{"id":"b916cb41-37aa-43f2-8d27-af34ccb9eae3","shortId":"6YeLac","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call, no API keys required.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a collection of endpoints spanning 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/products/14` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. The platform also exposes 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. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\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 the `/api/v1/products/14` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides beyond its name.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limit","data-analytics","ai-inference","finance-data","crypto-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content.","No OpenAPI or schema available — request and response formats are unknown.","The name 'Premium API Access' is generic; it is unclear what data or functionality this specific endpoint provides.","No examples of successful responses are available anywhere in the crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/14","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/products/14","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, confirming it accepts payments. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what 'Premium API Access' actually returns. The listing is a stub with pricing info 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'/call':12,28 '0.02':11,27,119,122,154 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':162 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':166 '20':113 '402':217 'Base network API' 'USDC API' 'access':107,231 'actual':208 'address':161 'ai-inference' 'ai/ml':50 'also':127 'analysi':132 'analyt':49 'api':5,14,21,30,39,78,106,175,230 'attach':89 'base':8,24,68,115,168 'beyond':233 'call':124 'caller':87 'challeng':218 'classif':135 'collect':44 'commit':86 'connect':184 'content':190 'contract':165 'convers':147 'crypto-data' 'crypto-paid API' 'data':48,53,226 'data-analytics' 'descript':202 'detail':201 'doc':174 'document':169,221 'embed':136 'enabl':38 'endpoint':46,58,99,129,207,211 'estim':144 'exampl':198 'exchang':139 'expos':128 'extrem':171 'feed':138 'finance-data' 'finance/web3':52 'function':228 'gas':143 'generat':149 'geocod':145 'header':93 'i.e':121 'infer':51 'key':15,31,79 'limit':82 'list':103 'live':213 'lowpaymentfee' 'lowpaymentfee.com':33 'made':159 'maximum':111 'micropayment API' 'name':235 'network':69 'no-api-key' 'no-rate-limit' 'offer':42 'openapi':194 'page':179 'pay':2,18,61 'pay-per-call API' 'pay-per-request':1,17,60 'payment':92,157 'per':3,19,62,123 'platform':6,22,40,126 'point':156 'premium':105,229 'price':137,155,176 'prompt':186 'protocol':74 'provid':232 'quot':142 'rate':81,140 'readm':178 'render':181 'request':4,20,63,96 'request/response':197 'requir':16,32,109 'return':209,214 'schema':195 'sentiment':131 'servic':56 'settl':70 'simpli':88 'span':47 'spars':172 'specif':98 'subscript':85 'summar':134 'text':133 'token':141 'unclear':224 'unit':116 'usdc':65,118,120,164 'usdc-base' 'use':64,163 'util':55 'utility-services' 'valid':146,216 'via':9,25,71 'wallet':185 'without':220 'x402':10,26,37,73,91 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"8ad649af-9b6e-485d-ba3b-6bec0ed3a395","listingId":"b916cb41-37aa-43f2-8d27-af34ccb9eae3","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/products/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:16.201Z"}],"sources":[{"listingId":"b916cb41-37aa-43f2-8d27-af34ccb9eae3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:16.201Z","lastSeenAt":"2026-04-23T20:31:57.754Z"}],"details":{"listingId":"b916cb41-37aa-43f2-8d27-af34ccb9eae3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/14 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/14"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/14"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Paying per-request for analytics, AI inference, or financial data via USDC on Base","Integrating low-cost utility endpoints (geocoding, validation, conversion) into automated workflows"],"bestFor":["Developers and agents wanting frictionless, keyless API access via crypto micropayments","Low-volume or bursty workloads where per-call pricing is more economical than subscriptions","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without access to USDC on the Base network","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.184Z"},"updatedAt":"2026-04-23T20:31:57.754Z"}}