{"id":"11700786-7069-409f-92dd-c8f5a9863460","shortId":"YR5JDk","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 variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request using the x402 protocol, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/payments/274` is labeled \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call.\n\nThe platform advertises a uniform $0.02 per request pricing model with no API keys, no rate limits, no minimums, and instant access. Endpoints span categories including metrics/reports (Data & Analytics), sentiment analysis/summarization/classification/embeddings (AI & ML), price feeds/exchange rates/token quotes/gas estimates (Finance & Web3), and geocoding/validation/conversion/generation (Infrastructure). The x402 challenge was successfully captured, confirming the endpoint is live and accepting POST requests.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The actual functionality behind the \"Premium API Access\" label at this specific path (`/payments/274`) is unclear and may differ from the categorized endpoints listed on the homepage.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","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","crypto api access"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) contain no substantive content — only a 'Connect wallet' prompt.","No OpenAPI or JSON schema available for any endpoint.","The specific functionality of /api/v1/payments/274 ('Premium API Access') is unclear — it does not match any of the categorized endpoints listed on the homepage.","No request or response examples are available anywhere in the crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/274","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/payments/274","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and settlement details, but documentation is effectively nonexistent — all doc/pricing/API pages show only 'Connect wallet'. No OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/payments/274 ('Premium API Access') is not explained beyond its label. The listing is largely a 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'/payments/274':206 '/request':13,28 '0.02':12,27,95,103 '000':89 '20':88 'accept':153 'access':82,119,200 'across':45 'actual':194 'advertis':100 'ai':129 'ai-inference' 'ai/ml':48 'analysis/summarization/classification/embeddings':128 'analyt':47,126 'api':5,20,37,81,110,162,199 'base':8,23,71,90 'base network api' 'base-network' 'behind':196 'call':4,19,97 'captur':146 'categor':214 'categori':122 'challeng':143 'classification' 'confirm':147 'connect':171 'content':177 'crypto api access' 'data':46,125 'data-analytics' 'detail':188 'differ':211 'doc':161 'document':156,189 'embeddings' 'enabl':36 'endpoint':44,55,75,120,149,192,215 'estim':135 'exampl':185 'extrem':158 'feeds/exchange':132 'financ':136 'finance-data' 'finance/web3':50 'function':195 'geocoding' 'geocoding/validation/conversion/generation':139 'homepag':219 'i.e':94 'includ':123 'infer':49 'infrastructur':52,140 'instant':118 'key':111 'label':79,201 'limit':114 'list':216 'live':151 'low payment fee' 'lowpaymentfee.com':31 'maximum':86 'may':210 'metrics/reports':124 'micropayment api' 'minimum':116 'ml':130 'model':107 'network':9,24,72 'no-api-key' 'offer':40 'openapi':181 'page':166 'path':205 'pay':2,17,58 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':57 'payment':66 'per':3,18,59,96,104 'platform':6,21,38,99 'post':154 'premium':80,198 'price':106,131,163 'prompt':173 'protocol':64 'quotes/gas':134 'rate':113 'rates/token':133 'readm':165 'request':60,105,155 'request/response':184 'requir':84 'return':168 'schema':182 'sentiment':127 'sentiment-analysis' 'settl':65 'span':121 'spars':159 'specif':74,204 'substant':176 'success':145 'text-summarization' 'unclear':208 'uniform':102 'unit':91 'usdc':15,30,68,93 'usdc api' 'usdc-settlement' 'use':61 'util':53 'utility-services' 'varieti':42 'via':10,25 'wallet':172 'web3':137 'x402':11,26,35,63,142 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"bf5b5cff-3811-42b7-9978-ee29869a5e6e","listingId":"11700786-7069-409f-92dd-c8f5a9863460","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/payments/274","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:09.985Z"}],"sources":[{"listingId":"11700786-7069-409f-92dd-c8f5a9863460","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/274","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:09.985Z","lastSeenAt":"2026-04-23T03:31:32.475Z"}],"details":{"listingId":"11700786-7069-409f-92dd-c8f5a9863460","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/274 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/274"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/274"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-use analytics and data export into agent workflows"],"bestFor":["Agents needing low-friction, keyless API access with crypto micropayments","Developers who want pay-as-you-go pricing without subscriptions or rate limits","Web3-native applications that can settle in USDC on Base"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Applications requiring high-volume bulk access where per-call pricing is inefficient","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.878Z"},"updatedAt":"2026-04-23T03:31:32.475Z"}}