{"id":"4d2c20b3-62b6-42b5-81c8-0f52c09ff45f","shortId":"NQC7YT","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/140` is listed as \"Premium API Access\" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json. The payment timeout is 300 seconds.\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. However, the crawled documentation pages (docs, pricing, README) returned only wallet-connect stubs with no substantive content, so the actual behavior and response schemas of these endpoints remain undocumented. Without request/response examples or OpenAPI specs, the precise inputs and outputs for this endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — endpoint inputs and outputs are unknown","All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no substantive content","The specific purpose of /api/v1/charges/140 ('Premium API Access') is unclear and may be a generic or placeholder endpoint","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/140","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/140","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 payment details, but there is no OpenAPI spec, no request/response schema, no documentation content (all doc pages return only a wallet-connect stub), and the actual functionality behind 'Premium API Access' at /charges/140 is entirely 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'/request':13,28 '0.02':12,27,62,119 '000':108 '0x8335':113 '20':107 '2913':114 '300':143 '402 payment api' '6':123 'accept':133 'access':100 'account':74 'across':45 'actual':191 'advertis':102,148 'ai/ml':48 'amount':105 'analysi':152 'analyt':47 'api':5,20,37,72,99 'application/json':138 'attach':82 'base':8,23,69,109,116 'base network api' 'base-network' 'behavior':192 'broader':146 'call':4,19 'caller':80 'challeng':127 'classif':155 'confirm':128 'connect':183 'content':188 'convers':167 'crawl':173 'data':46,169 'decim':124 'doc':176 'document':174 'embed':156 'enabl':36 'endpoint':44,55,92,130,149,198,214 'equal':118 'estim':164 'exampl':203 'exchang':159 'feed':158 'finance/web3':50 'gas':163 'generat':170 'geocod':165 'given':120 'header':86 'howev':171 'infer':49 'infrastructur':52 'input':209 'json-response' 'key':73 'limit':77 'list':96 'live':132 'low payment fee' 'lowpaymentfee.com':31 'max':104 'micropayment api' 'network':9,24,70 'no-api-key' 'offer':40 'openapi':205 'output':211 'page':175 'pay':2,17,58 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':57 'payment':85,140 'per':3,18,59 'platform':6,21,38,147 'post':134 'post-method' 'precis':208 'premium':98 'price':157,177 'quot':162 'rate':76,160 'readm':178 'remain':199 'request':60,89,135 'request/response':202 'requir':79 'respons':194 'return':137,179 'schema':195 'second':144 'sentiment':151 'settl':64 'simpli':81 'spec':206 'specif':91 'stub':184 'substant':187 'summar':154 'text':153 'timeout':141 'token':161 'undocu':200 'unit':110 'unknown':216 'usdc':15,30,66,112,121 'usdc api' 'usdc-settlement' 'util':53 'valid':166 'varieti':42 'via':10,25 'wallet':182 'wallet-connect':181 'without':201 'x402':11,26,35,84,126 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"05d4c0a6-1584-4039-97ba-62485d76447d","listingId":"4d2c20b3-62b6-42b5-81c8-0f52c09ff45f","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/140","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:04.276Z"}],"sources":[{"listingId":"4d2c20b3-62b6-42b5-81c8-0f52c09ff45f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/140","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:04.276Z","lastSeenAt":"2026-04-24T17:32:44.287Z"}],"details":{"listingId":"4d2c20b3-62b6-42b5-81c8-0f52c09ff45f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/140 \\\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":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/140"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without account signup or API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol","AI agents needing keyless, pay-per-call API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users needing detailed API documentation or OpenAPI schemas before integrating","High-volume use cases where per-request pricing may add up compared to bulk plans","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.419Z"},"updatedAt":"2026-04-24T17:32:44.287Z"}}