{"id":"b4228991-e91c-4007-93cc-932979fee574","shortId":"hwV7ws","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 marketplace 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 a payment header to each HTTP request and receive the response immediately upon settlement.\n\nThe specific endpoint at `/api/v1/transactions/144` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the site's uniform pricing. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints in four categories: 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 (geocoding, validation, conversion, generation). Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas are not available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["Documentation pages (/docs, /pricing, /README, /api) all return only a 'Connect wallet' prompt — no usable technical documentation is publicly accessible.","No OpenAPI or JSON schema is available; request and response formats for this endpoint are undocumented.","The specific function of /api/v1/transactions/144 ('Premium API Access') is unclear — it does not match any of the named endpoints listed on the homepage.","The platform lists many endpoint categories but it is unverified whether all are actually functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/144","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/144","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). However, there is no OpenAPI schema, no documented request/response formats, and the docs/pricing/README pages all resolve to a wallet-connect prompt with no usable content. The specific purpose of the /api/v1/transactions/144 endpoint beyond 'Premium API Access' is 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'/request':13,28 '0.02':12,27,59,138 '000':122 '0x8335':127 '20':121 '2913':128 '6':134 'accept':150 'access':112 'advertis':159 'ai':171 'ai-inference' 'ai/ml':49 'analysi':175 'analyt':48,165 'api':5,20,37,71,111 'appear':200 'application/json':155 'attach':87 'avail':214 'base':8,23,67,123,130 'base network api' 'broad':42 'broader':157 'call':4,19,140 'caller':86 'categori':163 'challeng':117 'classif':178 'classification' 'commit':78 'connect':205 'consist':141 'convers':194 'conversion' 'cost':58 'crawl':217 'crypto-quotes' 'data':47,52,164,168 'data-analytics' 'decim':135 'detail':209 'document':196 'embed':179 'embeddings' 'enabl':36 'endpoint':45,57,104,149,160 'equal':137 'estim':189 'everi':56 'exchang':184 'exist':198 'export':169 'feed':183 'financ':180 'finance-data' 'finance/web3':51 'four':162 'gas':188 'gas-estimates' 'generat':195 'geocod':192 'geocoding' 'handl':83 'header':90 'http':93 'immedi':99 'infer':50 'infrastructur':191 'inlin':85 'insight':170 'key':72 'learn':173 'limit':75 'list':108 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':172 'marketplac':38 'metric':166 'micropayment api' 'network':9,24,68 'offer':40 'page':197 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':84,89 'per':3,18,60,139 'platform':6,21,158 'post':151 'premium':110 'price':147,182 'protocol':82 'quot':187 'rate':74,185 'receiv':96 'report':167 'request':61,94,118,152 'request/response':210 'requir':79,202 'respons':98 'return':114,154 'schema':211 'sentiment':174 'sentiment-analysis' 'servic':55 'set':43 'settlement':101 'sinc':131 'site':144 'span':46 'specif':103 'summar':177 'text':176 'text-summarization' 'token':186 'uniform':146 'unit':124 'upon':100 'usdc':15,30,64,126,132 'usdc api' 'usdc-base-network' 'use':133 'util':54 'valid':193 'validation' 'via':10,25 'view':207 'wallet':204 'web3':181 'x402':11,26,35,81,116 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2b812023-892b-4e58-a896-881d80399765","listingId":"b4228991-e91c-4007-93cc-932979fee574","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/144","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:35.748Z"}],"sources":[{"listingId":"b4228991-e91c-4007-93cc-932979fee574","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/144","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:35.748Z","lastSeenAt":"2026-04-22T17:02:12.379Z"}],"details":{"listingId":"b4228991-e91c-4007-93cc-932979fee574","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/144 \\\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":"Uniform pricing of $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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/144"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call basis without API keys","Fetching real-time crypto prices, exchange rates, and gas estimates via micropayments","Running geocoding, validation, or data conversion utilities with no subscription commitment","Exporting analytics data or generating insights reports paid per request"],"bestFor":["Agents or developers who want instant API access without signup or API key management","Low-volume or bursty workloads where per-call pricing is more economical than subscriptions","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request fees add up (no bulk discounts documented)","Users without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.656Z"},"updatedAt":"2026-04-22T17:02:12.379Z"}}