{"id":"ba7b3dd1-df7b-4503-8c40-a992b05bc410","shortId":"DQS54v","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad collection of endpoints across four categories: Data & Analytics (metrics, reports, 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 priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/messages/24` is listed as \"Premium API Access\" and its 402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02. Payment is made per-request with no API keys, no rate limits, and no minimum commitments required. The x402 challenge uses the \"exact\" scheme with a 300-second timeout.\n\nDocumentation is extremely sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The purpose of the `/api/v1/messages/24` endpoint specifically is unclear; it may be a messaging or content retrieval endpoint, but this is not confirmed by any available documentation.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","serverless api","no-auth api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/messages/24 ('Premium API Access') is undocumented and unclear","All non-root pages (/api, /pricing, /README) returned only a wallet-connect prompt with no useful content","No request or response examples are available; integration requires trial-and-error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/24","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation for the specific /messages/24 endpoint, and the crawled pages beyond the landing page are empty wallet-connect prompts. The purpose of this specific endpoint is 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'/api/v1/messages/24':111,212 '/pricing':174 '/readme':176 '/request':19,38 '0.02':18,37,94,137 '000':127 '0x8335':132 '20':126 '300':165 '402':120 'access':117 'across':54 'addit':188 'advertis':122 'ai':12,31,63 'ai-inference' 'analysi':67 'analyt':58 'api':5,24,45,116,146 'avail':203,233 'base':8,27,102,128,134 'base network api' 'broad':50 'call':4,23 'categori':56 'challeng':121,158 'classif':70 'collect':51 'commit':154 'confirm':230 'connect':184 'content':189,223 'convers':87 'crawl':206 'crypto-quotes' 'data':11,30,57 'data-analytics' 'document':168,198,234 'embed':71 'embeddings' 'enabl':44 'endpoint':16,35,53,90,110,213,225 'equal':136 'estim':81 'exact':161 'exampl':202 'exchang':76 'export':61 'expos':48 'extrem':170 'feed':75 'financ':13,32,72 'finance-data' 'four':55 'gas':80 'generat':88 'geocod':85 'geocoding' 'infrastructur':83 'insight':62 'key':147 'learn':65 'limit':150 'list':113 'low payment fee' 'lowpaymentfee.com':39 'machin':64 'made':140 'materi':207 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'x402-payment'","prices":[{"id":"330c932f-d824-48a2-a8ff-d6b7ac28dc1b","listingId":"ba7b3dd1-df7b-4503-8c40-a992b05bc410","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.785Z"}],"sources":[{"listingId":"ba7b3dd1-df7b-4503-8c40-a992b05bc410","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.785Z","lastSeenAt":"2026-04-22T02:32:07.769Z"}],"details":{"listingId":"ba7b3dd1-df7b-4503-8c40-a992b05bc410","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/24 \\\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":"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 402 challenge for /api/v1/messages/24 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/24"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","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-request payment basis","Accessing utility services like geocoding, validation, and data conversion with minimal friction","Agents autonomously purchasing API calls using x402 USDC payments on Base"],"bestFor":["AI agents that need frictionless, keyless API access via crypto micropayments","Developers prototyping with low-cost, no-commitment API endpoints","Web3-native applications that prefer on-chain payment settlement"],"notFor":["Production workloads requiring detailed SLAs, rate-limit guarantees, or documented error handling","Users who need comprehensive API documentation and request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.53Z"},"updatedAt":"2026-04-22T02:32:07.769Z"}}