{"id":"2cef9b20-85cf-4004-9328-c70e104880dd","shortId":"WJXEhu","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/payments/214` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe site lists four categories of APIs: 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 utilities (geocoding, validation, conversion, generation). All listed endpoints are priced at $0.02 per request.\n\nDocumentation 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 usage examples available from the crawl. The x402 challenge confirms the endpoint is live and accepts POST requests, but the actual behavior behind the paywall is unknown. Treat this listing as a stub until richer documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — actual request/response format is unknown","All documentation pages (/docs, /api, /pricing, /README) return only a 'Connect wallet' prompt with no content","The endpoint name 'Premium API Access' is generic and does not describe what the endpoint actually does","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/214","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/214","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation beyond the landing page catalog. No OpenAPI spec, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The actual functionality behind 'Premium API Access' is 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'/api/v1/payments/214':69 '/docs':165 '/pricing':167 '/readme':169 '/request':19,38 '0.02':18,37,86,157 '000':80 '20':79 '402 payment api' 'accept':209 'access':74,100 'actual':214 'advertis':91 'ai':12,31,125 'ai-inference' 'analysi':129 'analyt':119 'api':5,24,45,73,93,117 'attach':103 'avail':196 'base':8,27,63,81 'base network api' 'base-network' 'behavior':215 'behind':216 'broad':50 'call':4,23,88 'caller':101 'catalog':51 'categori':115 'challeng':202 'charg':76 'classif':132 'classification' 'confirm':203 'connect':175 'convers':149 'crawl':199 'data':11,30,118,122 'data-analytics' 'detail':182 'document':160,191,229 'embed':133 'embeddings' 'enabl':44 'endpoint':16,35,57,67,153,205 'estim':143 'exampl':195 'exchang':138 'export':123 'extrem':162 'feed':137 'financ':13,32,134 'finance-data' 'four':114 'gas':142 'generat':150 'geocod':147 'geocoding' 'header':107 'i.e':85 'infrastructur':145 'insight':124 'instant':99 'key':94 'label':71 'learn':127 'limit':97 'list':113,152,223 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'x402-payment'","prices":[{"id":"887e4286-ba5f-4a98-b056-7ad5152aa423","listingId":"2cef9b20-85cf-4004-9328-c70e104880dd","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/214","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:51.613Z"}],"sources":[{"listingId":"2cef9b20-85cf-4004-9328-c70e104880dd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/214","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:51.613Z","lastSeenAt":"2026-04-23T05:01:22.625Z"}],"details":{"listingId":"2cef9b20-85cf-4004-9328-c70e104880dd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/214 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/214"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/214"},{"claim":"The site lists four API categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without API key provisioning","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates via micropayment","Geocoding or data validation calls where per-request billing is preferable to a subscription"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-signup, pay-as-you-go API access","Low-volume or bursty workloads where subscriptions are wasteful"],"notFor":["High-volume production workloads that need SLA guarantees and detailed documentation","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.747Z"},"updatedAt":"2026-04-23T05:01:22.625Z"}}