{"id":"bf6fbdea-cf9f-40e0-bfdd-7d02d0794413","shortId":"GPJZhn","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/342` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises categories including: 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 (geocoding, validation, conversion, generation). However, documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no actual API docs, schemas, or example payloads. The exact functionality of the `/api/v1/transactions/342` endpoint specifically is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","json-api"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","serverless api","no-auth api"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no content","The specific functionality of /api/v1/transactions/342 is undocumented; 'Premium API Access' is a generic label","No OpenAPI spec, request schema, or response schema available","No example requests or responses found anywhere in crawled materials","The broad catalog of endpoints (AI, finance, analytics, etc.) is advertised but unverifiable without documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/342","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/transactions/342","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and all documentation pages beyond the landing page are empty ('Connect wallet' only). The specific purpose of /api/v1/transactions/342 is unclear — 'Premium API Access' is a generic label. The platform lists many endpoint categories but provides no concrete documentation for any of 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'/request':13,28 '0.02':12,27,64,123 '000':112 '0x8335':117 '20':111 '2913':118 '300':136 '402':106 '6':127 'accept':141 'access':102 'account':76 'actual':200 'advertis':150 'ai':160 'ai-inference' 'ai/ml':49 'analysi':164 'analyt':48,154 'api':5,20,37,74,101,201 'application/json':146 'attach':84 'avail':218 'base':8,23,71,113,120 'base network api' 'base-network' 'beyond':188 'broad':42 'broader':148 'call':4,19 'caller':82 'catalog':43 'categori':151 'challeng':107 'classif':167 'classification' 'connect':195 'convers':183 'data':47,52,153,157 'data-analytics' 'decim':128 'doc':202 'document':186 'embed':168 'embeddings' 'enabl':36 'endpoint':45,57,94,140,213 'equal':122 'estim':178 'exact':133,208 'exampl':205 'exchang':173 'export':158 'feed':172 'financ':169 'finance-data' 'finance/web3':51 'function':209 'gas':177 'generat':184 'geocod':181 'geocoding' 'given':124 'header':88 'howev':185 'includ':152 'infer':50 'infrastructur':180 'insight':159 'json-api' 'key':75 'land':190 'learn':162 'limit':79 'list':98 'low payment fee' 'lowpaymentfee.com':31 'machin':161 'materi':219 'metric':155 'micropayment api' 'network':9,24,72 'no-api-key' 'no-auth api' 'offer':40 'page':187,191 'pay':2,17,60 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':59 'payload':206 'payment':87,130 'per':3,18,61 'platform':6,21,38,149 'post':142 'premium':100 'price':171 'prompt':197 'quot':176 'rate':78,174 'report':156 'request':62,91,108,143 'requir':81 'return':104,145,192 'schema':203 'scheme':131 'second':137 'sentiment':163 'sentiment-analysis' 'serverless api' 'servic':55 'settl':66 'simpli':83 'span':46 'specif':93,214 'summar':166 'text':165 'text-summarization' 'timeout':138 'token':175 'unclear':216 'unit':114 'usdc':15,30,68,116,125 'usdc api' 'usdc-settlement' 'util':54 'valid':182 'via':10,25 'wallet':196 'web3':170 'x402':11,26,35,86 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"55704a45-10d2-4ec6-9a63-74b632f697c2","listingId":"bf6fbdea-cf9f-40e0-bfdd-7d02d0794413","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/transactions/342","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:22.277Z"}],"sources":[{"listingId":"bf6fbdea-cf9f-40e0-bfdd-7d02d0794413","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/342","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:22.277Z","lastSeenAt":"2026-04-22T18:32:35.098Z"}],"details":{"listingId":"bf6fbdea-cf9f-40e0-bfdd-7d02d0794413","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/342 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/342"},{"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":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/342"}],"useCases":["Agent-driven API consumption without pre-registration or API keys","Pay-per-call access to AI inference endpoints (sentiment, summarization, classification, embeddings)","On-demand financial data retrieval (prices, exchange rates, gas estimates)","Utility operations like geocoding, validation, and data conversion"],"bestFor":["AI agents needing frictionless, keyless API access via x402","Developers who want pay-as-you-go pricing with no commitments","Crypto-native applications that can settle in USDC on Base"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.12Z"},"updatedAt":"2026-04-22T18:32:35.098Z"}}