{"id":"d609ced1-876f-4775-8fed-db4696c13504","shortId":"pFvVQL","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","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 infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no subscriptions — callers simply attach an X-PAYMENT header with a valid x402 payment proof to each request.\n\nThe specific endpoint at `/api/v1/accounts/123` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and has a payment timeout of 300 seconds.\n\nThe broader platform advertises additional endpoints across four categories: 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). All are priced identically at $0.02 per call. Documentation pages exist but appear to require wallet connection and contain no visible technical detail beyond the landing page.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","data-analytics","ai-inference","finance-data","web3-data","geocoding","text-summarization","sentiment-analysis","embeddings"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API access","no-key API","micro-payment endpoint"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only a 'Connect wallet' prompt with no visible technical content.","No OpenAPI or schema documentation is available; request and response formats for this endpoint are unknown.","The purpose of /api/v1/accounts/123 is unclear — 'Premium API Access' is a generic label with no further explanation.","The broader platform lists many endpoints but none have documented input/output schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/123","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/accounts/123","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 well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages behind wallet-connect gates returned no useful content. The specific purpose of /api/v1/accounts/123 ('Premium API Access') is vague and 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'/request':13,32 '0.02':12,31,67,143,208 '000':132 '0x8335':137 '20':131 '2913':138 '300':160 '6':147 'Base network API' 'USDC micropayment API' 'accept':151 'access':120 'across':168 'addit':166 'advertis':127,165 'ai':178 'ai-inference' 'ai/ml':57 'analysi':182 'analyt':56,172 'api':5,17,24,36,45,85,119 'appear':215 'application/json':123 'attach':95 'base':8,27,75,133,140 'beyond':226 'broad':50 'broader':163 'call':4,23,210 'caller':93 'catalog':51 'categori':170 'challeng':126 'classif':185 'connect':219 'contain':221 'convers':201 'cost':66 'crypto API access' 'data':55,60,171,175 'data-analytics' 'decim':148 'detail':225 'document':211 'embed':186 'embeddings' 'enabl':44 'endpoint':53,65,112,150,167 'equal':142 'estim':196 'everi':64 'exchang':191 'exist':213 'export':176 'feed':190 'financ':187 'finance-data' 'finance/web3':59 'four':169 'gas':195 'generat':202 'geocod':199 'geocoding' 'given':144 'header':100 'ident':206 'infer':58 'infrastructur':62,198 'insight':177 'json-response' 'key':18,37,86 'land':228 'learn':180 'limit':89 'list':116 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':179 'maxamountrequir':129 'metric':173 'micro-payment endpoint' 'network':9,28,76 'no-api-key' 'no-key API' 'offer':48 'page':212,229 'paid':70 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':80,99,105,157 'per':3,22,68,209 'platform':6,25,46,164 'post':152 'premium':118 'price':189,205 'proof':106 'protocol':81 'quot':194 'rate':88,192 'report':174 'request':69,109,153 'requir':19,38,217 'return':122 'second':161 'sentiment':181 'sentiment-analysis' 'simpli':94 'span':54 'specif':111 'subscript':92 'summar':184 'technic':224 'text':183 'text-summarization' 'timeout':158 'token':193 'unit':134 'usdc':15,34,72,136,145 'usdc-base-network' 'util':63 'valid':103,200 'via':10,29,77 'visibl':223 'wallet':218 'web3':188 'web3-data' 'x':98 'x-payment':97 'x402':11,30,43,79,104,125 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"73ebaa68-2e25-47b4-b829-3f540d9b5892","listingId":"d609ced1-876f-4775-8fed-db4696c13504","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/accounts/123","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:54.602Z"}],"sources":[{"listingId":"d609ced1-876f-4775-8fed-db4696c13504","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/123","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:54.602Z","lastSeenAt":"2026-04-23T12:30:56.350Z"}],"details":{"listingId":"d609ced1-876f-4775-8fed-db4696c13504","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/123 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/123"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/123"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","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":["Agent-driven data retrieval without managing API keys or subscriptions","On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call","Fetching real-time crypto prices, gas estimates, and exchange rates","Geocoding and data validation as utility microservices"],"bestFor":["AI agents that need frictionless, keyless API access via crypto micropayments","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.765Z"},"updatedAt":"2026-04-23T12:30:56.350Z"}}