{"id":"1da88ae2-8b57-40d5-bb95-05d4f3160c32","shortId":"tQJR2P","kind":"x402","title":"Pay-per-request API platform on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/call.","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 general 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.\n\nThe specific endpoint at `/api/v1/orders/3` is labeled \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model across all listed endpoints.\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, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain unverified. The `/api/v1/orders/3` endpoint itself lacks a documented input/output schema beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","low fee API","Base network API","crypto-paid API","on-demand API"],"warnings":["Documentation pages (/docs, /pricing, /README) returned no useful content — only 'Connect wallet' prompts.","No OpenAPI or schema documentation is available; endpoint behavior must be inferred from landing page descriptions.","The specific endpoint '/api/v1/orders/3' is labeled 'Premium API Access' but its purpose and expected request/response format are undocumented.","The breadth of advertised endpoints (AI, finance, analytics, utilities) is unverified — actual functionality may differ."],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/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/orders/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but documentation pages are empty (only 'Connect wallet' prompts). No OpenAPI spec, no input/output schema, and no example responses are available. The actual functionality behind '/api/v1/orders/3' and the broader endpoint catalog is 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'/call':19,38 '/request':140 '0.02':18,37,124,139 '000':113 '0x8335':118 '20':112 '2913':119 '6':129 'Base network API' 'USDC micropayment API' 'accept':101 'access':99 'across':143 'actual':191 'advertis':107,150 'ai':12,31 'ai-inference' 'ai/ml':57 'analysi':154 'analyt':11,30,56 'api':5,24,45,80,98 'base':8,27,76,114,121 'behavior':192 'beyond':210 'broad':50 'broader':148 'catalog':51 'challeng':106,213 'classif':157 'classification' 'commit':88 'confirm':136 'connect':182 'content':188 'convers':169 'cost':110 'crypto-paid API' 'crypto-quotes' 'data':55,60,171 'data-analytics' 'decim':130 'doc':176 'document':174,207 'embed':158 'embeddings' 'enabl':44 'endpoint':16,35,53,66,92,146,151,198,203 'equal':123 'estim':166 'exchang':161 'feed':160 'financ':13,32 'finance-data' 'finance/web3':59 'flat':138 'gas':165 'general':62 'generat':172 'geocod':167 'geocoding' 'howev':173 'infer':58 'input/output':208 'key':81 'label':96 'lack':205 'land':134 'limit':84 'list':145 'low fee API' 'lowpaymentfee.com':39 'maximum':109 'metadata':214 'minimum':87 'model':142 'network':77 'no-api-key' 'offer':48 'on-demand API' 'page':135,175 'paid':68 'pay':2,21 'pay-per-call API' 'pay-per-request':1,20 'per':3,22,70,125 'per-request':69 'per-request-billing' 'platform':6,25,46,132,149 'post':102 'premium':97 'price':141,159,177 'prompt':184 'quot':164 'rate':83,162 'readm':178 'remain':199 'request':4,23,71,103,126 'requir':89 'respons':194 'return':179 'schema':195,209 'sentiment':153 'sentiment-analysis' 'servic':64 'span':54 'specif':91 'substant':187 'summar':156 'text':155 'text-summarization' 'token':163 'unit':115 'unverifi':200 'usdc':73,117,127 'usdc-base' 'use':72,128 'util':15,34,63 'utility-services' 'valid':168 'via':9,28 'wallet':183 'x402':10,29,43,105,212 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"ac70546f-d946-4ead-bd99-3f9962ae0d3b","listingId":"1da88ae2-8b57-40d5-bb95-05d4f3160c32","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/orders/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":"2026-04-18T18:36:19.108Z"}],"sources":[{"listingId":"1da88ae2-8b57-40d5-bb95-05d4f3160c32","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:19.108Z","lastSeenAt":"2026-04-23T19:00:40.812Z"}],"details":{"listingId":"1da88ae2-8b57-40d5-bb95-05d4f3160c32","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/3 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/orders/3","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Flat pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/orders/3"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/orders/3"},{"claim":"Platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes and gas estimates for DeFi applications","Geocoding and data validation as utility microservices in automated pipelines","Exporting analytics data or generating reports on a per-request basis","Web3-native applications that prefer crypto-settled API billing"],"bestFor":["Developers and agents wanting zero-friction, keyless API access","Crypto-native workflows that can pay in USDC on Base","Low-volume or bursty usage patterns where per-call pricing is economical"],"notFor":["High-volume production workloads where subscription pricing would be cheaper","Users who need detailed SLAs, rate-limit guarantees, or enterprise support","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.199Z"},"updatedAt":"2026-04-23T19:00:40.812Z"}}