{"id":"10db66f4-d309-49be-9aff-0498cc977f34","shortId":"N6TtZz","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad suite of endpoints across four categories: 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 endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/keys/9` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The platform emphasizes a simple pay-per-use model with instant access.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README routes all return only a \"Connect wallet\" prompt with no additional technical detail. No OpenAPI spec, request/response schemas, or usage examples were found. The exact functionality behind the `/api/v1/keys/9` \"Premium API Access\" endpoint is unclear — it may serve as an API key provisioning or access-grant mechanism, but this is not documented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact functionality of /api/v1/keys/9 ('Premium API Access') is unclear — it may be a key provisioning endpoint or something else entirely","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no technical content","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/9","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/keys/9","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 accepts USDC on Base at $0.02. However, there is no OpenAPI spec, no request/response schema, no usage examples, and the specific purpose of /api/v1/keys/9 ('Premium API Access') is undocumented. The /api, /pricing, and /README pages are all empty beyond a wallet-connect 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'/api/v1/keys/9':108,211 '/pricing':180 '/readme':182 '/request':19,38 '0.02':18,37,95,135 '000':124 '0x8335':129 '20':123 '2913':130 '402 payment api' '6':139 'access':114,170,214,228 'access-gr':227 'across':54 'addit':193 'advertis':119 'ai':12,31,64 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'analysi':68 'analyt':58 'api':5,24,45,113,150,213,223 'base':8,27,103,125,132 'base network api' 'behind':209 'beyond':172 'broad':50 'call':4,23 'categori':56 'challeng':118 'classif':71 'connect':188 'convers':88 'conversion' 'crypto api access' 'crypto-gas-estimates' 'data':11,30,57,61 'data-analytics' 'decim':140 'detail':195 'document':171,235 'embed':72 'emphas':160 'enabl':44 'endpoint':16,35,53,91,107,215 'equal':134 'estim':82 'exact':147,207 'exampl':203 'exchang':77 'exchange-rates' 'export':62 'feed':76 'financ':13,32,73 'finance-price-feeds' 'found':205 'four':55 'function':208 'gas':81 'generat':89 'geocod':86 'geocoding' 'given':136 'grant':229 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'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"a6e32d0e-2e9d-4758-b29b-72d4094f8b1a","listingId":"10db66f4-d309-49be-9aff-0498cc977f34","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/keys/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.157Z"}],"sources":[{"listingId":"10db66f4-d309-49be-9aff-0498cc977f34","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.157Z","lastSeenAt":"2026-04-22T01:02:19.669Z"}],"details":{"listingId":"10db66f4-d309-49be-9aff-0498cc977f34","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/9 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/9"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/9"},{"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":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) on a per-call basis without subscriptions","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, data validation, and format conversion with micropayments","Provisioning or obtaining premium API access keys via a single USDC payment"],"bestFor":["Developers who want pay-per-use API access without managing API keys or subscriptions","Agents and bots that can settle payments programmatically via x402 on Base","Projects needing low-cost, low-friction access to a variety of common API services"],"notFor":["Users who need detailed API documentation, schemas, or guaranteed SLAs before integrating","High-volume production workloads that would benefit from bulk pricing or rate-limited tiers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.643Z"},"updatedAt":"2026-04-22T01:02:19.669Z"}}