{"id":"d0f25ce5-4ebf-44b9-9b1f-6d1cdc35aae6","shortId":"Mc6bsJ","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/30` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; each request is paid for individually with an on-chain USDC transaction.\n\nThe wider 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 endpoints are listed at the same $0.02/request price point.\n\nHowever, the specific functionality behind the `/api/v1/keys/30` endpoint is not documented beyond its \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, API) all resolve to a minimal \"Connect wallet\" prompt with no additional detail. The endpoint is confirmed live — it returns a valid x402 402 challenge — but what it actually returns upon successful payment is unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No documentation available for what /api/v1/keys/30 actually returns upon successful payment","No OpenAPI or schema definition found for any endpoint on the platform","Crawled docs/pricing/README pages all resolve to a minimal 'Connect wallet' page with no content","The purpose of 'Premium API Access' is ambiguous — it may be an API key generator or a meta-endpoint rather than a data endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/30","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/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation explaining what the /api/v1/keys/30 endpoint actually returns. The crawled pages beyond the homepage are empty stubs. The listing is essentially a stub with pricing info 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'metric':129 'micropayment API' 'minim':208 'network':64 'no-api-key' 'offer':10,29 'on-chain':115 'openapi':191 'page':200 'paid':110 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':92,235 'per':3,22,55,81 'platform':6,25,46,122 'point':170 'premium':73,184 'premium API access' 'price':145,169,201 'prompt':211 'protocol':98 'provid':48 'quot':150 'rate':148 'readm':202 'report':130 'request':56,108 'request/response':194 'requir':106 'resolv':205 'return':222,232 'schema':192 'sentiment':137 'settl':58 'specif':66,173 'subscript':104 'success':234 'summar':140 'text':139 'token':149 'transact':119 'unit':86 'unknown':237 'upon':233 'usdc':9,28,60,88,118 'usdc-settlement' 'util':15,34,155 'utility-services' 'valid':157,224 'via':95 'wallet':210 'web3':144 'wider':121 'x402':43,97,225 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d128713f-f4c4-4475-ab6a-6c690476dac8","listingId":"d0f25ce5-4ebf-44b9-9b1f-6d1cdc35aae6","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/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.301Z"}],"sources":[{"listingId":"d0f25ce5-4ebf-44b9-9b1f-6d1cdc35aae6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.301Z","lastSeenAt":"2026-04-22T01:02:18.563Z"}],"details":{"listingId":"d0f25ce5-4ebf-44b9-9b1f-6d1cdc35aae6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/30 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/30"},{"claim":"All listed endpoints are 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":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/30"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Paying for individual AI inference calls (sentiment, summarization, classification, embeddings) with USDC","Fetching financial data like token quotes, gas estimates, or exchange rates per request","Running utility operations like geocoding or data validation with per-call billing"],"bestFor":["AI agents with USDC on Base that need frictionless, keyless API access","Developers prototyping integrations who want zero-commitment pay-per-use pricing","Web3-native applications that prefer on-chain settlement over traditional billing"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation and guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.02Z"},"updatedAt":"2026-04-22T01:02:18.563Z"}}