{"id":"f77a9ba7-8db9-4c85-82da-7f9adf7cff8a","shortId":"mpqzBc","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/180` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers pay per request via the x402 protocol's X-PAYMENT header.\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. However, the specific `/api/v1/inbox/180` path does not clearly map to any of these named endpoints, so its exact functionality is unknown.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with scheme \"exact\", accepting POST requests. Payment is directed to wallet `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The maximum timeout is 300 seconds. No OpenAPI schema, detailed documentation, or example request/response bodies were found in the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-platform","data","llm","finance","infrastructure"],"synonyms":["x402 api","pay per call api","micropayment api","usdc api","base network api","lowpaymentfee","premium api access","crypto paid api"],"warnings":["The path /api/v1/inbox/180 does not correspond to any of the named endpoints listed on the homepage; its actual functionality is unclear.","No API documentation, OpenAPI schema, or example request/response bodies are available.","The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet').","Without knowing what this endpoint returns, callers cannot verify it provides useful data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/180","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/180","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 path /api/v1/inbox/180 has no documentation explaining what it does. No OpenAPI schema, no request/response examples, and the crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. The endpoint's purpose is essentially 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'/request':19,38,160 '0.02':18,37,80,159 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':206 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':209 '20':83 '300':216 '402':194 '6':90 'accept':198 'access':75 'advertis':99,116 'ai':12,31,127 'analysi':131 'analyt':121 'api':5,24,45,74,93 'base':8,27,63,85,211 'base network api' 'bodi':226 'broad':50 'call':4,23,82 'caller':100 'catalog':51 'categori':119 'challeng':192 'classif':134 'clear':169 'convers':151 'cost':77 'crawl':231 'crypto paid api' 'data':11,30,120,124 'decim':91 'detail':221 'direct':203 'document':222 'embed':135 'enabl':44 'endpoint':16,35,57,67,118,155,176,184 'estim':145 'exact':179,197 'exampl':224 'exchang':140 'export':125 'feed':139 'financ':13,32,136 'found':228 'four':117 'function':180 'gas':144 'generat':152 'geocod':149 'header':112 'howev':162 'http':193 'infrastructur':147 'insight':126 'key':94 'learn':129 'limit':97 'list':71,154 'live':186 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':128 'map':170 'maximum':213 'metric':122 'micropayment api' 'name':175 'network':64 'no-api-key' 'no-rate-limit' 'offer':10,29 'openapi':219 'path':166 'pay':2,21,54,101 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':111,201 'per':3,22,55,81,102 'platform':6,25,46,115 'post':199 'post-endpoint' 'premium':73 'premium api access' 'price':138,161 'protocol':107 'provid':48 'quot':143 'rate':96,141 'report':123 'request':56,103,200 'request/response':225 'return':188 'schema':220 'scheme':196 'second':217 'sentiment':130 'settl':58 'share':156 'specif':66,164 'summar':133 'text':132 'timeout':214 'token':142 'unit':86 'unknown':182 'usdc':9,28,60,88,208 'usdc api' 'usdc-base' 'use':207 'util':15,34,148 'valid':150,190 'via':104 'wallet':205 'web3':137 'wider':114 'x':110 'x-payment':109 'x402':43,106,191 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e6ed7694-f918-42a3-8d27-d30e71e73386","listingId":"f77a9ba7-8db9-4c85-82da-7f9adf7cff8a","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/180","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.768Z"}],"sources":[{"listingId":"f77a9ba7-8db9-4c85-82da-7f9adf7cff8a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/180","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.768Z","lastSeenAt":"2026-04-22T13:32:23.707Z"}],"details":{"listingId":"f77a9ba7-8db9-4c85-82da-7f9adf7cff8a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/180 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform lists endpoints at $0.02/request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (USD Coin, 6 decimals = $0.02) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/inbox/180"},{"claim":"Payment is directed to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/inbox/180"},{"claim":"The platform advertises categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics or reports on a per-request basis without subscription","Running AI inference (sentiment, summarization, classification, embeddings) with per-call payment","Fetching real-time financial data such as token quotes, exchange rates, or gas estimates","Using utility services like geocoding, validation, or data conversion"],"bestFor":["Agents or developers who want API access without managing API keys or subscriptions","Low-volume or sporadic API consumers who prefer pay-per-use pricing","Crypto-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, schemas, or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.388Z"},"updatedAt":"2026-04-22T13:32:23.707Z"}}