{"id":"4ec9c13b-85c6-4f42-bf28-201bcdc7a782","shortId":"x6XRqM","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints 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 market data, and general-purpose utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/163` is listed as \"Premium API Access\" and follows the same x402 payment pattern. Its exact functionality is not documented beyond the generic title; it may be a messaging or content-retrieval endpoint. The x402 challenge confirms it is live, accepting POST requests, and requires up to 20,000 base units of USDC (i.e., $0.02) per call on the Base L2 network.\n\nThe broader platform advertises categories including: metrics and reports (analytics), sentiment analysis, text summarization, classification, embeddings (AI/ML), price feeds, exchange rates, token quotes, gas estimates (finance/crypto), and geocoding, validation, conversion, and generation (utilities). All share the same $0.02 flat pricing model. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no further detail.","tags":[],"capabilities":["x402-payment","usdc-base-settlement","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion","text-generation"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["The exact purpose and expected request/response format of /api/v1/messages/163 is undocumented — 'Premium API Access' is a generic label.","No OpenAPI spec, no request/response schemas, and no example payloads are available for any endpoint.","All secondary pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no documentation content.","The breadth of advertised endpoints (analytics, AI, finance, utilities) is unverifiable — none have documented schemas or sample outputs."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/163","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/163","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 confirms pricing and network details, but there is no OpenAPI schema, no request/response documentation, and the specific endpoint's purpose ('Premium API Access' at /messages/163) is undefined. The /api, /pricing, and /README pages are all blank beyond a wallet-connect prompt, leaving nearly all functional details to 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'/api/v1/messages/163':108 '/pricing':221 '/readme':223 '/request':19,38 '0.02':18,37,72,163,208 '000':157 '20':156 'accept':149 'access':114 'advertis':174 'ai':12,31 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':57,187 'analysi':182 'analyt':56,180 'api':5,24,45,85,113 'attach':96 'base':8,27,80,158,168 'base network api' 'beyond':128,213 'broad':50 'broader':172 'call':4,23,165 'caller':94 'categori':175 'challeng':144 'classif':185 'collect':51 'commit':93 'confirm':145 'connect':230 'content':139 'content-retriev':138 'convers':200 'conversion' 'cover':10,29 'crypto-gas-estimates' 'data':11,30,55,61 'data-analytics' 'detail':236 'document':127,212 'embed':186 'enabl':44 'endpoint':16,35,53,68,106,141 'estim':195 'everi':67 'exact':123 'exchang':190 'exchange-rates' 'feed':189 'financ':13,32 'finance-price-feeds' 'finance/crypto':196 'finance/web3':59 'flat':209 'follow':116 'function':124 'gas':194 'general':64 'general-purpos':63 'generat':202 'generic':130 'geocod':198 'geocoding' 'header':100 'i.e':162 'includ':176 'infer':58 'key':86 'l2':169 'land':215 'limit':89 'list':110 'live':148 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'market':60 'may':133 'messag':136 'metric':177 'micropayment api' 'minim':229 'minimum':92 'model':211 'network':81,170 'offer':48 'page':216,224 'pattern':121 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':99,120 'per':3,22,73,164 'platform':46,173 'post':150 'premium':112 'price':70,188,210 'prompt':232 'purpos':65 'quot':193 'rate':88,191 'report':179 'request':74,103,151 'requir':153 'resolv':226 'retriev':140 'sentiment':181 'settl':75 'share':205 'simpli':95 'span':54 'spars':218 'specif':105 'suit':6,25 'summar':184 'text':183 'text-generation' 'titl':131 'token':192 'unit':159 'usdc':9,28,77,161 'usdc api' 'usdc-base-settlement' 'util':15,34,66,203 'valid':199 'validation' 'wallet':231 'x402':43,98,119,143 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"3c4400a9-39bf-48b6-b40f-d42e52be2c8e","listingId":"4ec9c13b-85c6-4f42-bf28-201bcdc7a782","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/163","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.060Z"}],"sources":[{"listingId":"4ec9c13b-85c6-4f42-bf28-201bcdc7a782","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/163","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.060Z","lastSeenAt":"2026-04-22T05:32:15.857Z"}],"details":{"listingId":"4ec9c13b-85c6-4f42-bf28-201bcdc7a782","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/163 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/163","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge requiring up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/163"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/163"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC micropayments","Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) without API key management","Accessing utility services like geocoding, data validation, and format conversion on a pay-as-you-go basis","Integrating agent-driven workflows that need low-friction, keyless API access settled on-chain"],"bestFor":["Developers and agents wanting keyless, pay-per-use API access","Prototyping and low-volume usage where subscription plans are overkill","On-chain-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads that need SLAs, rate-limit guarantees, or dedicated support","Users who need detailed API documentation, request/response schemas, or sandbox environments before committing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.568Z"},"updatedAt":"2026-04-22T05:32:15.857Z"}}