{"id":"fcb78946-69dc-4b70-8cea-e5be1d10bf02","shortId":"rxUyr9","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 access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/168` 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 advertised — 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/168` 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 maximum timeout is 300 seconds. No OpenAPI schema, detailed documentation, or example responses were found during crawling — the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive 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","cheap api access","402 payment api"],"warnings":["The exact functionality of /api/v1/inbox/168 ('Premium API Access') is not documented anywhere — it is unclear what data or service it returns.","No OpenAPI schema, example requests, or example responses are available for any endpoint on the platform.","The /pricing, /api, and /README pages returned no useful content (only 'Connect wallet').","The broader platform lists many endpoint categories but none could be verified beyond the landing page descriptions."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/168","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/168","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, confirming pricing and payment details. However, the specific functionality of /api/v1/inbox/168 is undocumented, no OpenAPI schema exists, no example responses are available, and the /api, /pricing, and /README pages are empty beyond a wallet-connect prompt. The listing is essentially a stub with confirmed 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'/api/v1/inbox/168':67,167 '/pricing':234 '/readme':236 '/request':17,34,159 '0.02':16,33,85,158 '000':79 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':206 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':213 '1':198 '20':78 '300':218 '402 payment api' '6':91 'access':45,73,177 'address':205 'advertis':100,114 'ai':10,27,126 'ai-inference' 'analysi':130 'analyt':120 'api':4,21,41,72,94,176 'attach':103 'base':7,24,61,80,210 'base usdc api' 'behind':51,165 'beyond':172 'broader':112 'caller':101 'canon':209 'categori':116 'challeng':196 'charg':75 'cheap api access' 'classif':133 'classification' 'connect':242 'content':248 'contract':212 'convers':150 'crawl':231 'data':9,26,119,123 'data-analytics' 'decim':92 'detail':223 'direct':203 'document':171,224 'embed':134 'embeddings' 'endpoint':14,31,50,65,118,154,186 'estim':144 'exact':181,200 'exampl':226 'exchang':139 'export':124 'feed':138 'financ':11,28,135 'finance-data' 'form':194 'found':229 'four':115 'function':164 'gas':143 'gate':3,20,44 'generat':151 'generic':174 'geocod':148 'geocoding' 'header':107 'howev':161 'i.e':84 'infrastructur':146 'insight':125 'key':95 'label':178 'learn':128 'limit':98 'list':69,153 'live':188 'low payment fee' 'lowpaymentfee.com':35 'machin':127 'marketplac':42 'maximum':215 'metric':121 'micropay':55 'micropayment api' 'network':62 'offer':8,25 'openapi':221 'page':237 'path':168 'pay-per-request api' 'payment':106,202 'per':53,86 'per-request':52 'per-request-micropayment' 'platform':5,22,113 'premium':71,175 'price':137,160 'prompt':244 'protocol':40 'purpos':182 'quot':142 'rate':97,140 'report':122 'request':54,87,110 'respons':227 'return':190,239 'schema':222 'scheme':199 'second':219 'sentiment':129 'sentiment-analysis' 'settl':56 'share':155 'simpli':102 'sinc':88 'specif':64,163 'substant':247 'summar':132 'text':131 'text-summarization' 'timeout':216 'token':141 'unclear':184 'unit':81 'usdc':58,83,89,211 'usdc-base' 'use':90,207 'util':13,30,147 'utility-apis' 'valid':149 'varieti':48 'version':197 'wallet':243 'web3':136 'well':193 'well-form':192 'x402':2,19,39,105,195 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"2a7aa3ee-2932-4a92-bf80-206053f2899f","listingId":"fcb78946-69dc-4b70-8cea-e5be1d10bf02","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/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.731Z"}],"sources":[{"listingId":"fcb78946-69dc-4b70-8cea-e5be1d10bf02","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/168","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.731Z","lastSeenAt":"2026-04-22T07:02:04.058Z"}],"details":{"listingId":"fcb78946-69dc-4b70-8cea-e5be1d10bf02","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/168 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/168","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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/168"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/168"},{"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":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates via micropayments","Running utility operations like geocoding, validation, or data conversion on a pay-as-you-go basis","Exporting analytics data or generating insights without subscription commitments"],"bestFor":["Agents or developers who want keyless, pay-per-use API access settled on-chain","Low-volume or bursty workloads where subscription pricing is wasteful","x402-compatible AI agents that can autonomously pay for API calls on Base"],"notFor":["High-volume production workloads where $0.02/request adds up quickly compared to bulk-priced alternatives","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.488Z"},"updatedAt":"2026-04-22T07:02:04.058Z"}}