{"id":"ed8fae1b-999b-4764-a53c-c813dff731e6","shortId":"RMyfk2","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request at $0.02 each using USDC on the Base network, with no API keys, rate limits, or upfront commitments required. Payment is handled via the x402 protocol: callers attach an X-PAYMENT header to each request.\n\nThe specific endpoint at `/api/v1/transactions/300` is listed as \"Premium API Access\" and advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json responses. The x402 challenge was successfully captured, confirming the endpoint is live.\n\nThe broader platform advertises categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas for individual endpoints are not available from the crawl.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["data","llm","finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API","web3 API marketplace"],"warnings":["No OpenAPI or request/response schema available for any endpoint","Documentation, pricing, and README pages are all gated behind wallet connection and returned no useful content","The specific functionality of /api/v1/transactions/300 is undocumented — 'Premium API Access' is vague","The platform lists many endpoint categories but none could be verified for actual functionality from the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/300","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/300","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 pricing is clear ($0.02 USDC on Base per call). However, there is no OpenAPI schema, no documented request/response formats, and all docs/pricing/README pages are gated behind wallet connection, yielding minimal usable documentation. The specific purpose of the /api/v1/transactions/300 endpoint beyond 'Premium API Access' is 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'/request':13,30 '0.02':12,29,68,132 '000':121 '0x8335':126 '20':120 '2913':127 '6':136 'Base network API' 'USDC micropayment API' 'accept':140 'access':113 'advertis':115,161 'ai':171 'ai-inference' 'ai/ml':53 'analysi':175 'analyt':52,165 'api':5,15,22,32,41,78,112 'appear':201 'application/json':145 'attach':94 'avail':216 'base':8,25,74,122,129 'behind':203 'broad':46 'broader':159 'call':4,21 'caller':93 'captur':152 'categori':162 'challeng':149 'classif':178 'classification' 'collect':47 'commit':84 'confirm':153 'connect':206 'convers':195 'cost':118 'crawl':219 'crypto-paid API' 'crypto-quotes' 'data':51,56,164,168 'data-analytics' 'decim':137 'detail':208 'document':197 'embed':179 'embeddings' 'enabl':40 'endpoint':49,61,105,139,155,213 'equal':131 'estim':189 'exchang':184 'exist':199 'export':169 'feed':183 'financ':180 'finance-data' 'finance/web3':55 'gas':188 'gate':202 'generat':196 'geocod':193 'geocoding' 'given':133 'handl':88 'header':99 'includ':163 'individu':212 'infer':54 'infrastructur':191 'insight':170 'key':16,33,79 'learn':173 'limit':81 'list':109 'live':157 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':172 'maximum':117 'metric':166 'network':9,26,75 'offer':44 'page':198 'paid':63 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'payment':86,98 'per':3,20,65 'per-request':64 'per-request-billing' 'platform':6,23,42,160 'post':141 'premium':111 'price':182 'protocol':92 'quot':187 'rate':80,185 'report':167 'request':66,102,142 'request/response':209 'requir':17,34,85 'respons':146 'return':144 'schema':210 'sentiment':174 'sentiment-analysis' 'servic':59 'span':50 'specif':104 'success':151 'summar':177 'text':176 'text-summarization' 'token':186 'unit':123 'upfront':83 'usdc':71,125,134 'usdc-base-network' 'use':70 'util':58,192 'utility-services' 'valid':194 'via':10,27,89 'wallet':205 'web3':181 'web3 API marketplace' 'x':97 'x-payment':96 'x402':11,28,39,91,148 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"bf1f4584-8d88-43fe-8bc3-df0fc262a650","listingId":"ed8fae1b-999b-4764-a53c-c813dff731e6","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/300","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:54.366Z"}],"sources":[{"listingId":"ed8fae1b-999b-4764-a53c-c813dff731e6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/300","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:54.366Z","lastSeenAt":"2026-04-23T02:01:48.373Z"}],"details":{"listingId":"ed8fae1b-999b-4764-a53c-c813dff731e6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/300 \\\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":"All endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment uses USDC on Base network (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/300"},{"claim":"x402 challenge returned HTTP 402 confirming the endpoint is live","source_url":"https://lowpaymentfee.com/api/v1/transactions/300"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting reports with micropayment billing","Geocoding, validation, and data conversion utilities paid per request"],"bestFor":["Agents and bots that need keyless, pay-as-you-go API access","Developers who want to avoid subscription commitments for occasional API calls","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads where subscription pricing would be cheaper","Users without USDC on Base network or unfamiliar with x402 payment protocol","Applications requiring detailed SLAs or guaranteed uptime commitments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.495Z"},"updatedAt":"2026-04-23T02:01:48.373Z"}}