{"id":"ec5fd50d-c3ff-44bc-a672-973b6b514db4","shortId":"vHJMaE","kind":"x402","title":"Pay-per-call API platform on Base with USDC payments via x402 — $0.02/request.","tagline":"Pay-per-call API platform on Base with USDC payments via x402 — $0.02/request.","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 priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or upfront commitments required.\n\nThe specific endpoint at `/api/v1/transactions/25` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform also advertises additional endpoint categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 price point. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind \"Premium API Access\" and the other listed endpoints cannot be verified from the crawled material alone.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","validation"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request/response formats for any endpoint","The purpose of '/api/v1/transactions/25' ('Premium API Access') is unclear — no description of what it returns","Cannot verify that any of the advertised endpoints (AI, finance, analytics, etc.) actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/25","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/25","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 402 challenge, confirming it accepts USDC payments on Base at $0.02. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The actual functionality of 'Premium API Access' at /api/v1/transactions/25 is entirely 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'/request':15,30 '0.02':14,29,61,116,165 '000':105 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':133 '0x8335':110 '20':104 '2913':111 '300':136 '6':120 'accept':93 'access':91,212 'actual':207 'addit':143 'address':132 'advertis':99,142 'ai-inference' 'ai/ml':49 'alon':225 'also':141 'analysi':148 'analyt':48 'api':5,20,37,73,90,175,211 'avail':205 'base':8,23,69,106,113 'base network api' 'behind':209 'broad':42 'call':4,19 'cannot':218 'categori':145 'challeng':98 'classif':151 'classification' 'collect':43 'commit':79 'connect':184 'cost':102 'crawl':223 'crypto-quotes' 'data':47,52 'data-analytics' 'decim':121 'detail':191 'doc':174 'document':169,200 'embed':152 'embeddings' 'enabl':36 'endpoint':45,57,83,144,217 'equal':115 'exact':128 'exampl':203 'exchang':155 'extrem':171 'feed':154 'finance-data' 'finance/web3':51 'function':208 'geocod':157 'geocoding' 'given':117 'howev':168 'includ':146 'infer':50 'key':74 'limit':76 'list':87,216 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'made':124 'materi':224 'maximum':101 'micropayment api' 'network':70 'offer':40 'openapi':195 'page':179 'paid':64 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payload':204 'payment':11,26,122 'per':3,18,62 'platform':6,21,38,140 'point':167 'post':94 'premium':89,210 'price':59,153,166,176 'prompt':186 'rate':75,156 'readm':178 'render':181 'request':63,95 'request/response':198 'requir':80 'schema':199 'scheme':129 'second':137 'sentiment':147 'sentiment-analysis' 'servic':55 'settl':130 'span':46 'spars':172 'spec':196 'specif':82 'summar':150 'technic':190 'text':149 'text-summarization' 'timeout':138 'unit':107 'upfront':78 'usdc':10,25,66,109,118 'usdc api' 'usdc-base' 'util':54 'valid':158 'validation' 'verifi':220 'via':12,27,125 'wallet':185 'x402':13,28,35,97,127 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"84a8d7bc-2a30-4aad-9d1c-f9cc63a05c67","listingId":"ec5fd50d-c3ff-44bc-a672-973b6b514db4","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:28.788Z"}],"sources":[{"listingId":"ec5fd50d-c3ff-44bc-a672-973b6b514db4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:28.788Z","lastSeenAt":"2026-04-22T21:31:38.274Z"}],"details":{"listingId":"ec5fd50d-c3ff-44bc-a672-973b6b514db4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/25 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/25"},{"claim":"Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/25"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion utilities with micropayments","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["Agents needing low-friction, keyless API access paid in USDC on Base","Developers wanting pay-as-you-go access to multiple utility and AI endpoints","Web3-native applications that prefer on-chain micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone requiring fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.134Z"},"updatedAt":"2026-04-22T21:31:38.274Z"}}