{"id":"85b85be5-38d0-4fb7-83b0-d3ebfc1967b1","shortId":"S6BM9s","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. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 payment challenge is returned as a standard 402 response, and callers settle directly on-chain.\n\nThe specific endpoint at `/api/v1/transactions/221` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call — consistent with the site's advertised flat pricing. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. However, documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints are undocumented in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) returned no useful content — only 'Connect wallet' prompts","No OpenAPI or schema available; request and response formats for this endpoint are unknown","The specific endpoint /api/v1/transactions/221 is labeled 'Premium API Access' but its actual function is undocumented","The broader catalog lists many endpoint categories (AI, finance, utils) but none have documented schemas or example responses"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/221","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/221","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 challenge with clear pricing. However, documentation pages are empty (all show only 'Connect wallet'), there is no OpenAPI spec, no request/response schema, and the specific purpose of /api/v1/transactions/221 ('Premium API Access') is unexplained. The platform lists many endpoints but provides no details on inputs, outputs, or actual 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'/api/v1/transactions/221':102 '/docs':182 '/pricing':183 '/readme':185 '/request':13,28 '0.02':12,27,59,134 '000':118 '0x8335':123 '20':117 '2913':124 '402':89,112 '6':130 'accept':147 'access':108 'actual':199 'advertis':142,156 'ai-inference' 'ai/ml':49 'analysi':160 'analyt':48 'api':5,20,37,71,107 'application/json':152 'base':8,23,67,119,126 'base network api' 'behavior':200 'broad':42 'broader':154 'call':4,19,136 'caller':92 'catalog':43 'chain':97 'challeng':83,113 'classif':163 'classification' 'commit':79 'connect':190 'consist':137 'content':196 'convers':175 'cost':58 'crawl':211 'crypto-data' 'data':47,52,177 'data-analytics' 'decim':131 'direct':94 'document':180 'embed':164 'embeddings' 'enabl':36 'endpoint':45,57,100,146,157,206 'equal':133 'estim':172 'everi':56 'exchang':167 'feed':166 'finance-data' 'finance/web3':51 'flat':143 'gas':171 'generat':178 'geocod':173 'geocoding' 'howev':179 'infer':50 'key':72 'limit':75 'list':104 'low payment fee' 'lowpaymentfee.com':31 'materi':212 'micropayment api' 'network':9,24,68 'no-auth api' 'offer':40 'on-chain':95 'page':181 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':82 'per':3,18,60,135 'platform':6,21,38,155 'post':148 'premium':106 'price':144,165 'prompt':192 'quot':170 'rate':74,168 'request':61,114,149 'respons':90,202 'return':85,110,151,187 'schema':203 'sentiment':159 'sentiment-analysis' 'servic':55 'settl':93 'sinc':127 'site':140 'span':46 'specif':99 'standard':88 'substant':195 'summar':162 'text':161 'text-summarization' 'token':169 'undocu':208 'unit':120 'upfront':78 'usdc':15,30,64,122,128 'usdc api' 'usdc-base-network' 'use':129 'util':54 'utility-services' 'valid':174 'via':10,25 'wallet':191 'x402':11,26,35,81 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"46f8fc8b-dd61-488e-989c-bb67891ef8d6","listingId":"85b85be5-38d0-4fb7-83b0-d3ebfc1967b1","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/221","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:16.890Z"}],"sources":[{"listingId":"85b85be5-38d0-4fb7-83b0-d3ebfc1967b1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/221","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:16.890Z","lastSeenAt":"2026-04-22T21:31:37.824Z"}],"details":{"listingId":"85b85be5-38d0-4fb7-83b0-d3ebfc1967b1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/221 \\\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 up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/221"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/221"},{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call payment","Geocoding or data validation as a utility microservice settled in USDC on Base"],"bestFor":["AI agents with Base USDC wallets needing frictionless API access","Developers who want pay-per-use without subscriptions or API keys","Web3-native applications that prefer on-chain settlement for API calls"],"notFor":["High-volume batch workloads where $0.02/request adds up quickly","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.626Z"},"updatedAt":"2026-04-22T21:31:37.824Z"}}