{"id":"3407a352-75ba-48d4-a770-9eb538260d2d","shortId":"bAtqCL","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/item/34` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call. The platform also hosts endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. The x402 challenge was successfully captured, confirming the endpoint is live and accepting POST requests.\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 description of what `/api/v1/item/34` actually returns. The endpoint name \"Premium API Access\" is generic and does not clarify its function. Prospective callers should be aware that without documentation, the actual behavior of this specific endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The purpose and expected input/output of /api/v1/item/34 ('Premium API Access') is unknown","No OpenAPI schema or request/response examples provided","Cannot verify what data or service this specific endpoint delivers"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/34","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/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The specific endpoint's purpose ('Premium API Access') is entirely opaque. This is effectively a stub 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'/request':12,28 '0.02':11,27,120,152 '000':114 '20':113 'Base network API' 'USDC API' 'accept':167 'access':107,214 'across':47 'actual':207,232 'ai/ml':50 'also':125 'analysi':130 'analyt':49 'api':5,14,21,30,39,78,106,176,213 'attach':89 'awar':227 'base':8,24,68,115 'base-network' 'behavior':233 'call':4,20,122 'caller':87,224 'captur':160 'challeng':157 'clarifi':220 'classif':133 'commit':86 'confirm':161 'connect':185 'content':191 'convers':145 'crypto-paid API' 'data':48,53 'descript':203 'detail':202 'doc':175 'document':170,230 'embed':134 'enabl':38 'endpoint':46,58,99,127,163,210,237 'estim':142 'exampl':199 'exchang':137 'extrem':172 'feed':136 'finance/web3':52 'function':222 'gas':141 'generat':147 'generic':216 'geocod':143 'header':93 'host':126 'i.e':119 'infer':51 'json-response' 'key':15,31,79 'limit':82 'list':103 'live':165 'lowpaymentfee' 'lowpaymentfee.com':33 'marketplac':40 'maximum':111 'micropayment API' 'name':211 'network':69 'no-api-key' 'offer':42 'openapi':195 'page':180 'pay':2,18,61 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':60 'payment':92 'per':3,19,62,121 'platform':6,22,124 'point':154 'post':168 'post-method' 'premium':105,212 'price':135,153,177 'prompt':187 'prospect':223 'protocol':74 'quot':140 'rate':81,138 'readm':179 'render':182 'request':63,96,169 'request/response':198 'requir':16,32,109 'return':208 'schema':196 'sentiment':129 'servic':56 'settl':70 'simpli':88 'spars':173 'specif':98,236 'subscript':85 'success':159 'summar':132 'text':131 'token':139 'unit':116 'unknown':239 'usdc':65,118 'usdc-settlement' 'use':64 'util':55 'valid':144 'varieti':44 'via':9,25,71 'wallet':186 'without':229 'x402':10,26,37,73,91,156 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"67ffe99d-166c-4e0b-888a-e691e4d324c2","listingId":"3407a352-75ba-48d4-a770-9eb538260d2d","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/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:38.596Z"}],"sources":[{"listingId":"3407a352-75ba-48d4-a770-9eb538260d2d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:38.596Z","lastSeenAt":"2026-04-23T20:01:27.519Z"}],"details":{"listingId":"3407a352-75ba-48d4-a770-9eb538260d2d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/34 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/item/34"},{"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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:46:08.204Z"},"updatedAt":"2026-04-23T20:01:27.519Z"}}