{"id":"166f8811-b912-48b8-a289-357d7b3fb032","shortId":"uHGcdb","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/4` 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. You send a POST request with an X-PAYMENT header containing a signed USDC payment, and the endpoint returns its result.\n\nThe broader platform advertises four endpoint families: 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 are priced at $0.02 per request and settle on Base.\n\nHowever, the specific functionality of `/api/v1/inbox/4` is unclear. The description is simply \"Premium API Access\" with no further documentation, no OpenAPI schema, and no example request/response. The crawled docs pages (`/api`, `/pricing`, `/README`) all returned only a \"Connect wallet\" prompt with no additional content. Without documentation or schema details, it is impossible to confirm what this particular endpoint actually does or what input it expects beyond a POST with JSON content type.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-api"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific function of /api/v1/inbox/4 is unknown — 'Premium API Access' is the only description","All doc pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","No example request or response available to verify endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/4","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example requests or responses, and the purpose of /api/v1/inbox/4 specifically is undocumented. The crawled pages beyond the landing page returned no useful 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'/api/v1/inbox/4':68,184 '/pricing':210 '/readme':211 '/request':19,38 '0.02':18,37,79,172 '000':83 '20':82 '6':89 'Base network API' 'USDC API' 'access':74,193 'actual':237 'addit':221 'advertis':131 'ai':12,31,142 'analysi':146 'analyt':136 'api':5,24,45,73,99,192 'base':8,27,63,84,178 'base-network' 'beyond':244 'broad':50 'broader':129 'call':4,23,81 'catalog':51 'classif':149 'confirm':232 'connect':216 'contain':117 'content':222,249 'convers':166 'cost':76 'cover':10,29 'crawl':206 'data':11,30,135,139 'decim':90 'descript':188 'detail':227 'doc':207 'document':197,224 'embed':150 'enabl':44 'endpoint':16,35,57,67,124,133,236 'estim':160 'exampl':203 'exchang':155 'expect':243 'export':140 'famili':134 'feed':154 'financ':13,32,151 'four':132 'function':182 'gas':159 'generat':167 'geocod':164 'handl':93 'header':116 'howev':179 'imposs':230 'infrastructur':162 'input':241 'insight':141 'json':248 'json-api' 'key':100 'learn':144 'limit':105 'list':70 'low payment fee' 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'x402-payment'","prices":[{"id":"91c09b71-cf82-42a1-a6d8-304e94bb37ec","listingId":"166f8811-b912-48b8-a289-357d7b3fb032","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.979Z"}],"sources":[{"listingId":"166f8811-b912-48b8-a289-357d7b3fb032","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.979Z","lastSeenAt":"2026-04-22T01:02:16.778Z"}],"details":{"listingId":"166f8811-b912-48b8-a289-357d7b3fb032","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/4 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/4"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/4"},{"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 across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that need on-demand API access settled in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402 protocol experimentation at low cost ($0.02/call)","Crypto-native applications that prefer on-chain settlement"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing may add up compared to subscription models","Anyone without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.021Z"},"updatedAt":"2026-04-22T01:02:16.778Z"}}