{"id":"cba0abf3-f0e8-40c9-b381-e3c8717c244f","shortId":"SgsZrn","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-enabled API platform that exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, 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 pay-per-call at $0.02 each, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/cards/56` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind `/api/v1/cards/56` is unclear from the available material; the generic \"Premium API Access\" label does not describe what data or service it provides.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post","no-api-key","no-rate-limit"],"categories":["api-platform","finance","llm","geo","data"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","base network api","usdc api access","402 payment api"],"warnings":["No OpenAPI or schema documentation available — all docs pages render only 'Connect wallet'","The specific purpose of /api/v1/cards/56 ('Premium API Access') is not described anywhere","No request body schema or response schema documented","The broader catalog lists many endpoints but none have documented input/output formats"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/56","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is virtually no documentation: no OpenAPI spec, no request/response schemas, no examples, and the docs pages are empty. The purpose of /api/v1/cards/56 specifically is unclear. Pricing is clear ($0.02/request in USDC on 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'/api/v1/cards/56':109,210 '/docs':174 '/pricing':176 '/readme':178 '/request':17,34 '0.02':16,33,93,136 '000':125 '0x8335':130 '20':124 '2913':131 '402':119 '402 payment api' 'accept':159 'access':115,221 'across':50 'actual':207 'addit':189 'ai':10,27,59 'analysi':63 'analyt':54 'api':4,21,41,114,147,220 'application/json':164 'avail':205,215 'base':7,24,100,126,133 'base network api' 'behind':209 'beyond':166 'broad':46 'call':91 'catalog':47 'categori':52 'challeng':120 'classif':66 'commit':155 'connect':184 'convers':83 'data':9,26,53,227 'describ':225 'detail':191 'document':165,200 'embed':67 'enabl':40 'endpoint':14,31,49,86,108,158 'equal':135 'estim':77 'exact':143 'exampl':203 'exchang':72 'export':57 'expos':44 'extrem':171 'feed':71 'financ':11,28,68 'four':51 'function':208 'gas':76 'gate':3,20 'generat':84 'generic':218 'geocod':81 'http':160 'http-post' 'infrastructur':79 'insight':58 'json-response' 'key':148 'label':222 'land':168 'learn':61 'limit':151 'list':111 'low payment fee' 'lowpaymentfee.com':35 'machin':60 'made':139 'materi':216 'metric':55 'micropayment api' 'network':101 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':195 'page':169,179 'pay':89 'pay per call api' 'pay-per-cal':88 'pay-per-request' 'payload':204 'payment':137 'per':90 'platform':5,22,42 'post':161 'premium':113,219 'price':70 'prompt':186 'protocol':105 'provid':231 'quot':75 'rate':73,150 'render':181 'report':56 'request':121 'request/response':198 'requir':156 'return':117,163 'schema':199 'scheme':144 'sentiment':62 'servic':229 'settl':95 'spars':172 'spec':196 'specif':107 'summar':65 'technic':190 'text':64 'token':74 'unclear':212 'unit':127 'upfront':154 'usdc':97,129 'usdc api access' 'usdc-base' 'util':13,30,80 'valid':82 'via':102,140 'wallet':185 'web3':69 'x402':2,19,39,104,142 'x402 api' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"5452a98a-0efb-4f40-a162-9a7ea3b34f36","listingId":"cba0abf3-f0e8-40c9-b381-e3c8717c244f","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:43.699Z"}],"sources":[{"listingId":"cba0abf3-f0e8-40c9-b381-e3c8717c244f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:43.699Z","lastSeenAt":"2026-04-23T11:03:18.513Z"}],"details":{"listingId":"cba0abf3-f0e8-40c9-b381-e3c8717c244f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/56 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requesting up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/56"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/56"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Micropayment-gated data retrieval settled in USDC on Base","Programmatic access to analytics, AI inference, finance data, or utility services at $0.02/call"],"bestFor":["AI agents with x402-compatible wallets looking for frictionless API access","Developers wanting pay-as-you-go endpoints with no subscription","Use cases requiring low-cost per-request pricing on Base L2"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume batch workloads where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.5Z"},"updatedAt":"2026-04-23T11:03:18.513Z"}}