{"id":"b4a115b1-4ef7-402a-8235-c08764e06f53","shortId":"4LFN7p","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 `/api/v1/inbox/13` 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, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each POST request.\n\nThe platform advertises four categories of APIs: 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. The x402 challenge was successfully captured with version 1 of the protocol, confirming the endpoint is live.\n\nNotably, the specific `/api/v1/inbox/13` endpoint does not correspond to any of the named API categories on the landing page. Its purpose is unclear — it may be a generic inbox or message-passing endpoint. No OpenAPI schema, request/response examples, or detailed documentation were found during the crawl; the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["The endpoint /api/v1/inbox/13 does not match any named API on the provider's landing page — its actual functionality is unknown.","No OpenAPI spec, request schema, or response schema available.","No documentation pages returned substantive content (all showed only 'Connect wallet').","The 'Premium API Access' description is generic and does not explain what this endpoint does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/13","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/13","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 USDC on Base), but there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page listing, and the specific endpoint /api/v1/inbox/13 has no description of its actual functionality. The /api, /pricing, and /README pages returned no useful 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'/api/v1/inbox/13':68,181 '/pricing':227 '/readme':229 '/request':19,38,159 '0.02':18,37,79,158 '000':83 '1':169 '20':82 '402 payment required' '6':89 'access':74 'advertis':114 'ai':12,31,126 'analysi':130 'analyt':120 'api':5,24,45,73,92,118,191 'attach':103 'base':8,27,63,84 'base network api' 'broad':50 'call':4,23 'caller':101 'captur':166 'catalog':51 'categori':116,192 'challeng':163 'classif':133 'commit':98 'confirm':173 'connect':235 'content':241 'convers':150 'correspond':185 'cost':76 'crawl':224 'data':11,30,119,123 'decim':90 'detail':218 'document':219 'embed':134 'enabl':44 'endpoint':16,35,57,67,154,175,182,211 'estim':144 'exampl':216 'exchang':139 'export':124 'feed':138 'financ':13,32,135 'found':221 'four':115 'gas':143 'generat':151 'generic':205 'geocod':148 'header':107 'inbox':206 'infrastructur':146 'insight':125 'key':93 'land':195 'learn':128 'limit':95 'list':70,153 'live':177 'low payment fee' 'lowpaymentfee.com':39 'machin':127 'may':202 'messag':209 'message-pass':208 'metric':121 'micropayment api' 'name':190 'network':64 'no-api-key' 'no-rate-limit' 'notabl':178 'offer':10,29 'openapi':213 'page':196,230 'pass':210 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':106 'per':3,22,55,80 'platform':6,25,46,113 'post':110 'post-endpoint' 'premium':72 'price':137,160 'prompt':237 'protocol':172 'provid':48 'purpos':198 'quot':142 'rate':94,140 'report':122 'request':56,81,111 'request/response':215 'requir':100 'return':232 'schema':214 'sentiment':129 'settl':58 'share':155 'simpli':102 'specif':66,180 'substant':240 'success':165 'summar':132 'text':131 'token':141 'unclear':200 'unit':85 'upfront':97 'usdc':9,28,60,87 'usdc api' 'usdc-base' 'util':15,34,147 'valid':149 'version':168 'wallet':236 'web3':136 'x402':43,105,162 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"571788bc-62c9-483d-9b02-c42fe6cdb6d3","listingId":"b4a115b1-4ef7-402a-8235-c08764e06f53","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.406Z"}],"sources":[{"listingId":"b4a115b1-4ef7-402a-8235-c08764e06f53","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.406Z","lastSeenAt":"2026-04-22T18:33:13.772Z"}],"details":{"listingId":"b4a115b1-4ef7-402a-8235-c08764e06f53","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/13 \\\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 x402 challenge returns maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base, equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/inbox/13"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to utility or data endpoints without needing API key registration","Agent-driven workflows that pay per call using USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","AI agents needing keyless, pay-per-use API access","Low-volume consumers who want no subscription commitment"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume production workloads where $0.02/request adds up quickly","Anyone who needs to understand exactly what /api/v1/inbox/13 returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.14Z"},"updatedAt":"2026-04-22T18:33:13.772Z"}}