{"id":"91be6d70-5b9f-433b-a224-be4fc20e5288","shortId":"J6nr97","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 exposes a broad catalog of endpoints across four 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 endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/inbox/119` is listed as \"Premium API Access\" with a max amount of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). It accepts HTTP POST requests and returns application/json. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The x402 challenge was confirmed live, returning a proper 402 response with payment parameters.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but there is no OpenAPI spec, no request/response schema documentation, and no usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. Without knowing the expected POST body or the structure of responses, callers will need to experiment or contact the provider. The purpose of the `/api/v1/inbox/119` path specifically (as opposed to the named endpoints like `/api/v2/ai/sentiment`) is unclear — it may be a generic or catch-all premium access route.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api","crypto api gateway"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","The specific endpoint /api/v1/inbox/119 is not listed among the named endpoints on the landing page; its exact function is unclear","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","No examples, error codes, or rate limit information provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/119","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/119","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/inbox/119 is ambiguous. Effectively a stub 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'/api/v1/inbox/119':113,243 '/api/v2/ai/sentiment':253 '/pricing':204 '/readme':206 '/request':19,38 '0.02':18,37,95,131 '000':126 '20':125 '402':172 '402 payment api' '6':136 'accept':139 'access':119,266 'across':54 'addit':217 'ai':12,31,64 'ai-inference' 'amount':123 'analysi':68 'analyt':58 'api':5,24,45,118,155 'application/json':145 'avail':184 'base':8,27,103,127 'base network api' 'bodi':224 'broad':50 'call':4,23 'caller':230 'catalog':51 'catch':263 'catch-al':262 'categori':56 'challeng':165 'classif':71 'classification' 'confirm':167 'connect':212 'contact':236 'content':218 'convers':88 'conversion' 'crypto api gateway' 'data':11,30,57,61 'data-analytics' 'decim':137 'document':177,197 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,185,251 'estim':82 'exact':152 'exampl':201 'exchang':77 'exchange-rates' 'expect':222 'experi':234 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'gas-estimates' 'generat':89 'generic':260 'geocod':86 'geocoding' 'http':140 'infrastructur':84 'insight':63 'key':156 'know':220 'land':181 'learn':66 'like':252 'limit':160 'list':115,183 'live':168 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':148 'max':122 'may':257 'metric':59 'micropayment api' 'minim':179 'name':250 'need':232 'network':104 'offer':10,29 'openapi':192 'oppos':247 'page':182,207 'paramet':176 'path':244 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':146,175 'per':3,22,96 'platform':6,25,46 'post':141,223 'premium':117,265 'price':75,93,187 'prompt':214 'proper':171 'protocol':108 'provid':238 'purpos':240 'quot':80 'rate':78,159 'report':60 'request':97,142 'request/response':195 'requir':162 'resolv':209 'respons':173,229 'return':144,169 'rout':267 'schema':196 'scheme':153 'sentiment':67 'sentiment-analysis' 'settl':98 'sinc':133 'spec':193 'specif':110,245 'structur':227 'subscript':157 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':255 'unit':128 'usag':200 'usd':132 'usdc':9,28,100,130,134 'usdc api' 'usdc-base' 'use':135 'util':15,34,85 'valid':87 'validation' 'via':105,149 'wallet':213 'web3':74 'without':219 'x402':43,107,151,164 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"35b87b01-396e-4be2-b861-bcf23a9ffff3","listingId":"91be6d70-5b9f-433b-a224-be4fc20e5288","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/119","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.573Z"}],"sources":[{"listingId":"91be6d70-5b9f-433b-a224-be4fc20e5288","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/119","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.573Z","lastSeenAt":"2026-04-22T10:02:55.834Z"}],"details":{"listingId":"91be6d70-5b9f-433b-a224-be4fc20e5288","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/119 \\\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":"All endpoints are priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on the Base network via x402 exact scheme","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/119 returns maxAmountRequired of 20000 base units (0.02 USDC)","source_url":"https://lowpaymentfee.com/api/v1/inbox/119"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys or rate limits required","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, data validation, and format conversion on a per-call basis","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["AI agents needing on-demand access to diverse API capabilities without subscriptions","Developers who want to avoid API key provisioning and rate limit management","Low-volume or bursty workloads where flat per-request pricing ($0.02) is cost-effective"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.742Z"},"updatedAt":"2026-04-22T10:02:55.834Z"}}