{"id":"5f040483-a139-495d-8dc9-c2994eb01ccc","shortId":"9S7YR4","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 utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. No API keys, accounts, or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/14` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`. The payment is sent 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 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during the crawl; the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. The exact functionality behind `/api/v1/messages/14` is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","data-analytics","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion","generation"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","ai inference api","data analytics api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact functionality of /api/v1/messages/14 ('Premium API Access') is not described anywhere in the crawled material","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","No example request or response payloads are available — input format must be guessed","The breadth of advertised endpoints (AI, finance, geo, etc.) could not be independently verified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/14","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/14","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 USDC on Base), but there is no OpenAPI schema, no documentation, no example requests or responses, and the purpose of /api/v1/messages/14 specifically is unexplained. The crawled pages beyond the landing page returned no useful 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'/api/v1/messages/14':100,222 '/pricing':203 '/readme':205 '/request':18,36 '0.02':17,35,67,127,183 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x8335':121 '20':115 '2913':122 '300':150 '6':131 'accept':135 'access':106 'account':80 'addit':157 'address':146 'advertis':85,110,156 'ai':11,29 'ai inference api' 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':161 'analyt':12,30,54 'api':5,23,43,78,105 'application/json':140 'attach':88 'avail':227 'base':8,26,75,117,124 'base network api' 'behind':221 'broad':48 'broader':154 'call':4,22 'caller':86 'challeng':109 'classif':164 'collect':49 'connect':211 'content':217 'convers':176 'conversion' 'cost':113 'cover':10,28 'crawl':200 'crypto-quotes' 'data':53,58 'data analytics api' 'data-analytics' 'decim':132 'detail':190 'document':191 'embed':165 'enabl':42 'endpoint':51,63,98,134,158 'equal':126 'estim':173 'everi':62 'exact':219 'exampl':193 'exchang':168 'feed':167 'financ':13,31 'finance-data' 'finance/web3':57 'found':197 'function':220 'gas':172 'gas-estimates' 'general':60 'generat':178 'generation' 'geocod':174 'geocoding' 'given':128 'header':92 'howev':186 'http':136 'includ':159 'infer':56 'key':79 'limit':83 'list':102 'low payment fee' 'lowpaymentfee.com':37 'materi':228 'maximum':112 'micropayment api' 'network':76 'offer':46 'openapi':188 'page':206 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-call' 'payload':195 'payment':91,142 'per':3,21,68 'platform':44,155 'point':185 'post':137 'premium':104 'price':65,166,184 'prompt':213 'quot':171 'rate':82,169 'request':69,95 'request/response':194 'return':139,208 'schema':189 'second':151 'sent':144 'sentiment':160 'settl':70 'simpli':87 'span':52 'specif':97 'substant':216 'suit':6,24 'summar':163 'text':162 'timeout':152 'token':170 'unclear':224 'unit':118 'usdc':9,27,72,120,129 'usdc api' 'usdc-base' 'util':15,33,61 'valid':175 'validation' 'wallet':212 'x402':41,90,108 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"4992dc40-2f8b-48e7-aaf0-171071a217fb","listingId":"5f040483-a139-495d-8dc9-c2994eb01ccc","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/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.305Z"}],"sources":[{"listingId":"5f040483-a139-495d-8dc9-c2994eb01ccc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.305Z","lastSeenAt":"2026-04-22T05:32:16.201Z"}],"details":{"listingId":"5f040483-a139-495d-8dc9-c2994eb01ccc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/14 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{\"message\": \"hello\"}'","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/14"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/14"},{"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":["Agent-driven AI inference (sentiment, summarization, classification, embeddings) with per-call USDC payment","Fetching real-time crypto token quotes, gas estimates, and exchange rates without API key management","On-demand geocoding, data validation, and format conversion via micropayments","Exporting analytics data and generating insights reports programmatically"],"bestFor":["AI agents that need low-friction, keyless API access with crypto micropayments","Developers prototyping against multiple utility endpoints without signup or subscription","Web3-native applications that prefer on-chain settlement for API consumption"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Callers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.23Z"},"updatedAt":"2026-04-22T05:32:16.201Z"}}