{"id":"32aa204f-e18c-4f03-b67e-d8ffff5bc42e","shortId":"6x4x53","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 variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/220` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show \"Connect wallet\"), so the actual request/response schemas for individual endpoints are unknown. Without documentation on what parameters each endpoint accepts or what data it returns, integration requires experimentation.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","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","cheap API access"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) are empty — only showing 'Connect wallet'","No request or response schema available for any endpoint","The 'Premium API Access' endpoint at /api/v1/payments/220 has no description of what it actually returns","Cannot verify that the advertised AI/ML, finance, or utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/220","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/220","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, all documentation pages are empty (just 'Connect wallet'), there is no OpenAPI spec, no request/response schema, and no examples. The 'Premium API Access' label is generic and doesn't describe what the endpoint actually does. This is effectively a stub 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'list':96 'low payment fee' 'lowpaymentfee.com':31 'micropayment API' 'network':9,24,70 'offer':40 'page':183,189 'paramet':208 'pay':2,17,58 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':57 'payment':85,128 'per':3,18,59 'platform':6,21,38,147 'point':177 'post':140 'premium':98 'price':157,176 'quot':162 'rate':76,160 'request':60,89,106,141 'request/response':197 'requir':79,218 'return':102,143,216 'schema':198 'scheme':129 'second':135 'sentiment':151 'sentiment-analysis' 'settl':64 'show':191 'simpli':81 'specif':91 'summar':154 'text':153 'text-summarization' 'timeout':136 'token':161 'unit':112 'unknown':203 'usdc':15,30,66,114,123 'usdc-settlement' 'util':53 'utility-apis' 'valid':166 'varieti':42 'via':10,25 'wallet':193 'without':204 'x402':11,26,35,84 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"c709117a-5971-4299-8ef7-7dd63623eaf5","listingId":"32aa204f-e18c-4f03-b67e-d8ffff5bc42e","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/220","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:50.424Z"}],"sources":[{"listingId":"32aa204f-e18c-4f03-b67e-d8ffff5bc42e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/220","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:50.424Z","lastSeenAt":"2026-04-23T05:01:22.593Z"}],"details":{"listingId":"32aa204f-e18c-4f03-b67e-d8ffff5bc42e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/220 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/220"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto token quotes or gas estimates via pay-per-call","Geocoding or data validation as a utility service with no subscription commitment","Exporting analytics data or generating insights on a per-request billing model"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers wanting to avoid subscription commitments for low-volume API usage","x402-compatible wallets and agents on the Base network"],"notFor":["High-volume production workloads where per-request pricing becomes expensive","Users who need detailed API documentation and guaranteed SLAs before integrating","Non-crypto users without Base network USDC wallets"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.79Z"},"updatedAt":"2026-04-23T05:01:22.593Z"}}