{"id":"a250aa2f-deb0-4587-9cde-b0e414acde4f","shortId":"buqpqc","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 paid per-request using USDC on the Base network, with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/transfers/199` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals).\n\nThe platform advertises a broad catalog of endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. Payment is handled via the x402 protocol's \"exact\" scheme, settling on-chain to a specified payTo address. The x402 challenge specifies a 300-second timeout and accepts POST requests.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the endpoints actually return. The endpoint probed (`/api/v1/transfers/199`) has a generic \"Premium API Access\" description that does not clarify what data or functionality it provides.","tags":[],"capabilities":["x402-payment","usdc-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) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/transfers/199 has a vague 'Premium API Access' label — its actual functionality is unknown","No request body schema or response schema documented anywhere","Cannot verify that the advertised AI/ML, finance, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/199","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/transfers/199","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 is operational. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and the specific endpoint's purpose ('Premium API Access' at /api/v1/transfers/199) is unclear. The broad catalog is listed on the homepage but without any detail on inputs or 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'/request':13,28 '0.02':12,27,108,144 '000':97 '0x8335':102 '20':96 '2913':103 '300':171 '402':91 '6':113 'accept':175 'access':87,227 'across':45 'actual':216 'address':165 'advertis':117 'ai-inference' 'ai/ml':48 'analysi':125 'analyt':47 'api':5,20,37,69,86,184,226 'base':8,23,65,98,105 'base network api' 'broad':119 'call':4,19,110 'catalog':120 'chain':160 'challeng':92,168 'clarifi':232 'classif':128 'classification' 'commit':76 'connect':193 'content':199 'convers':136 'crypto api access' 'data':46,138,234 'data-analytics' 'decim':114 'descript':228 'doc':183 'document':178,208 'embed':129 'embeddings' 'enabl':36 'endpoint':44,55,80,122,215,219 'equal':107 'exact':155 'exampl':211 'exchang':132 'export':139 'extrem':180 'feed':131 'finance-data' 'finance/web3':50 'function':236 'generic':224 'geocod':134 'geocoding' 'handl':149 'includ':123 'infer':49 'infrastructur':52 'key':70 'label':84 'limit':73 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,66 'no-api-key' 'offer':40 'on-chain':158 'openapi':203 'page':188 'paid':57 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':147 'payto':164 'per':3,18,59,109 'per-request':58 'platform':6,21,38,116 'point':146 'post':176 'premium':85,225 'price':130,145,185 'probe':220 'prompt':195 'protocol':153 'provid':238 'rate':72,133 'readm':187 'render':190 'request':60,93,177 'request/response':206 'requir':77 'return':89,217 'schema':207 'scheme':156 'second':172 'sentiment':124 'sentiment-analysis' 'settl':157 'spars':181 'spec':204 'specif':79 'specifi':163,169 'summar':127 'text':126 'text-summarization' 'timeout':173 'unit':99 'usdc':15,30,62,101,111 'usdc api' 'usdc-base-network' 'use':61,112 'util':53 'utility-services' 'valid':135 'varieti':42 'via':10,25,150 'wallet':194 'x402':11,26,35,152,167 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"4c360b63-b3d5-4013-86c5-37db6764f6be","listingId":"a250aa2f-deb0-4587-9cde-b0e414acde4f","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/transfers/199","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:45.220Z"}],"sources":[{"listingId":"a250aa2f-deb0-4587-9cde-b0e414acde4f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/199","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:45.220Z","lastSeenAt":"2026-04-22T15:02:25.082Z"}],"details":{"listingId":"a250aa2f-deb0-4587-9cde-b0e414acde4f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/199 \\\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 priced at $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 with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transfers/199"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments"],"bestFor":["Developers who want keyless, pay-per-use API access settled in USDC on Base","Agents and bots that need programmatic access to diverse API endpoints via x402","Projects needing low-cost micropayment-gated API calls without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.172Z"},"updatedAt":"2026-04-22T15:02:25.082Z"}}