{"id":"6b3140c9-b85a-4890-856a-7d16b7ad07aa","shortId":"bEZWqn","kind":"x402","title":"Pay-per-call API key generation on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call API key generation on Base via x402 — $0.02 per request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint at `/api/v1/apikeys/45` is listed as \"Premium API Access.\" Based on the x402 challenge, it accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises 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/request price point. Documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schemas for this and other endpoints remain undocumented in the crawl material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","api-key-generation","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["infrastructure","llm","finance"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api access","base network api","crypto api payment"],"warnings":["Documentation pages (/docs, /pricing, /README) returned no usable content — only a 'Connect wallet' prompt.","No OpenAPI spec or request/response schema available for any endpoint.","The exact purpose and expected input/output of /api/v1/apikeys/45 ('Premium API Access') is not documented; it may differ from the other listed endpoints.","The broader platform lists many endpoints (AI, finance, utils) but none have documented schemas or example payloads in the crawl material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/45","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/apikeys/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but documentation pages are empty (only 'Connect wallet'), no OpenAPI spec is available, and request/response schemas are entirely absent. The purpose of the specific /apikeys/45 endpoint is unclear beyond its 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'/request':168 '0.02':12,28,63,118,167 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':132 '0x8335':112 '20':106 '2913':113 '300':135 '6':122 'accept':99 'access':92 'across':47 'actual':189 'address':131 'advertis':141 'ai':50 'ai-inference' 'analysi':145 'analyt':49 'api':5,21,39,75,91 'api-key-generation' 'base':9,25,71,93,108,115 'base network api' 'broader':139 'call':4,20 'chain':129 'challeng':97 'charg':103 'classif':148 'commit':80 'connect':179 'convers':160 'crawl':201 'crypto api payment' 'data':48 'data-analytics' 'decim':123 'detail':186 'doc':173 'document':171 'embed':149 'enabl':38 'endpoint':46,59,84,142,196 'equal':117 'estim':157 'exchang':152 'feed':151 'financ':53 'finance-data' 'gas':156 'generat':7,23,162 'geocod':158 'given':119 'infrastructur':56 'key':6,22,76 'learn':52 'limit':78 'list':88 'low payment fee' 'lowpaymentfee.com':33 'machin':51 'materi':202 'micropayment api' 'network':72 'offer':42 'on-chain':127 'page':172 'paid':66 'pay':2,18 'pay per call api' 'pay-per-cal':1,17 'pay-per-request' 'payment':124 'per':3,13,19,29,64 'platform':40,140 'point':170 'post':100 'premium':90 'price':61,150,169,174 'prompt':181 'quot':155 'rate':77,153 'readm':175 'remain':197 'request':14,30,65,101 'request/response':190 'requir':81 'return':176 'schema':191 'second':136 'sentiment':144 'settl':126 'specif':83 'summar':147 'technic':185 'text':146 'timeout':137 'token':154 'undocu':198 'unit':109 'usdc':16,32,68,111,120 'usdc api access' 'usdc-base' 'util':57 'utility-services' 'valid':159 'varieti':44 'via':10,26 'wallet':180 'web3':54 'web3-data' 'x402':11,27,37,96 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"808d5d32-8c51-492c-a451-af11b4c0d42f","listingId":"6b3140c9-b85a-4890-856a-7d16b7ad07aa","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/apikeys/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:33.179Z"}],"sources":[{"listingId":"6b3140c9-b85a-4890-856a-7d16b7ad07aa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:33.179Z","lastSeenAt":"2026-04-22T20:01:48.508Z"}],"details":{"listingId":"6b3140c9-b85a-4890-856a-7d16b7ad07aa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/45 \\\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 priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/apikeys/45"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/apikeys/45"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents purchasing one-off API access without managing API keys or subscriptions","Programmatic access to AI inference endpoints (sentiment, summarization, classification, embeddings) with per-call crypto payment","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates via micropayments","Using utility services like geocoding, validation, and data conversion on a pay-as-you-go basis"],"bestFor":["AI agents that need frictionless, keyless API access paid per call","Developers wanting to avoid subscription commitments for low-volume API usage","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-call pricing at $0.02 would be cost-prohibitive compared to bulk plans","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.036Z"},"updatedAt":"2026-04-22T20:01:48.508Z"}}