{"id":"d4d4e755-1697-48a1-ae03-444ca7576d53","shortId":"2zP5W8","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","description":"lowpaymentfee.com offers a suite of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint is gated by the x402 payment challenge: callers attach a USDC payment on the Base network directly in the HTTP request header, with no API keys, accounts, or rate limits required.\n\nThe specific endpoint at `/api/v1/charges/399` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout window.\n\nThe provider's landing page lists additional endpoints across four categories: 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 (geocoding, validation, conversion, generation) — all at the same $0.02/request price point. Documentation pages beyond the landing page were largely empty (showing only a \"Connect wallet\" prompt), so detailed request/response schemas, parameter descriptions, and example payloads are not available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","premium-api-access"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-gated API","402 payment required"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all returned only 'Connect wallet' with no usable content.","No OpenAPI or schema available — request parameters and response format are unknown.","The specific purpose of /api/v1/charges/399 ('Premium API Access') is not described beyond its title; it may be a generic or placeholder endpoint.","No examples of successful responses are available from any source."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/399","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/charges/399","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 challenge with clear pricing. However, documentation pages are effectively empty (only 'Connect wallet'), there is no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/charges/399' specifically (vs. the other listed endpoints) is unclear. This is essentially a stub 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'/request':195 '0.02':10,28,128,194 '000':117 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '0x8335':122 '20':116 '2913':123 '300':143 '402 payment required' '6':133 'Base network API' 'USDC micropayment API' 'accept':105 'access':6,24,103 'account':88 'across':155 'addit':153 'address':139 'advertis':111 'ai':165 'ai/ml':53 'amount':114 'analysi':169 'analyt':52,159 'api':5,17,23,35,49,86,102 'attach':70 'avail':224 'base':8,26,76,118,125 'beyond':200 'call':130 'caller':69 'categori':157 'challeng':68,110 'classif':172 'connect':210 'convers':188 'crypto-gated API' 'data':51,56,158,162 'decim':134 'descript':218 'detail':214 'direct':78 'document':198 'embed':173 'empti':206 'endpoint':61,95,154 'equal':127 'estim':183 'everi':60 'exampl':220 'exchang':178 'export':163 'feed':177 'financ':174 'finance/web3':55 'four':156 'gas':182 'gate':3,21,63 'generat':189 'geocod':186 'header':83 'http':81 'infer':54 'infrastructur':185 'insight':164 'key':18,36,87 'land':150,202 'larg':205 'learn':167 'limit':91 'list':99,152 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':166 'maximum':113 'metric':160 'network':77 'no-api-key' 'offer':38 'page':151,199,203 'paramet':217 'pay':9,27,46 'pay-per-call API' 'pay-per-request':45 'payload':221 'payment':67,73,135 'per':11,29,47,129 'point':197 'post':106 'post-endpoint' 'premium':4,22,101 'premium-api-access' 'price':176,196 'prompt':212 'protocol':44 'provid':148 'quot':181 'rate':90,179 'report':161 'request':12,30,48,82,107 'request/response':215 'requir':92 'schema':216 'second':144 'sent':137 'sentiment':168 'servic':59 'show':207 'span':50 'specif':94 'suit':40 'summar':171 'text':170 'timeout':145 'token':180 'unit':119 'usdc':14,32,72,121,131 'usdc-base' 'use':132 'util':58 'valid':187 'wallet':211 'web3':175 'window':146 'x402':2,20,43,66,109 'x402 API' 'x402-gated':1,19 'x402-payment' 'x402-protocol':42","prices":[{"id":"cdd67e0b-be9e-45f9-8745-f078fcee1398","listingId":"d4d4e755-1697-48a1-ae03-444ca7576d53","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/charges/399","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:27.171Z"}],"sources":[{"listingId":"d4d4e755-1697-48a1-ae03-444ca7576d53","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/399","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:27.171Z","lastSeenAt":"2026-04-23T23:02:31.631Z"}],"details":{"listingId":"d4d4e755-1697-48a1-ae03-444ca7576d53","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/399 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/399"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/399"},{"claim":"All listed 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 provider 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 pre-registering for API keys","Programmatic access to premium data or services with per-call USDC micropayments","Integrating pay-as-you-go endpoints into autonomous agent workflows on Base"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","AI agents with Base USDC wallets needing frictionless endpoint consumption","Projects that prefer crypto-native micropayments over subscription billing"],"notFor":["Users without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or subscription discounts","Anyone requiring detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.529Z"},"updatedAt":"2026-04-23T23:02:31.631Z"}}