{"id":"9bd91ba8-c661-43b4-a5cf-2e0200905dbe","shortId":"PHNHgm","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, 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 & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/31` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns `application/json`. The broader platform also exposes endpoints for 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.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (402 challenge captured), but the actual behavior and response format of `/api/v1/messages/31` specifically is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee API","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected request/response format of /api/v1/messages/31 is undocumented","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no technical content","The platform lists many endpoints but none have detailed docs; actual functionality is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/31","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/31","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 pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no usage examples, and no documentation beyond a landing page listing. The purpose of '/api/v1/messages/31' specifically is opaque — 'Premium API Access' is a generic label. This is effectively a stub 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'/api/v1/messages/31':102,234 '/pricing':185 '/readme':187 '/request':18,36 '0.02':17,35,68,129,173 '000':118 '0x8335':123 '20':117 '2913':124 '402':223 '6':133 'Base network API' 'USDC API' 'accept':137 'access':108 'actual':228 'advertis':112 'ai':12,30,55 'ai-inference' 'also':146 'amount':115 'analysi':151 'analyt':54 'api':5,23,43,79,107 'application/json':142 'attach':90 'avail':214 'base':8,26,76,119,126 'behavior':229 'beyond':177 'broad':48 'broader':144 'call':4,22 'caller':88 'captur':225 'challeng':111,224 'classif':154 'classification' 'collect':49 'commit':85 'confirm':221 'connect':193 'convers':166 'cover':10,28 'crawl':217 'crypto-quotes' 'data':11,29,53 'data-analytics' 'decim':134 'detail':200 'document':176,209 'embed':155 'embeddings' 'enabl':42 'endpoint':51,64,100,136,148,219 'equal':128 'estim':163 'everi':63 'exampl':213 'exchang':158 'expos':147 'feed':157 'financ':13,31,58 'finance-data' 'format':232 'gas':162 'gas-estimates' 'generat':168 'geocod':164 'geocoding' 'given':130 'header':94 'infrastructur':61 'key':80 'land':179 'learn':57 'limit':82 'list':104 'live':222 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'maximum':114 'micropayment API' 'network':77 'offer':46 'openapi':204 'page':180,188 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':93 'per':3,21,69 'platform':44,145 'point':175 'post':138 'premium':106 'price':66,156,174 'prompt':195 'quot':161 'rate':81,159 'request':70,97,139 'request/response':207 'requir':87 'resolv':190 'respons':231 'return':141 'schema':208 'sentiment':150 'sentiment-analysis' 'settl':71 'simpli':89 'span':52 'spars':182 'spec':205 'specif':99,235 'suit':6,24 'summar':153 'technic':199 'text':152 'text-summarization' 'token':160 'unit':120 'unknown':237 'upfront':84 'usag':212 'usdc':9,27,73,122,131 'usdc-base' 'util':15,33,62 'utility-apis' 'valid':165 'wallet':194 'web3':59 'x402':41,92,110 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"0353f389-90ea-4650-8b5f-dd9ce99e4dd2","listingId":"9bd91ba8-c661-43b4-a5cf-2e0200905dbe","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.750Z"}],"sources":[{"listingId":"9bd91ba8-c661-43b4-a5cf-2e0200905dbe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.750Z","lastSeenAt":"2026-04-22T02:32:07.702Z"}],"details":{"listingId":"9bd91ba8-c661-43b4-a5cf-2e0200905dbe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/31 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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/31"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/31"},{"claim":"All endpoints are 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 platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","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","Integrating pay-as-you-go analytics and data export into agent workflows"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Low-volume or bursty workloads where subscription pricing is wasteful","Crypto-native applications already operating on the Base network"],"notFor":["High-volume production workloads where per-request costs add up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Developers without access to USDC on Base for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.536Z"},"updatedAt":"2026-04-22T02:32:07.702Z"}}