{"id":"23bcf964-de7d-49d2-b74b-1621c8639ab2","shortId":"wNecuL","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 catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/25` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing. The x402 challenge confirms the endpoint is live, accepts POST requests, and settles via the USDC contract on Base (0x8335…2913).\n\nNote that the specific functionality behind `/api/v1/keys/25` (\"Premium API Access\") is not clearly documented — it may serve as a key-provisioning or meta-access endpoint rather than one of the domain-specific APIs listed on the homepage. No OpenAPI schema, request/response examples, or detailed documentation were found during crawling; the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","micropayment API","x402 API","USDC API","Base network API","low fee API","per-request billing","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific function of /api/v1/keys/25 ('Premium API Access') is unclear — it may be a meta/key-provisioning endpoint rather than a domain API","All non-homepage pages (/api, /pricing, /README) returned only 'Connect wallet' with no documentation","No request or response examples are available; integration requires trial-and-error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/25","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/25","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 pricing is clear ($0.02/request in USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a homepage listing. The specific purpose of /api/v1/keys/25 is ambiguous. Most crawled pages returned only 'Connect wallet' with no useful 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'/api/v1/keys/25':69,187 '/pricing':235 '/readme':237 '/request':19,38,158 '0.02':18,37,80,157 '000':84 '0x8335':179 '20':83 '2913':180 '6':90 'Base network API' 'USDC API' 'accept':168 'access':75,190,206 'addit':248 'advertis':114 'ai':12,31,125 'ai-inference' 'analysi':129 'analyt':119 'api':5,24,45,74,93,189,216 'attach':104 'base':8,27,63,85,178 'base-network' 'behind':186 'broad':50 'call':4,23,82 'caller':102 'catalog':51 'categori':117 'challeng':162 'classif':132 'classification' 'clear':193 'commit':99 'confirm':163 'connect':243 'content':249 'contract':176 'convers':149 'cost':77 'crawl':232 'crypto-paid API' 'data':11,30,118,122 'data-analytics' 'decim':91 'detail':227 'document':194,228 'domain':214 'domain-specif':213 'embed':133 'embeddings' 'enabl':44 'endpoint':16,35,57,67,116,153,165,207 'estim':143 'exampl':225 'exchang':138 'export':123 'feed':137 'financ':13,32,134 'finance-data' 'found':230 'four':115 'function':185 'gas':142 'generat':150 'geocod':147 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'wallet':244 'web3':135 'x402':43,106,161 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"182024ca-de35-497f-bcd6-1312bf43a463","listingId":"23bcf964-de7d-49d2-b74b-1621c8639ab2","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.440Z"}],"sources":[{"listingId":"23bcf964-de7d-49d2-b74b-1621c8639ab2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.440Z","lastSeenAt":"2026-04-22T01:02:18.755Z"}],"details":{"listingId":"23bcf964-de7d-49d2-b74b-1621c8639ab2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/25 \\\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/25"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/25"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, no commitments advertised","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without subscription overhead","Fetching real-time financial data or crypto gas estimates with per-call billing","Geocoding or data validation as a utility service paid in USDC","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["AI agents that need low-friction, keyless API access settled on-chain","Developers wanting per-request pricing with no minimums or commitments","Web3-native applications that already hold USDC on Base"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Teams requiring SLA guarantees or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.769Z"},"updatedAt":"2026-04-22T01:02:18.755Z"}}