{"id":"e22c15df-5f69-4e82-a06d-88144ca4d36d","shortId":"KhU7y3","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are paid per-request using USDC on the Base network, with no API keys, rate limits, or upfront commitments required. The specific endpoint at `/api/v1/item/28` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call.\n\nThe platform advertises four main 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 are priced uniformly at $0.02 per request.\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 schema, no request/response examples, and no description of what the `/api/v1/item/28` endpoint specifically returns. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what input it expects or what output it produces beyond `application/json`.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","no-api-key","json-response","pay-per-use"],"categories":["api-platform","misc"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","premium api access"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or schema describing request inputs or response outputs","The specific purpose of /api/v1/item/28 ('Premium API Access') is undefined — it is unclear what data or service it provides","No robots.txt or agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/28","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/item/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but documentation is essentially nonexistent — every docs/pricing/README page shows only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what /api/v1/item/28 actually does beyond the generic label 'Premium API Access'. The listing is effectively a 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'/request':13,32 '0.02':12,31,112,161 '000':106 '20':105 '402':100 'access':96 'across':54 'advertis':117 'ai':130 'ai/ml':57 'analysi':134 'analyt':56,124 'api':5,17,24,36,45,78,95,122,170 'application/json':232 'base':8,27,74,107 'base network api' 'beyond':231 'broad':50 'call':4,23,114 'catalog':51 'categori':120 'challeng':101,215 'classif':137 'commit':84 'connect':179 'convers':154 'data':55,123,127 'descript':197 'detail':186 'doc':169 'document':164,218 'embed':138 'enabl':44 'endpoint':53,64,88,202,206 'estim':148 'exampl':194 'exchang':143 'expect':225 'export':128 'extrem':166 'feed':142 'financ':139 'finance/web3':59 'four':118 'gas':147 'generat':155 'geocod':152 'i.e':111 'infer':58 'infrastructur':150 'input':223 'insight':129 'json-response' 'key':18,37,79 'learn':132 'limit':81 'list':92 'live':208 'low payment fee' 'lowpaymentfee.com':39 'machin':131 'main':119 'metric':125 'micropayment api' 'network':9,28,75 'no-api-key' 'offer':48 'openapi':190 'output':228 'page':174 'paid':66 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-use' 'per':3,22,68,113,162 'per-request':67 'per-request-billing' 'platform':6,25,46,116 'premium':94 'premium api access' 'price':141,158,171 'produc':230 'prompt':181 'quot':146 'rate':80,144 'readm':173 'render':176 'report':126 'request':69,102,163 'request/response':193 'requir':19,38,85 'respond':210 'return':98,204 'schema':191 'sentiment':133 'servic':62 'spars':167 'specif':87,203 'summar':136 'technic':185 'text':135 'token':145 'unclear':221 'uniform':159 'unit':108 'upfront':83 'usdc':15,34,71,110 'usdc api' 'usdc-base-network' 'use':70 'util':61,151 'valid':153,213 'via':10,29 'wallet':180 'web3':140 'without':217 'x402':11,30,43,214 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"990e2847-d84c-4112-8ed1-b9a7e1467f9d","listingId":"e22c15df-5f69-4e82-a06d-88144ca4d36d","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/item/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:21.627Z"}],"sources":[{"listingId":"e22c15df-5f69-4e82-a06d-88144ca4d36d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:21.627Z","lastSeenAt":"2026-04-22T13:30:26.656Z"}],"details":{"listingId":"e22c15df-5f69-4e82-a06d-88144ca4d36d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/28 \\\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":"All endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/item/28 requests up to 20,000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/item/28"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Exploring x402 protocol integrations for automated payments"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless API access with crypto micropayments","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads requiring SLAs or guaranteed uptime","Users without a Base network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.928Z"},"updatedAt":"2026-04-22T13:30:26.656Z"}}