{"id":"89dfc356-228f-441f-a9f9-8099af6cf624","shortId":"z9z3Nk","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform 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 catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/87` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider platform advertises four endpoint 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 uniformly priced at $0.02 per request.\n\nThe specific `/api/v1/messages/87` endpoint does not clearly map to any of the advertised categories — it may be a messaging or content-retrieval endpoint, but no documentation beyond the title \"Premium API Access\" is available. The endpoint is confirmed live (returns a proper 402 challenge). No OpenAPI schema, detailed docs, or example responses were found during the crawl; the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limits","data-analytics","ai-inference","finance-data","utility-services"],"categories":["general","llm","finance"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-call","USDC API","Base network API","premium API access"],"warnings":["No documentation or schema available for /api/v1/messages/87 — its purpose beyond 'Premium API Access' is unknown","The /api, /pricing, and /README pages returned only 'Connect wallet' with no content","No example request or response bodies could be obtained","The endpoint path '/api/v1/messages/87' does not match any of the advertised API categories on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/87","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and basic pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation for the /messages/87 endpoint specifically, no example request/response bodies, and the crawled pages beyond the homepage returned no useful content. The purpose of this specific endpoint is 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'/api/v1/messages/87':69,172 '/pricing':230 '/readme':232 '/request':19,38 '0.02':18,37,80,167 '000':84 '20':83 '402':213 '6':90 'Base network API' 'USDC API' 'access':75,202 'account':102 'advertis':124,182 'ai':12,31,135 'ai-inference' 'analysi':139 'analyt':129 'api':5,24,45,74,100,201 'attach':110 'avail':204 'base':8,27,63,85 'beyond':197 'broad':50 'call':4,23,82 'caller':108 'catalog':51 'categori':127,183 'challeng':214 'classif':142 'clear':176 'confirm':208 'connect':238 'content':191,244 'content-retriev':190 'convers':159 'cost':77 'cover':10,29 'crawl':227 'data':11,30,128,132 'data-analytics' 'decim':91 'detail':218 'doc':219 'document':196 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,162,173,193,206 'estim':153 'exampl':221 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'finance-data' 'found':224 'four':125 'gas':152 'generat':160 'geocod':157 'handl':94 'header':115 'infrastructur':155 'insight':134 'key':101 'learn':137 'limit':105 'list':71 'live':209 'low payment fee' 'lowpaymentfee.com':39 'machin':136 'map':177 'may':185 'messag':188 'metric':130 'micropayment API' 'network':64 'no-api-key' 'no-rate-limits' 'offer':48 'openapi':216 'page':233 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call' 'pay-per-request':53 'payment':92,114,119 'per':3,22,55,81,168 'platform':6,25,46,123 'premium':73,200 'premium API access' 'price':146,165 'prompt':240 'proof':120 'proper':212 'protocol':98 'quot':151 'rate':104,149 'report':131 'request':56,169 'requir':107 'respons':222 'retriev':192 'return':210,235 'schema':217 'sentiment':138 'settl':58 'simpli':109 'specif':66,171 'summar':141 'text':140 'titl':199 'token':150 'uniform':164 'unit':86 'usdc':9,28,60,88 'usdc-base' 'util':15,34,156 'utility-services' 'valid':118,158 'via':95 'wallet':239 'web3':145 'wider':122 'x':113 'x-payment':112 'x402':43,97 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"40fe5e97-1c48-4970-9dbb-9d5374be7f73","listingId":"89dfc356-228f-441f-a9f9-8099af6cf624","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.610Z"}],"sources":[{"listingId":"89dfc356-228f-441f-a9f9-8099af6cf624","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.610Z","lastSeenAt":"2026-04-22T02:32:08.750Z"}],"details":{"listingId":"89dfc356-228f-441f-a9f9-8099af6cf624","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/87 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/87"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/87"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium content or messages behind a per-call paywall","Querying data analytics, AI inference, or financial data without signing up for an account","Integrating pay-as-you-go API calls into autonomous agent workflows on Base"],"bestFor":["Agents or developers who want instant, keyless API access with crypto micropayments","Low-volume or sporadic usage where $0.02/request is cheaper than a subscription","Web3-native applications already operating on the Base network"],"notFor":["High-volume consumers who need bulk pricing or subscription discounts","Users who cannot pay in USDC on the Base network","Anyone needing detailed SLAs, uptime guarantees, or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.122Z"},"updatedAt":"2026-04-22T02:32:08.750Z"}}