{"id":"6027d6d2-971b-4e03-b95a-46abe1051687","shortId":"tFmZFJ","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 set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required. The specific endpoint at `/api/v1/transactions/3` is labeled \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals).\n\nThe platform advertises four categories of APIs: 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 are listed at the same $0.02 price point. Payment is handled via the x402 protocol's exact scheme, settling on the Base L2 network.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The actual functionality behind the \"Premium API Access\" label at `/api/v1/transactions/3` is unclear, as it does not correspond to any of the named API categories on the landing page.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","no-api-key"],"categories":["api-platform","ai","finance","data"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","Base network API","low fee API","crypto-paid API","serverless API marketplace"],"warnings":["No OpenAPI schema or detailed documentation available for any endpoint","The /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no content","The endpoint path /api/v1/transactions/3 ('Premium API Access') does not match any of the named APIs on the landing page — its actual functionality is unknown","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/3","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no meaningful documentation beyond the landing page listing. The specific endpoint path '/api/v1/transactions/3' is not described anywhere on the site. Effectively a stub 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'/api/v1/transactions/3':85,230 '/docs':188 '/pricing':190 '/readme':192 '/request':13,28 '0.02':12,27,111,164 '000':100 '0x8335':105 '20':99 '2913':106 '6':116 'Base network API' 'USDC micropayment API' 'access':90,227 'actual':221 'advertis':120 'ai':132 'ai-inference' 'ai/ml':49 'analysi':136 'analyt':48,126 'api':5,20,37,71,89,124,226,243 'base':8,23,67,101,108,180 'behind':223 'broad':42 'call':4,19,113 'categori':122,244 'challeng':95 'classif':139 'classification' 'commit':79 'connect':198 'content':204 'convers':156 'correspond':237 'crypto-paid API' 'crypto-quotes' 'data':47,52,125,129 'data-analytics' 'decim':117 'detail':215 'document':183,216 'embed':140 'embeddings' 'enabl':36 'endpoint':45,57,83,219 'equal':110 'estim':150 'exact':175 'exampl':212 'exchang':145 'export':130 'extrem':185 'feed':144 'financ':141 'finance-data' 'finance/web3':51 'four':121 'function':222 'gas':149 'generat':157 'geocod':154 'geocoding' 'handl':169 'infer':50 'infrastructur':152 'insight':131 'key':72 'l2':181 'label':87,228 'land':247 'learn':134 'limit':75 'list':160 'low fee API' 'lowpaymentfee.com':31 'machin':133 'metric':127 'minimum':78 'name':242 'network':9,24,68,182 'no-api-key' 'offer':40 'openapi':208 'page':193,248 'paid':59 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'payment':167 'per':3,18,61,112 'per-request':60 'per-request-billing' 'platform':6,21,38,119 'point':166 'premium':88,225 'price':143,165 'prompt':200 'protocol':173 'quot':148 'rate':74,146 'render':195 'report':128 'request':62,96 'request/response':211 'requir':80 'return':92 'schema':209 'scheme':176 'sentiment':135 'sentiment-analysis' 'serverless API marketplace' 'servic':55 'set':43 'settl':177 'span':46 'spars':186 'specif':82 'summar':138 'text':137 'text-summarization' 'token':147 'unclear':232 'unit':102 'usdc':15,30,64,104,114 'usdc-base-network' 'use':63,115 'util':54,153 'valid':155 'via':10,25,170 'wallet':199 'web3':142 'x402':11,26,35,94,172 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"05604849-e63b-4372-8e57-b887ec86d031","listingId":"6027d6d2-971b-4e03-b95a-46abe1051687","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:55.562Z"}],"sources":[{"listingId":"6027d6d2-971b-4e03-b95a-46abe1051687","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:55.562Z","lastSeenAt":"2026-04-22T11:32:23.108Z"}],"details":{"listingId":"6027d6d2-971b-4e03-b95a-46abe1051687","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/3 \\\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 the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/transactions/3 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/3"},{"claim":"The platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto price feeds and gas estimates with per-call USDC payments","Running geocoding or data validation utilities with no subscription commitment","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["Developers or agents wanting zero-friction, keyless API access paid in USDC","Low-volume or bursty workloads where per-request pricing avoids subscription waste","Web3-native applications that prefer on-chain settlement for API calls"],"notFor":["High-volume production workloads needing SLAs, rate-limit guarantees, or detailed documentation","Users without access to USDC on the Base network","Applications requiring well-documented, schema-validated API contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.429Z"},"updatedAt":"2026-04-22T11:32:23.108Z"}}