{"id":"3c49e5bc-bc31-41c8-9e86-0bdb1bb45d42","shortId":"ftTdn2","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/inbox/100` 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, no subscriptions, no rate limits. Callers attach an `X-PAYMENT` header with a valid payment proof and receive the response immediately.\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 listed endpoints share the same $0.02/request pricing.\n\nHowever, the specific functionality of the `/api/v1/inbox/100` endpoint is not documented beyond its title \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, API) returned only a \"Connect wallet\" prompt with no additional content. The endpoint is live and returns a well-formed x402 challenge, but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No documentation exists for the /api/v1/inbox/100 endpoint beyond its title 'Premium API Access'","No OpenAPI schema or request/response examples available","Crawled docs, pricing, and README pages returned no useful content (only 'Connect wallet')","The actual functionality and response format of this endpoint are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/100","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/inbox/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what /api/v1/inbox/100 actually does or returns. No OpenAPI schema, no request/response examples, and the crawled pages beyond the homepage were empty. The listing is effectively a stub with confirmed 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'openapi':193 'page':202 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':92,112,117,235 'per':3,22,55,81 'platform':6,25,46,126 'premium':73,187 'premium api access' 'price':149,172,203 'prompt':211 'proof':118 'protocol':98 'provid':48 'quot':154 'rate':105,152 'readm':204 'receiv':120 'report':134 'request':56 'request/response':196 'respons':122 'return':206,221,232 'schema':194 'sentiment':141 'settl':58 'share':167 'specif':66,175 'subscript':103 'success':234 'summar':144 'text':143 'titl':186 'token':153 'unit':86 'unknown':237 'upon':233 'usdc':9,28,60,88 'usdc api' 'usdc-settlement' 'util':15,34,159 'valid':116,161 'via':95 'wallet':210 'web3':148 'well':224 'well-form':223 'wider':125 'x':111 'x-payment':110 'x402':43,97,226 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"7b56190f-c28b-4134-a6fb-54c53bba7704","listingId":"3c49e5bc-bc31-41c8-9e86-0bdb1bb45d42","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/inbox/100","description":"Premium API 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endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/100"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/100"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request costs in USDC on Base","Accessing data, AI inference, finance, or utility endpoints with micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto-native (USDC on Base) billing over traditional subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring guaranteed SLAs or enterprise support","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:10.086Z"},"updatedAt":"2026-04-22T16:32:47.776Z"}}