{"id":"ad09c358-f95e-4ddc-852c-6e3de06d45a5","shortId":"49mJaV","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/65` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises four categories of endpoints: 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. However, the specific functionality behind the `/api/v1/inbox/65` path is not documented beyond the generic \"Premium API Access\" label, so its exact purpose is unclear.\n\nThe endpoint is live and returns a well-formed x402 challenge (version 1, scheme \"exact\") with payment directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the canonical Base USDC contract (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The timeout is 300 seconds. No OpenAPI schema, detailed documentation, or example responses were found during the crawl — the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","lowpaymentfee"],"warnings":["The exact purpose and input/output schema of /api/v1/inbox/65 ('Premium API Access') is unknown — no documentation found.","All non-root crawled pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no documentation content.","No OpenAPI spec, ai-plugin manifest, or robots.txt/agents.txt discovered.","The broad list of endpoints (AI, finance, data, etc.) is advertised on the landing page but none could be individually verified or documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/65","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/65","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 challenge, but the specific functionality of /api/v1/inbox/65 is undocumented. No OpenAPI schema, no example responses, and the crawled docs pages (pricing, README, api) returned only 'Connect wallet' with no useful content. The platform lists many endpoints but provides no detailed documentation for any of 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'/api/v1/inbox/65':65,165 '/pricing':232 '/readme':234 '/request':17,34,157 '0.02':16,33,83,156 '000':77 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':204 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':211 '1':196 '20':76 '300':215 '6':89 'access':71,175 'address':203 'advertis':112 'ai':10,27,124 'ai-inference' 'analysi':128 'analyt':118 'api':4,21,41,70,92,174 'attach':101 'base':7,24,59,78,208 'base usdc api' 'behind':49,163 'beyond':170 'broader':110 'caller':99 'canon':207 'categori':114 'challeng':194 'charg':73 'classif':131 'classification' 'connect':240 'content':246 'contract':210 'convers':148 'crawl':229 'data':9,26,117,121 'data-analytics' 'decim':90 'detail':220 'direct':201 'document':169,221 'embed':132 'embeddings' 'endpoint':14,31,48,63,116,152,184 'estim':142 'exact':179,198 'exampl':223 'exchang':137 'export':122 'feed':136 'financ':11,28,133 'finance-data' 'form':192 'found':226 'four':113 'function':162 'gas':141 'gate':3,20,44 'generat':149 'generic':172 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'wallet':241 'web3':134 'well':191 'well-form':190 'x402':2,19,39,103,193 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"ede1022f-18df-4201-8782-21f8bc030a4b","listingId":"ad09c358-f95e-4ddc-852c-6e3de06d45a5","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:22.085Z"}],"sources":[{"listingId":"ad09c358-f95e-4ddc-852c-6e3de06d45a5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.085Z","lastSeenAt":"2026-04-22T05:32:10.524Z"}],"details":{"listingId":"ad09c358-f95e-4ddc-852c-6e3de06d45a5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/65 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/65","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/65"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/65"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates","Running data analytics queries and exporting data on a pay-per-call basis","Using utility services like geocoding, validation, and format conversion"],"bestFor":["Agents and developers who want zero-signup, pay-per-call API access","Crypto-native applications that can settle micropayments in USDC on Base","Low-volume or bursty workloads where per-request pricing beats subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, documentation, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:07.917Z"},"updatedAt":"2026-04-22T05:32:10.524Z"}}