{"id":"f6df429d-ed0d-495c-93f9-ed8daaffaf4b","shortId":"8cpZrS","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 marketplace that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Each endpoint costs $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/44` 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…) on Base, which equals $0.02 (USDC uses 6 decimals). Payment is settled on-chain to the specified wallet address with a 300-second timeout window.\n\nThe broader platform advertises additional endpoints including 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 per-call price point. Documentation pages exist but appear to require wallet connection to view, so detailed request/response schemas for individual endpoints are not available from the crawl.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-base","api-key-generation","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","pay per call API","x402 API marketplace","USDC API access","Base network API","micropayment API","crypto API gateway"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only a 'Connect wallet' prompt with no visible content — detailed API docs are inaccessible.","No OpenAPI or schema information is available; request and response formats for this endpoint are unknown.","The specific function of /api/v1/apikeys/44 ('Premium API Access') is not clearly documented — it may generate API keys or serve another purpose.","The broader platform lists many endpoints but none have been individually verified beyond this one."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/44","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/44","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 all resolve to a wallet-connect prompt with no actual content. No OpenAPI schema, no request/response examples, and no detailed docs are available. The purpose of the specific /api/v1/apikeys/44 endpoint is unclear beyond the generic 'Premium API Access' 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'0.02':12,28,61,115,167 '000':105 '0x8335':110 '20':104 '300':133 '6':118 'Base network API' 'USDC API access' 'accept':97 'access':90 'across':47 'addit':141 'address':130 'advertis':140 'ai':50 'ai-inference' 'analysi':145 'analyt':49 'api':5,21,39,73,89 'api-key-generation' 'appear':177 'avail':193 'base':9,25,69,91,106,112 'broader':138 'call':4,20,170 'chain':125 'challeng':95 'charg':101 'classif':148 'classification' 'commit':78 'connect':181 'convers':160 'cost':60 'crawl':196 'crypto API gateway' 'crypto-quotes' 'data':48 'data-analytics' 'decim':119 'detail':185 'document':173 'embed':149 'embeddings' 'enabl':38 'endpoint':46,59,82,142,190 'equal':114 'estim':157 'exchang':152 'exist':175 'feed':151 'financ':53 'finance-data' 'gas':156 'generat':7,23,162 'geocod':158 'geocoding' 'includ':143 'individu':189 'infrastructur':56 'key':6,22,74 'learn':52 'limit':76 'list':86 'low payment fee' 'lowpaymentfee.com':33 'machin':51 'marketplac':40 'micropayment API' 'network':70 'offer':42 'on-chain':123 'page':174 'paid':64 'pay':2,18 'pay per call API' 'pay-per-cal':1,17 'payment':120 'per':3,13,19,29,62,169 'per-cal':168 'per-call-pricing' 'platform':139 'point':172 'post':98 'premium':88 'price':150,171 'quot':155 'rate':75,153 'request':14,30,63,99 'request/response':186 'requir':79,179 'schema':187 'second':134 'sentiment':144 'sentiment-analysis' 'settl':122 'specif':81 'specifi':128 'summar':147 'text':146 'text-summarization' 'timeout':135 'token':154 'unit':107 'usdc':16,32,66,109,116 'usdc-base' 'use':117 'util':57 'utility-services' 'valid':159 'varieti':44 'via':10,26 'view':183 'wallet':129,180 'web3':54 'window':136 'x402':11,27,37,94 'x402 API marketplace' 'x402-enabled':36 'x402-payment'","prices":[{"id":"2fc44db5-3cd9-4aa7-8ed6-1563265bc05e","listingId":"f6df429d-ed0d-495c-93f9-ed8daaffaf4b","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:25.308Z"}],"sources":[{"listingId":"f6df429d-ed0d-495c-93f9-ed8daaffaf4b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:25.308Z","lastSeenAt":"2026-04-22T12:04:51.501Z"}],"details":{"listingId":"f6df429d-ed0d-495c-93f9-ed8daaffaf4b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/44 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/44"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments","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"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/44"}],"useCases":["Agents purchasing one-off API access without needing pre-provisioned keys","Pay-per-call AI inference (sentiment, summarization, classification, embeddings)","On-demand financial data retrieval (prices, exchange rates, gas estimates)","Utility operations like geocoding, validation, and data conversion"],"bestFor":["AI agents needing frictionless, keyless API access via x402","Developers who want pay-as-you-go pricing without subscriptions","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume batch processing where per-call pricing becomes expensive","Users without a Base-compatible wallet or USDC holdings","Applications requiring detailed SLAs or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.35Z"},"updatedAt":"2026-04-22T12:04:51.501Z"}}