,160 'live':232 'low payment fee' 'lowpaymentfee.com':35 'machin':134 'make':219 'marketplac':41 'metric':128 'micropay':52 'micropayment api' 'network':59 'offer':8,25 'openapi':194 'page':178 'pay-per-request api' 'payload':203 'payment':84,111,116 'per':50,73 'per-request':49 'per-request-micropayment' 'platform':5,22,120 'premium':67,210 'price':144,167 'prompt':185 'proof':117 'protocol':39 'quot':149 'rate':96,147 'render':180 'report':129 'request':51 'request/response':197 'requir':103 'return':227 'schema':198 'scheme':91 'sentiment':136 'sentiment-analysis' 'servic':225 'settl':53 'share':162 'simpli':106 'spars':171 'spec':195 'specif':61,206 'summar':139 'technic':189 'text':138 'text-summarization' 'titl':218 'token':148 'unclear':221 'unit':78 'upfront':100 'usdc':55,80 'usdc api access' 'usdc-base' 'util':13,30,154 'utility-apis' 'valid':115,156,235 'varieti':45 'via':87,233 'wallet':184 'web3':143 'x':110 'x-payment':109 'x402':2,19,38,89 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"36db0b8d-3182-4fe1-9c23-6d7612dfd1d9","listingId":"466bc6e2-a01d-4f75-9a28-b220b587babb","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/95","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:55.788Z"}],"sources":[{"listingId":"466bc6e2-a01d-4f75-9a28-b220b587babb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/95","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:55.788Z","lastSeenAt":"2026-04-23T02:31:11.677Z"}],"details":{"listingId":"466bc6e2-a01d-4f75-9a28-b220b587babb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/95 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/95"},{"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 advertises four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/95"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations such as geocoding, validation, and data conversion with instant pay-per-use billing","Integrating data analytics and export capabilities into agent workflows via x402 micropayments"],"bestFor":["AI agents that need on-demand API access without pre-registration","Developers prototyping with multiple API categories under a single payment model","Low-volume or bursty workloads where per-request pricing avoids subscription overhead"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, schemas, or SLAs before integration","Applications requiring non-USDC or non-Base-network payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.896Z"},"updatedAt":"2026-04-23T02:31:11.677Z"}}