{"id":"9e1e1ae8-4499-4354-ab3f-c96afb588b43","shortId":"vUEccX","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general infrastructure utilities. Every endpoint is 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 required.\n\nThe specific endpoint at `/api/v1/messages/11` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST requests and returns `application/json`. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 per-call price point. However, no OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawl. The `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no substantive content. Without documentation it is unclear what request bodies these endpoints expect or what response shapes they return.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","data-analytics","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion","data-export"],"categories":["llm","finance","geo","data"],"synonyms":["low payment fee","x402 API","pay per request API","USDC API","Base network API","micro-payment API","sentiment analysis API","text summarization API"],"warnings":["No OpenAPI or schema documentation found for any endpoint","The purpose of /api/v1/messages/11 specifically is unclear — 'Premium API Access' is generic","All sub-pages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content","No request body format or response schema is documented anywhere in the crawl","The breadth of advertised capabilities (AI, finance, geocoding, etc.) cannot be verified without docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/11","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/messages/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/call in USDC on Base). However, there is no OpenAPI schema, no request/response documentation, no examples, and the specific endpoint's purpose (\"Premium API Access\" at /api/v1/messages/11) is unexplained. The crawl yielded only a landing page listing endpoints and empty wallet-connect 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'/api/v1/messages/11':97 '/pricing':205 '/readme':207 '/request':18,36 '0.02':17,35,68,123,182 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':118 '20':112 '300':149 '6':127 'Base network API' 'USDC API' 'accept':131 'access':103 'addit':156 'address':145 'advertis':107,155 'ai':11,29 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':160 'analyt':12,30,54 'api':5,23,43,83,102 'application/json':137 'base':8,26,76,114,120 'bodi':227 'broad':48 'broader':153 'call':4,22,185 'chain':143 'challeng':106 'classif':163 'collect':49 'commit':91 'connect':213 'content':219 'convers':175 'conversion' 'cost':110 'cover':10,28 'crawl':202 'crypto-gas-estimates' 'data':53,58 'data-analytics' 'data-export' 'decim':128 'detail':192 'document':194,221 'embed':164 'enabl':42 'endpoint':51,64,95,130,157,229 'equal':122 'estim':172 'everi':63 'exampl':197 'exchang':167 'exchange-rates' 'expect':230 'feed':166 'financ':13,31 'finance-price-feeds' 'finance/web3':57 'found':199 'gas':171 'general':60 'generat':177 'geocod':173 'geocoding' 'given':124 'howev':188 'http':132 'includ':158 'infer':56 'infrastructur':61 'key':84 'limit':87 'list':99 'low payment fee' 'lowpaymentfee.com':37 'maximum':109 'micro-payment API' 'network':77 'offer':46 'on-chain':141 'openapi':190 'page':208 'pay':2,20 'pay per request API' 'pay-per-cal':1,19 'pay-per-call' 'payabl':71 'payment':138 'per':3,21,69,184 'per-cal':183 'platform':44,154 'point':187 'post':133 'premium':101 'price':66,165,186 'prompt':215 'protocol':81 'quot':170 'rate':86,168 'request':70,134,226 'request/response':193 'requir':92 'respons':233 'return':136,210,236 'schema':191 'second':150 'sentiment':159 'sentiment analysis API' 'settl':140 'shape':234 'span':52 'specif':94 'substant':218 'suit':6,24 'summar':162 'text':161 'text summarization API' 'timeout':151 'token':169 'unclear':224 'unit':115 'upfront':90 'usag':196 'usdc':9,27,73,117,125 'usdc-base' 'util':15,33,62 'valid':174 'validation' 'via':78 'wallet':214 'without':220 'x402':41,80,105 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"0ed14dc5-5421-4c74-85cd-f714a2059c14","listingId":"9e1e1ae8-4499-4354-ab3f-c96afb588b43","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/messages/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.846Z"}],"sources":[{"listingId":"9e1e1ae8-4499-4354-ab3f-c96afb588b43","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.846Z","lastSeenAt":"2026-04-22T07:02:09.474Z"}],"details":{"listingId":"9e1e1ae8-4499-4354-ab3f-c96afb588b43","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/11 \\\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":"Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/11"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/11"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Running one-off AI inference tasks (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes or gas estimates via a single paid call","Geocoding addresses or validating data on demand with per-call billing","Exporting analytics data or generating insights without subscription commitments"],"bestFor":["Agents or bots that need keyless, pay-as-you-go API access","Low-volume or sporadic callers who want to avoid subscriptions","Developers experimenting with x402 protocol payments on Base"],"notFor":["High-volume production workloads where $0.02/call adds up quickly","Users who need detailed API documentation or SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.928Z"},"updatedAt":"2026-04-22T07:02:09.474Z"}}