{"id":"95c07bff-2374-44fc-844a-17c50aa5fee3","shortId":"uJAcy2","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API provider offering a broad catalog of pay-per-call endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/cards/7` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (i.e., $0.02) per request. The x402 challenge was successfully captured, confirming the endpoint is live and accepting POST requests.\n\nThe provider's landing page 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 $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\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 documentation for any endpoint, including `/api/v1/cards/7`. The purpose and output of the specific `/api/v1/cards/7` endpoint is unclear from available materials; the name \"Premium API Access\" does not indicate what data or functionality it provides. Without documentation or example payloads, agents will need to experiment to determine the endpoint's actual behavior.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","misc"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","402 payment endpoint"],"warnings":["No documentation available: /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.","The purpose and response format of /api/v1/cards/7 ('Premium API Access') is completely undocumented and unclear.","No OpenAPI schema or request/response examples are provided by the provider.","No robots.txt or agents.txt found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/7","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation for the /api/v1/cards/7 endpoint — no schema, no examples, no description of what it returns. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt. The endpoint's actual purpose is 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'/api/v1/cards/7':61,201,209 '/docs':168 '/pricing':170 '/readme':172 '/request':16,32 '0.02':15,31,82,148 '000':76 '20':75 '402 payment endpoint' 'Base network API' 'USDC micropayment API' 'accept':97 'access':67,220 'actual':245 'advertis':105 'agent':235 'ai':9,25,117 'analysi':121 'analyt':8,24,111 'api':4,20,39,66,109,153,219 'avail':214 'base':7,23,56,77 'base-network' 'behavior':246 'broad':43 'call':49 'captur':90 'catalog':44 'categori':107 'challeng':87 'classif':124 'commit':161 'confirm':91 'connect':178 'content':184 'convers':141 'data':110,114,225 'detail':195 'determin':241 'document':163,196,231 'embed':125 'endpoint':13,29,50,60,93,144,199,210,243 'estim':135 'exampl':192,233 'exchang':130 'experi':239 'export':115 'extrem':165 'feed':129 'financ':10,26,126 'four':106 'function':227 'gas':134 'gate':3,19 'generat':142 'geocod':139 'i.e':81 'includ':200 'indic':223 'infrastructur':137 'insight':116 'key':154 'land':103 'learn':119 'limit':157 'list':63,146 'live':95 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':118 'materi':215 'metric':112 'minimum':160 'name':217 'need':237 'network':57 'no-api-key' 'offer':41 'openapi':188 'output':205 'page':104,173 'pay':47 'pay-per-cal':46 'pay-per-call API' 'pay-per-request' 'payload':234 'payment':71 'per':48,83,149 'post':98 'post-method' 'premium':65,218 'premium API access' 'price':128 'prompt':180 'protocol':38 'provid':40,101,229 'purpos':203 'quot':133 'rate':131,156 'render':175 'report':113 'request':84,99,150 'request/response':191 'requir':69,162 'schema':189 'sentiment':120 'settl':51 'spars':166 'specif':59,208 'success':89 'suit':5,21 'summar':123 'text':122 'token':132 'unclear':212 'unit':78 'usdc':53,80 'usdc-settlement' 'util':12,28,138 'valid':140 'wallet':179 'web3':127 'without':230 'x402':2,18,37,86 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':36","prices":[{"id":"a1f4c0ea-bd94-4ebf-a64e-88ebca2bd925","listingId":"95c07bff-2374-44fc-844a-17c50aa5fee3","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:49.766Z"}],"sources":[{"listingId":"95c07bff-2374-44fc-844a-17c50aa5fee3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:49.766Z","lastSeenAt":"2026-04-22T10:01:40.729Z"}],"details":{"listingId":"95c07bff-2374-44fc-844a-17c50aa5fee3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/7 \\\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/7"},{"claim":"All 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 USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/7"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven API consumption settled via x402 USDC micropayments on Base","Exploring a multi-category API catalog (analytics, AI, finance, utilities) with per-request billing"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, pay-as-you-go API access","Prototyping workflows that need cheap per-call pricing without signup"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request crypto settlement adds overhead","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.139Z"},"updatedAt":"2026-04-22T10:01:40.729Z"}}