{"id":"211d6e1e-fd52-49ab-9694-1f103f0560b7","shortId":"8kSwws","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access to a broad suite of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/lab/results/99` is listed under the title \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on the Base network. Payment is settled on-chain to the specified wallet address, with a 300-second timeout window.\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 (geocoding, validation, conversion, generation). All endpoints share the same $0.02 per-request pricing. However, the specific functionality behind `/api/v1/lab/results/99` is not documented — the name \"lab results\" and the path parameter \"99\" suggest it may return some form of experimental or test data, but this is unconfirmed.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","post-endpoint","json-response"],"categories":["data","api-gateway"],"synonyms":["x402 API","pay per call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-gated API"],"warnings":["The specific functionality of /api/v1/lab/results/99 is not documented anywhere in the crawled material — 'Premium API Access' is a generic label.","No OpenAPI spec, request schema, or response schema is available.","The /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet').","Cannot verify what data or service this endpoint actually provides."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/99","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/lab/results/99","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 documentation of request/response formats, no examples, and the specific purpose of /api/v1/lab/results/99 is undocumented. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'/request':13,28 '0.02':12,27,67,120,191 '000':115 '20':114 '300':144 '6':125 '99':213 'Base network API' 'USDC micropayment API' 'accept':100 'access':7,22,47,98 'address':141 'advertis':151 'ai':161 'ai/ml':57 'analysi':165 'analyt':56,155 'api':6,21,38,76,97 'base':9,24,72,116,129 'behind':200 'broad':50 'broader':149 'call':4,19,65 'categori':152 'chain':136 'challeng':105 'classif':168 'commit':84 'confirm':106 'convers':184 'cost':66 'crypto-gated API' 'data':55,60,154,158,224 'decim':126 'document':204 'embed':169 'endpoint':53,88,187 'estim':179 'exchang':174 'experiment':221 'export':159 'feed':173 'financ':170 'finance/web3':59 'form':219 'function':199 'gas':178 'gate':46 'generat':185 'geocod':182 'howev':196 'includ':153 'infer':58 'infrastructur':62,181 'insight':160 'json-response' 'key':77 'lab':207 'learn':163 'limit':80 'list':92 'live':109 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':162 'maximum':112 'may':216 'metric':156 'minimum':83 'name':206 'network':73,130 'no-api-key' 'on-chain':134 'paramet':212 'path':211 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':131 'per':3,18,36,193 'per-request':192 'platform':39,150 'post':101 'post-endpoint' 'premium':5,20,96 'price':172,195 'protocol':44 'quot':177 'rate':79,175 'report':157 'request':37,102,110,194 'requir':85 'result':208 'return':217 'second':145 'sentiment':164 'settl':133 'share':188 'sinc':122 'span':54 'specif':87,198 'specifi':139 'suggest':214 'suit':51 'summar':167 'test':223 'text':166 'timeout':146 'titl':95 'token':176 'unconfirm':228 'unit':117 'usd':121 'usdc':15,30,69,119,123 'usdc-base' 'use':41,124 'util':63 'valid':183 'via':10,25 'wallet':140 'web3':171 'window':147 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"edf884fb-91bc-4fdb-a6f4-94ce190faa22","listingId":"211d6e1e-fd52-49ab-9694-1f103f0560b7","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/lab/results/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.756Z"}],"sources":[{"listingId":"211d6e1e-fd52-49ab-9694-1f103f0560b7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.756Z","lastSeenAt":"2026-04-22T01:02:20.664Z"}],"details":{"listingId":"211d6e1e-fd52-49ab-9694-1f103f0560b7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/99 \\\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":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/lab/results/99"},{"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 platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/99"}],"useCases":["Accessing premium data or analytics results without needing an API key or subscription","Agent-driven workflows that need on-demand, pay-per-call API access settled in USDC","Programmatic retrieval of lab or experimental results behind a micropayment wall"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","AI agents with x402-compatible payment capabilities on Base","Users who prefer crypto-native micropayments over traditional billing"],"notFor":["Users who need detailed documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.569Z"},"updatedAt":"2026-04-22T01:02:20.664Z"}}