{"id":"379ec762-0052-4e62-8e45-27b2d18b6207","shortId":"jEhNaC","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and utility/infrastructure categories. Each call costs $0.02 in USDC on the Base network, settled on-chain with no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/payments/11` is listed as \"Premium API Access.\" The x402 challenge confirms it is live, accepting POST requests and requiring an exact payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. The payment is directed to address 0x1A2B…85F3 with a 300-second timeout. The response MIME type is application/json.\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 data generation — all at the same $0.02/request price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain undocumented.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","post-method","on-chain-settlement"],"categories":["api-gateway","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","base usdc api","lowpaymentfee"],"warnings":["The specific purpose and response format of /api/v1/payments/11 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, pricing, README) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, request schema, or response schema is available — callers cannot know what to send or what to expect back.","The broad catalog of endpoints listed on the homepage (AI, finance, utils) could not be verified for actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/11","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/payments/11","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 network details, but the endpoint's actual functionality (what \"Premium API Access\" returns) is completely undocumented. All doc/pricing/README pages return only a wallet-connect prompt with no content. No request or response schemas are 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'/request':13,28,174 '0.02':12,27,62,123,173 '000':112 '0x1a2b':130 '0x8335':117 '20':111 '2913':118 '300':134 '85f3':131 'accept':102 'access':7,22,94 'across':50 'actual':195 'address':129 'advertis':146 'ai/ml':53 'analysi':150 'analyt':52 'api':6,21,37,75,93 'application/json':142 'base':9,24,67,113,120 'base usdc api' 'behavior':196 'broad':42 'broader':144 'call':4,19,60 'catalog':43 'categori':58 'chain':72 'challeng':97 'classif':153 'commit':83 'confirm':98 'connect':186 'content':192 'convers':165 'cost':61 'data':51,167 'direct':127 'doc':180 'document':178 'embed':154 'enabl':36 'endpoint':49,86,147,202 'equal':122 'estim':162 'exact':108 'exchang':157 'feed':156 'finance/web3':55 'gas':161 'generat':168 'geocod':163 'howev':177 'infer':54 'json-response' 'key':76 'limit':79 'list':90 'live':101 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'micropayment api' 'mime':139 'network':68 'no-api-key' 'offer':40 'on-chain':70 'on-chain-settlement' 'page':179 'pay':2,17,46 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':45 'payment':109,125 'per':3,18,47 'platform':38,145 'point':176 'post':103 'post-method' 'premium':5,20,92 'price':155,175,181 'prompt':188 'quot':160 'rate':78,158 'readm':182 'remain':203 'request':48,104 'requir':106 'respons':138,198 'return':183 'schema':199 'second':135 'sentiment':149 'settl':69 'specif':85 'substant':191 'summar':152 'text':151 'timeout':136 'token':159 'type':140 'undocu':204 'unit':114 'upfront':82 'usdc':15,30,64,116 'usdc-base' 'utility/infrastructure':57 'valid':164 'via':10,25 'wallet':187 'x402':11,26,35,96 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"5d2aef72-89b7-49fa-9883-539e0ae37110","listingId":"379ec762-0052-4e62-8e45-27b2d18b6207","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/payments/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:20.860Z"}],"sources":[{"listingId":"379ec762-0052-4e62-8e45-27b2d18b6207","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:20.860Z","lastSeenAt":"2026-04-23T19:01:17.103Z"}],"details":{"listingId":"379ec762-0052-4e62-8e45-27b2d18b6207","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/11 \\\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/payments/11"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/11"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Catalog includes endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Paying per-call for miscellaneous utility or data endpoints via USDC on Base","Testing x402 payment flows with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","AI agents needing keyless, pay-as-you-go API access","Low-volume consumers who want no subscription commitment"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users who need detailed API documentation or response schema guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:10.144Z"},"updatedAt":"2026-04-23T19:01:17.103Z"}}