{"id":"a3a42e9d-704e-43d9-9e48-ab2353b6011f","shortId":"gzNVjg","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/134` 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 the specified payTo address. The endpoint accepts HTTP POST and returns application/json.\n\nNote that while the landing page advertises many endpoints, the crawled documentation is extremely thin — the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no further detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual functionality behind `/api/v1/inbox/134` (as opposed to the named category endpoints) is unclear from the available material.","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":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api, /pricing, and /README pages contain no useful content beyond 'Connect wallet'","The specific endpoint /api/v1/inbox/134 is labeled 'Premium API Access' but its actual functionality is undocumented and does not match any of the named category endpoints on the landing page","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/134","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/134","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 402 challenge, but there is no OpenAPI spec, no request/response schema, no examples, and the documentation pages are empty beyond a wallet-connect prompt. The purpose of the specific /inbox/134 path is unclear. Effectively a stub 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'/api/v1/inbox/134':122,224 '/pricing':191 '/readme':193 '/request':19,38 '0.02':18,37,95,144 '000':139 '20':138 '402':133 '402 payment api' '6':149 'accept':168 'access':128 'across':54 'actual':221 'address':165 'advertis':180 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,127 'application/json':173 'avail':219,236 'base':8,27,103,140,152 'base network api' 'behind':223 'broad':50 'call':4,23 'catalog':51 'categori':56,230 'challeng':134 'classif':71 'classification' 'commit':118 'connect':199 'convers':88 'crawl':184 'data':11,30,57,61 'data-analytics' 'decim':150 'detail':205 'document':185,214 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,167,182,231 'estim':82 'exact':159 'exampl':218 'exchang':77 'export':62 'expos':48 'extrem':187 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':222 'gas':81 'generat':89 'geocod':86 'geocoding' 'http':169 'infrastructur':84 'insight':63 'key':111 'land':178 'learn':66 'limit':114 'list':124 'live':132 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':155 'mani':181 'materi':237 'metric':59 'micropayment api' 'name':229 'network':104 'note':174 'offer':10,29 'openapi':209 'oppos':226 'page':179,194 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payabl':98 'payment':153 'payto':164 'per':3,22,96 'platform':6,25,46 'post':170 'premium':126 'price':75,93 'prompt':201 'protocol':108 'quot':80 'rate':78,113 'report':60 'request':97,135 'request/response':212 'resolv':196 'return':130,172 'schema':213 'scheme':160 'sentiment':67 'sentiment-analysis' 'sinc':146 'spec':210 'specif':120 'specifi':163 'summar':70 'text':69 'text-summarization' 'thin':188 'token':79 'unclear':233 'unit':141 'upfront':117 'usag':217 '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':200 'web3':74 'x402':43,107,158 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2116dc51-e119-455c-b19f-9f0cbedeb374","listingId":"a3a42e9d-704e-43d9-9e48-ab2353b6011f","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/134","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.250Z"}],"sources":[{"listingId":"a3a42e9d-704e-43d9-9e48-ab2353b6011f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/134","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.250Z","lastSeenAt":"2026-04-22T12:05:15.266Z"}],"details":{"listingId":"a3a42e9d-704e-43d9-9e48-ab2353b6011f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/134 \\\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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/134 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/134"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) without API key management","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call payment basis","Accessing utility services like geocoding, validation, and data conversion with micropayments"],"bestFor":["Agents or developers who want instant API access without signup or API keys","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions","Crypto-native applications already operating on the Base network with USDC"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.396Z"},"updatedAt":"2026-04-22T12:05:15.266Z"}}