{"id":"1d521c99-3aef-4843-866e-a1fd97e18cee","shortId":"VugXPL","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/125` 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 functionality behind the `/api/v1/inbox/125` path is not documented — the name \"Premium API Access\" is generic and no input/output schema beyond `POST application/json` is provided.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with scheme \"exact\" on the Base network, paying to address `0x1A2B...85F3` using USDC (`0x8335...2913`). The timeout is 300 seconds. Because no detailed documentation, OpenAPI spec, or example payloads are available for this specific endpoint, its actual behavior remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-json","no-api-key","no-rate-limit"],"categories":["api-platform","data","llm","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No documentation exists for the /api/v1/inbox/125 endpoint — its actual functionality is unknown.","No OpenAPI spec, input schema, or example responses are available for any endpoint on this platform.","The /pricing and /README pages returned only a 'Connect wallet' prompt with no content.","The 'Premium API Access' label is generic and does not describe what the endpoint does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/125","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/125","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/125 has no documentation, no input/output schema, and no examples. The description 'Premium API Access' is entirely generic. The broader site lists many endpoints but provides no detail on any of them. Effectively a stub 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'/request':19,38,160 '0.02':18,37,80,159 '000':84 '0x1a2b':211 '0x8335':215 '20':83 '2913':216 '300':220 '402':200 '6':90 '85f3':212 'access':75,177 'actual':238 'address':210 'advertis':99,116 'ai':12,31,127 'analysi':131 'analyt':121 'api':5,24,45,74,93,176 'application/json':186 'avail':232 'base':8,27,63,85,206 'base network api' 'base-network' 'behavior':239 'behind':166 'beyond':184 'broad':50 'call':4,23,82 'caller':100 'catalog':51 'categori':119 'challeng':198 'classif':134 'convers':151 'cost':77 'data':11,30,120,124 'decim':91 'detail':224 'document':172,225 'embed':135 'enabl':44 'endpoint':16,35,57,67,118,155,190,236 'estim':145 'exact':203 'exampl':229 'exchang':140 'export':125 'feed':139 'financ':13,32,136 'four':117 'function':165 'gas':144 'generat':152 'generic':179 'geocod':149 'header':112 'howev':162 'http':199 'infrastructur':147 'input/output':182 'insight':126 'key':94 'learn':129 'limit':97 'list':71,154 'live':192 'low payment fee' 'lowpaymentfee.com':39 'machin':128 'metric':122 'micropayment api' 'name':174 'network':64,207 'no-api-key' 'no-rate-limit' 'offer':10,29 'openapi':226 'path':169 'pay':2,21,54,101,208 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payload':230 'payment':111 'per':3,22,55,81,102 'platform':6,25,46,115 'post':185 'post-json' 'premium':73,175 'premium api access' 'price':138,161 'protocol':107 'provid':48,188 'quot':143 'rate':96,141 'remain':240 'report':123 'request':56,103 'return':194 'schema':183 'scheme':202 'second':221 'sentiment':130 'settl':58 'share':156 'spec':227 'specif':66,164,235 'summar':133 'text':132 'timeout':218 'token':142 'unclear':241 'unit':86 'usdc':9,28,60,88,214 'usdc api' 'usdc-settlement' 'use':213 'util':15,34,148 'valid':150,196 'via':104 'web3':137 'wider':114 'x':110 'x-payment':109 'x402':43,106,197 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b3dfc416-7ff9-4cd3-bdc5-7864b7674b27","listingId":"1d521c99-3aef-4843-866e-a1fd97e18cee","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/125","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.228Z"}],"sources":[{"listingId":"1d521c99-3aef-4843-866e-a1fd97e18cee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/125","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.228Z","lastSeenAt":"2026-04-22T15:02:57.783Z"}],"details":{"listingId":"1d521c99-3aef-4843-866e-a1fd97e18cee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/125 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/125"},{"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 offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/125"}],"useCases":["Paying per-request for data analytics or AI inference without managing API keys","Integrating USDC-settled micropayments into agent workflows on Base","Accessing utility endpoints (geocoding, validation, conversion) with instant crypto payment"],"bestFor":["Agents or developers who want keyless, pay-per-call API access","Crypto-native applications already operating on the Base network","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.402Z"},"updatedAt":"2026-04-22T15:02:57.783Z"}}