{"id":"91cdfcb7-8906-4baa-8a64-102be4906a24","shortId":"VZrZj7","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/inbox/105` 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 signed payment to access the resource.\n\nThe broader 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 uniformly priced at $0.02 per request.\n\nHowever, the specific functionality behind `/api/v1/inbox/105` is not documented — the path pattern (\"inbox/105\") does not match any of the publicly listed API routes. No OpenAPI schema, request/response examples, or detailed documentation were found for this endpoint or for the platform generally. The crawled /api, /pricing, and /README pages returned only a \"Connect wallet\" prompt with no substantive content. The endpoint is confirmed live (returns a valid 402 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","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["The path /api/v1/inbox/105 does not correspond to any documented endpoint on the platform's landing page.","No OpenAPI spec, request schema, or response schema is available for this or any endpoint on the platform.","The /api, /pricing, and /README pages returned no useful content beyond a wallet-connect prompt.","Actual response payload upon successful payment is unknown — callers are paying blind."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/105","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/105","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific path '/api/v1/inbox/105' does not match any publicly listed route. The actual functionality behind this endpoint is entirely 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'/api/v1/inbox/105':68,175 '/pricing':214 '/readme':216 '/request':19,38 '0.02':18,37,79,167 '000':83 '20':82 '402':236 '6':89 'Base network API' 'USDC API' 'access':74,118 'actual':241 'advertis':124 'ai':12,31,135 'analysi':139 'analyt':129 'api':5,24,45,73,99,191 'attach':107 'base':8,27,63,84 'base-network' 'behind':174 'broad':50 'broader':122 'call':4,23,81 'caller':106 'catalog':51 'categori':127 'challeng':237 'classif':142 'confirm':231 'connect':221 'content':227 'convers':159 'cost':76 'cover':10,29 'crawl':212 'data':11,30,128,132 'decim':90 'detail':199 'document':178,200 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,162,205,229 'estim':153 'exampl':197 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'found':202 'four':125 'function':173 'gas':152 'general':210 'generat':160 'geocod':157 'handl':93 'header':112 'howev':170 'http-post' 'inbox/105':182 'infrastructur':155 'insight':134 'key':100 'learn':137 'limit':105 'list':70,190 'live':232 'lowpaymentfee' 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'x402-payment'","prices":[{"id":"7d71aa06-2218-4c08-b8d4-786eff32ac7c","listingId":"91cdfcb7-8906-4baa-8a64-102be4906a24","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/105","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.001Z"}],"sources":[{"listingId":"91cdfcb7-8906-4baa-8a64-102be4906a24","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/105","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.001Z","lastSeenAt":"2026-04-22T01:02:14.241Z"}],"details":{"listingId":"91cdfcb7-8906-4baa-8a64-102be4906a24","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/105 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-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/inbox/105"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/105"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to an inbox or messaging resource behind a paywall"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing well-documented APIs with clear request/response schemas","Anyone without a Base-network USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.822Z"},"updatedAt":"2026-04-22T01:02:14.241Z"}}