{"id":"ce83be6a-02f0-40bd-9f30-4b573902c2ef","shortId":"Cnb7MB","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/51` is listed as \"Premium API Access\" and costs up to $0.02 per request (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/51` path does not clearly map to any of these named endpoints, and no documentation describes what this particular inbox endpoint returns.\n\nThe x402 challenge confirms the endpoint is live, accepts POST requests, and settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. No OpenAPI schema, request/response examples, or detailed documentation were found for this endpoint or any other endpoint on the platform.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"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":["The endpoint path '/api/v1/inbox/51' does not correspond to any of the named endpoints listed on the homepage — its actual functionality is unknown.","No OpenAPI schema, request body format, or response examples are available for any endpoint on this platform.","Documentation pages (/api, /pricing, /README) returned no meaningful content beyond 'Connect wallet'.","The platform lists many endpoint categories (AI, finance, data, etc.) but none could be verified for actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/51","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base), but the specific endpoint '/api/v1/inbox/51' has no documentation, no request/response schema, and no description beyond the generic 'Premium API Access' label. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'/request':19,38,160 '0.02':18,37,80,159 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':203 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':206 '20':83 '6':90 'accept':195 'access':75 'address':202 'advertis':99,116 'ai':12,31,127 'analysi':131 'analyt':121 'api':5,24,45,74,93 'base':8,27,63,85,208 'base network api' 'base-network' 'broad':50 'call':4,23 'caller':100 'catalog':51 'categori':119 'challeng':189 'classif':134 'clear':169 'confirm':190 'convers':151 'cost':77 'data':11,30,120,124 'decim':91 'describ':180 'detail':215 'document':179,216 'embed':135 'enabl':44 'endpoint':16,35,57,67,118,155,176,185,192,221,225 'estim':145 'exampl':213 'exchang':140 'export':125 'feed':139 'financ':13,32,136 'found':218 'four':117 'gas':144 'generat':152 'geocod':149 'header':112 'howev':162 'inbox':184 'infrastructur':147 'insight':126 'key':94 'learn':129 'limit':97 'list':71,154 'live':194 'low payment fee' 'lowpaymentfee.com':39 'machin':128 'map':170 'metric':122 'micropayment api' 'name':175 'network':64 'no-api-key' 'offer':10,29 'openapi':210 'particular':183 'path':166 'pay':2,21,54,101 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':111,200 'per':3,22,55,81,102 'platform':6,25,46,115,228 'post':196 'post-endpoint' 'premium':73 'premium api access' 'price':138,161 'protocol':107 'provid':48 'quot':143 'rate':96,141 'report':123 'request':56,82,103,197 'request/response':212 'return':186 'schema':211 'sentiment':130 'settl':58,199 'share':156 'specif':66,164 'summar':133 'text':132 'token':142 'unit':86 'usdc':9,28,60,88,205 'usdc api' 'usdc-settlement' 'use':204 'util':15,34,148 'valid':150 'via':104 'web3':137 'wider':114 'x':110 'x-payment':109 'x402':43,106,188 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"8e4c371e-e8d2-4754-b38d-ac6192528c4c","listingId":"ce83be6a-02f0-40bd-9f30-4b573902c2ef","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.636Z"}],"sources":[{"listingId":"ce83be6a-02f0-40bd-9f30-4b573902c2ef","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.636Z","lastSeenAt":"2026-04-22T04:02:46.059Z"}],"details":{"listingId":"ce83be6a-02f0-40bd-9f30-4b573902c2ef","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/51 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/51"},{"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"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/51"}],"useCases":["Paying per request for API access without needing API keys or subscriptions","Integrating x402 payment-gated endpoints into agent workflows","Accessing utility or data endpoints with USDC micropayments on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Projects already operating on the Base L2 with USDC"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.099Z"},"updatedAt":"2026-04-22T04:02:46.059Z"}}