{"id":"f31745bf-c0f5-40e0-bb3d-98d52187ee7f","shortId":"aZCXjY","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 spanning 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/367` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform also 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 price point. Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas for individual endpoints are not publicly available. Without further documentation, the exact input parameters and response format for this specific transactions endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-api-key endpoint"],"warnings":["No public documentation available — all doc pages require wallet connection","The specific purpose and expected input/output of /api/v1/transactions/367 is undocumented","No OpenAPI or schema definition found for any endpoint","The platform lists many endpoint categories but it is unclear whether they are all functional or placeholders"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/367","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/367","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format for this specific endpoint, and all doc pages beyond the landing page are gated behind wallet connection. The purpose of '/api/v1/transactions/367' is unclear beyond the generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,59,139,186 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x8335':133 '20000':128 '2913':134 '300':154 '6':143 'accept':118 'access':116 'address':150 'advertis':124,160 'ai-inference' 'ai/ml':49 'also':159 'analysi':164 'analyt':48 'api':5,20,37,71,115 'appear':193 'attach':87 'avail':209 'base':8,23,67,129,136 'base network api' 'behind':195 'broad':42 'call':4,19 'caller':86 'challeng':123 'classif':167 'classification' 'commit':78 'connect':198 'convers':179 'cost':58 'crypto-quotes' 'data':47,52 'data-analytics' 'decim':144 'detail':200 'document':189,212 'embed':168 'embeddings' 'enabl':36 'endpoint':45,57,108,161,205,224 'equal':138 'estim':176 'everi':56 'exact':214 'exchang':171 'exist':191 'feed':170 'finance-data' 'finance/web3':51 'format':219 'fulfil':101 'gas':175 'gate':194 'generat':181 'geocod':177 'geocoding' 'given':140 'handl':83 'header':92 'individu':204 'infer':50 'inlin':85 'input':215 'key':72 'limit':75 'list':112 'low payment fee' 'lowpaymentfee.com':31 'maxamountrequir':126 'micropayment api' 'network':9,24,68 'no-api-key endpoint' 'offer':40 'page':190 'paid':62 'paramet':216 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':84,91,97,146 'per':3,18,60 'platform':6,21,38,158 'point':188 'post':119 'premium':114 'price':169,187 'protocol':82 'public':208 'quot':174 'rate':74,172 'request':61,103,120 'request/response':201 'requir':79 'respons':218 'schema':202 'second':155 'sent':148 'sentiment':163 'sentiment-analysis' 'server':100 'servic':55 'set':43 'sign':95 'span':46 'specif':107,222 'summar':166 'text':165 'text-summarization' 'timeout':156 'token':173 'transact':223 'unit':130 'unknown':226 'upon':104 'usdc':15,30,64,96,132,141 'usdc api' 'usdc-base' 'util':54 'utility-services' 'valid':178 'verif':105 'via':10,25 'wallet':197 'without':210 'x':90 'x-payment':89 'x402':11,26,35,81,122 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"b2788745-25e7-4721-a858-e4aba0d74ca1","listingId":"f31745bf-c0f5-40e0-bb3d-98d52187ee7f","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/367","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:31.941Z"}],"sources":[{"listingId":"f31745bf-c0f5-40e0-bb3d-98d52187ee7f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/367","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:31.941Z","lastSeenAt":"2026-04-22T18:32:35.653Z"}],"details":{"listingId":"f31745bf-c0f5-40e0-bb3d-98d52187ee7f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/367 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/367"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time crypto quotes, gas estimates, or exchange rates on a per-call basis","Running geocoding or data validation utilities with instant USDC micropayments","Exporting data or generating analytics reports pay-as-you-go"],"bestFor":["Developers who want instant API access without registration or API keys","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.671Z"},"updatedAt":"2026-04-22T18:32:35.653Z"}}