{"id":"6d783394-d836-4fd6-801c-11da6a838558","shortId":"Pbguut","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, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/inbox/7` is listed as \"Premium API Access\" and returns a live 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nNote that while the landing page advertises many endpoints, the crawled documentation pages (/api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the site. The exact functionality behind `/api/v1/inbox/7` (\"Premium API Access\") is unclear — it does not map to any of the named endpoints on the landing page. Treat this listing with caution until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — all doc pages return only 'Connect wallet'","The endpoint path /api/v1/inbox/7 does not correspond to any named endpoint on the landing page; its actual functionality is unknown","No request body schema or response schema documented anywhere","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/7","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no usage examples, and the specific endpoint '/api/v1/inbox/7' is not described anywhere on the site. Documentation pages returned only wallet-connect prompts. Functionality must be 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'/api/v1/inbox/7':122,226 '/pricing':191 '/readme':192 '/request':19,38 '0.02':18,37,95,144 '000':139 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':163 '20':138 '300':166 '402':133 '6':149 'accept':171 'access':128,229 'across':54 'address':162 'advertis':183 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,127,228 'application/json':176 'avail':218 'base':8,27,103,140,152 'base network api' 'behind':225 'broad':50 'call':4,23 'catalog':51 'categori':56 'caution':250 'challeng':134 'classif':71 'classification' 'commit':118 'connect':197 'convers':88 'crawl':187 'data':11,30,57,61 'data-analytics' 'decim':150 'detail':204 'document':188,213,253 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,170,185,241 'estim':82 'exact':159,223 'exampl':217 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':224 'gas':81 'generat':89 'geocod':86 'geocoding' 'http':172 'infrastructur':84 'insight':63 'key':111 'land':181,244 'learn':66 'limit':114 'list':124,248 'live':132 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':155 'mani':184 'map':235 'metric':59 'micropayment api' 'name':240 'network':104 'note':177 'offer':10,29 'openapi':208 'page':182,189,245 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payabl':98 'payment':153 'per':3,22,96 'platform':6,25,46 'post':173 'premium':126,227 'price':75,93 'prompt':199 'protocol':108 'quot':80 'rate':78,113 'report':60 'request':97,135 'request/response':211 'return':130,175,194 'schema':212 'scheme':160 'second':167 'sentiment':67 'sentiment-analysis' 'sinc':146 'site':221 'spec':209 'specif':120 'summar':70 'surfac':254 'technic':203 'text':69 'text-summarization' 'timeout':168 'token':79 'treat':246 'unclear':231 'unit':141 'upfront':117 'usag':216 'usd':145 'usdc':9,28,100,143,147 'usdc api' 'usdc-base' 'use':148 'util':15,34,85 'utility-apis' 'valid':87 'via':105,156 'wallet':198 'web3':74 'x402':43,107,158 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"c9005cfa-8f05-4717-a42e-5a289dae3052","listingId":"6d783394-d836-4fd6-801c-11da6a838558","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.711Z"}],"sources":[{"listingId":"6d783394-d836-4fd6-801c-11da6a838558","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.711Z","lastSeenAt":"2026-04-22T04:02:46.135Z"}],"details":{"listingId":"6d783394-d836-4fd6-801c-11da6a838558","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/7 \\\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 priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint returns 402 with maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/7"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","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, gas estimates, and exchange rates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-use analytics and data export into agent workflows"],"bestFor":["AI agents needing low-friction, keyless API access via crypto micropayments","Developers prototyping with multiple API categories without subscription commitments","Web3-native applications that can settle USDC on Base"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads that benefit from bulk pricing or rate-limit guarantees","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.997Z"},"updatedAt":"2026-04-22T04:02:46.135Z"}}