{"id":"02606354-e833-4037-be02-a3d15e246106","shortId":"kw9cZw","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/71` 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 per call. However, documentation beyond the landing page is extremely sparse; the docs, API, pricing, and README pages all appear to require a wallet connection and contain no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"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 specification or request/response schema available","Documentation pages (docs, pricing, README, api) are empty or require wallet connection — no substantive docs found","The specific functionality of /api/v1/payments/71 ('Premium API Access') is not documented; it is unclear what data or service it returns","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/71","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/71","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, documentation is essentially nonexistent — all doc/pricing/README pages require wallet connection and show no content. There is no OpenAPI spec, no request/response schemas, and no examples. The specific purpose of the '/payments/71' endpoint beyond 'Premium API Access' is 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'lowpaymentfee.com':31 'materi':223 'micropayment api' 'network':9,24,70 'no-api-key' 'offer':40 'openapi':209 'page':183,193 'pay':2,17,58 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':57 'payment':85,128 'per':3,18,59,176 'platform':6,21,38,147 'post':140 'premium':98 'price':157,190 'quot':162 'rate':76,160 'readm':192 'request':60,89,106,141 'request/response':212 'requir':79,197 'return':102,143 'schema':213 'scheme':129 'second':135 'sentiment':151 'sentiment-analysis' 'settl':64 'simpli':81 'spars':186 'spec':210 'specif':91 'substant':204 'summar':154 'text':153 'text-summarization' 'timeout':136 'token':161 'unit':112 'usag':217 'usdc':15,30,66,114,123 'usdc api' 'usdc-settlement' 'util':53 'valid':166 'varieti':42 'via':10,25 'wallet':199 'x402':11,26,35,84 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"62439814-a21f-4bb2-ad00-45665e2d6bc0","listingId":"02606354-e833-4037-be02-a3d15e246106","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:48.316Z"}],"sources":[{"listingId":"02606354-e833-4037-be02-a3d15e246106","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:48.316Z","lastSeenAt":"2026-04-23T02:01:19.981Z"}],"details":{"listingId":"02606354-e833-4037-be02-a3d15e246106","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/71 \\\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":"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/71"},{"claim":"Platform offers endpoints for analytics, AI/ML (sentiment, summarization, classification, embeddings), finance (prices, rates, quotes, gas), and utilities (geocode, validate, convert, generate)","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven API calls where per-request micropayments replace API key management","Accessing AI inference (sentiment, summarization, classification, embeddings) without subscriptions","Fetching real-time crypto/finance data (token quotes, gas estimates, exchange rates) on demand","Geocoding and data validation utilities paid per use"],"bestFor":["AI agents that need frictionless, keyless API access via x402","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads where per-request pricing becomes expensive compared to bulk plans","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.05Z"},"updatedAt":"2026-04-23T02:01:19.981Z"}}