{"id":"f9a19b3a-e27b-46f7-bad4-1be66a29df27","shortId":"9FSTDt","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 broad set of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach an X-PAYMENT header with a signed USDC payment, and the server fulfills the request upon verification.\n\nThe specific endpoint at `/api/v1/transactions/385` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises additional 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 price point. However, documentation beyond the landing page is extremely sparse (docs, pricing, and API pages all render only a \"Connect wallet\" prompt), so the actual response schemas, input parameters, and data sources for these endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","finance","llm","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["No API documentation available — docs, pricing, and API pages all show only 'Connect wallet'","The specific purpose and expected input/output of /api/v1/transactions/385 is undocumented","No OpenAPI spec or response schema provided","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/385","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/transactions/385","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 ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, no examples, and the docs/pricing/API pages are all blank beyond a wallet-connect prompt. The purpose of this specific /transactions/385 path is unclear beyond the generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,59,143,190 '000':132 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':155 '0x8335':137 '20':131 '2913':138 '300':158 '402 payment required' '6':147 'accept':118 'access':116 'across':46 'actual':216 'addit':164 'address':154 'advertis':163 'ai/ml':49 'analysi':168 'analyt':48 'api':5,20,37,71,115,205 'attach':87 'base':8,23,67,133,140 'base network api' 'beyond':195 'broad':42 'call':4,19 'caller':86 'challeng':123 'classif':171 'commit':78 'confirm':124 'connect':211 'convers':183 'cost':58 'data':47,52,222 'decim':148 'direct':152 'doc':202 'document':194 'embed':172 'enabl':36 'endpoint':45,57,108,165,226 'equal':142 'estim':180 'everi':56 'exchang':175 'extrem':200 'feed':174 'finance/web3':51 'fulfil':101 'gas':179 'generat':185 'geocod':181 'given':144 'handl':83 'header':92 'howev':193 'infer':50 'inlin':85 'input':219 'json-response' 'key':72 'land':197 'limit':75 'list':112 'live':127 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,68 'no-api-key' 'offer':40 'page':198,206 'paid':62 'paramet':220 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':84,91,97,150 'per':3,18,60 'platform':6,21,38,162 'point':192 'post':119 'post-endpoint' 'premium':114 'price':173,191,203 'prompt':213 'protocol':82 'quot':178 'rate':74,176 'render':208 'request':61,103,120,128 'requir':79 'respons':217 'schema':218 'second':159 'sentiment':167 'server':100 'servic':55 'set':43 'sign':95 'sourc':223 'spars':201 'specif':107 'summar':170 'text':169 'timeout':160 'token':177 'unit':134 'unknown':228 'upon':104 'usdc':15,30,64,96,136,145 'usdc api' 'usdc-base-network' 'util':54 'valid':182 'verif':105 'via':10,25 'wallet':212 'x':90 'x-payment':89 'x402':11,26,35,81,122 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"09fbf087-7045-434d-859d-5129c6e76c89","listingId":"f9a19b3a-e27b-46f7-bad4-1be66a29df27","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/transactions/385","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:35.584Z"}],"sources":[{"listingId":"f9a19b3a-e27b-46f7-bad4-1be66a29df27","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/385","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:35.584Z","lastSeenAt":"2026-04-22T18:32:35.884Z"}],"details":{"listingId":"f9a19b3a-e27b-46f7-bad4-1be66a29df27","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/385 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/385"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to analytics, AI inference, or financial data without subscriptions"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.475Z"},"updatedAt":"2026-04-22T18:32:35.884Z"}}