{"id":"b35063a2-a488-4203-91bd-969e95f5da31","shortId":"B32FVs","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 broad catalog 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 subscriptions required. The specific endpoint at `/api/v1/transactions/211` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base.\n\nThe 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 use the same $0.02 pricing model. Payment is settled on-chain via the x402 protocol using the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.\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 usage examples available from the crawl. The endpoint is confirmed live (returns a valid 402 challenge), but the actual functionality behind the \"Premium API Access\" label at `/api/v1/transactions/211` is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","no-api-key"],"categories":["data","llm","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/transactions/211 ('Premium API Access') is not described anywhere","No request or response examples available; input/output formats are unknown","The broad catalog of endpoints (AI, finance, analytics, utils) is advertised but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/211","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/211","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 pricing and payment details. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of /api/v1/transactions/211 ('Premium API Access') is unclear. Score reflects a live but poorly documented 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'/api/v1/transactions/211':84,237 '/docs':182 '/pricing':184 '/readme':186 '/request':13,28 '0.02':12,27,59,105,156 '000':100 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':174 '20':99 '402':224 '6':110 'access':90,234 'actual':228 'advertis':116 'ai':126 'ai-inference' 'ai/ml':49 'analysi':130 'analyt':48,120 'api':5,20,37,71,89,233 'avail':212,241 'base':8,23,67,101,113,176 'base network api' 'behind':230 'broad':42 'call':4,19 'catalog':43 'categori':117 'chain':164 'challeng':95,225 'classif':133 'classification' 'confirm':219 'connect':192 'content':198 'contract':172 'convers':149 'cost':58 'crawl':215 'crypto api access' 'crypto-quotes' 'data':47,52,119,123 'data-analytics' 'decim':111 'document':177,207 'embed':134 'embeddings' 'enabl':36 'endpoint':45,57,82,152,217 'estim':144 'everi':56 'exampl':211 'exchang':139 'export':124 'extrem':179 'feed':138 'financ':135 'finance-data' 'finance/web3':51 'function':229 'gas':143 'generat':150 'geocod':147 'geocoding' 'includ':118 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'x402':11,26,35,94,167 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"1de997b5-3123-47fd-a0c2-c5d2759d5bc5","listingId":"b35063a2-a488-4203-91bd-969e95f5da31","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/211","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:14.457Z"}],"sources":[{"listingId":"b35063a2-a488-4203-91bd-969e95f5da31","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/211","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:14.457Z","lastSeenAt":"2026-04-23T05:01:44.159Z"}],"details":{"listingId":"b35063a2-a488-4203-91bd-969e95f5da31","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/211 \\\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":"Endpoint returns x402 challenge with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/211"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/211"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance and crypto market data on a per-request basis","Running utility operations like geocoding, validation, and data conversion with micropayments","Programmatic agents purchasing API calls autonomously via x402 on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that need autonomous endpoint purchasing via x402","Projects needing low-cost per-request pricing without subscriptions"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime","Users who need detailed API documentation or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.799Z"},"updatedAt":"2026-04-23T05:01:44.159Z"}}