{"id":"5355757a-d126-4aae-9d80-eb0e423291d2","shortId":"QjZM6D","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is a multi-category API platform that gates access via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/carts/30` is listed as \"Premium API Access\" and requires a payment of up to 20,000 units of USDC (0x8335…2913 on Base) per call. The broader platform advertises endpoints across four categories: Data & Analytics (metrics, reports, 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). Most listed endpoints are priced at $0.02 per request.\n\nThe platform emphasizes simplicity: no API keys, no rate limits, no minimum commitments, and instant access. Payment is handled entirely through the x402 `X-PAYMENT` header using the \"exact\" scheme on the Base L2 network, settling in USDC. The probe confirms the endpoint is live, returning a well-formed 402 challenge with x402 version 1.\n\nDocumentation is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact purpose and payload format of the `/api/v1/carts/30` endpoint is unclear; the name \"Premium API Access\" is generic and does not describe a specific function.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-gateway","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","base network api","usdc api","micropayment api","402 payment required"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) contain no usable content — only a 'Connect wallet' prompt.","The endpoint path /api/v1/carts/30 does not correspond to any of the advertised API categories on the landing page; its actual function is unknown.","No OpenAPI spec or request/response schema is available; request body format must be guessed.","maxAmountRequired is 20000 USDC units (likely 0.02 USDC given 6 decimals), but this should be verified before sending payments."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/30","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/carts/30","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, but documentation is essentially nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and the endpoint name 'Premium API Access' is generic with no indication of what it actually returns. The carts/30 path does not match any of the advertised API categories, adding 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'/api/v1/carts/30':56,234 '/docs':192 '/pricing':194 '/readme':196 '/request':16,32 '0.02':15,31,127 '000':71 '0x8335':75 '1':186 '20':70 '2913':76 '402':181 '402 payment required' 'access':43,62,145,242 'across':86 'advertis':84 'ai':9,25,95 'ai-inference' 'analysi':99 'analyt':8,24,90 'api':4,20,39,61,135,241 'avail':222 'base':7,23,51,78,163 'base network api' 'broader':82 'call':80 'categori':38,88 'challeng':182 'classif':102 'classification' 'commit':142 'confirm':171 'connect':202 'content':208 'convers':119 'crawl':225 'crypto-quotes' 'data':89 'data-analytics' 'describ':248 'document':187,217 'embed':103 'embeddings' 'emphas':132 'endpoint':13,29,55,85,123,173,235 'entir':149 'estim':113 'exact':159,227 'exampl':221 'exchang':108 'export':93 'extrem':189 'feed':107 'financ':10,26,104 'finance-data' 'form':180 'format':231 'four':87 'function':251 'gas':112 'gate':3,19,42 'generat':120 'generic':244 'geocod':117 'geocoding' 'handl':148 'header':156 'infrastructur':115 'insight':94 'instant':144 'key':136 'l2':164 'learn':97 'limit':139 'list':58,122 'live':175 'low payment fee' 'lowpaymentfee.com':33 'machin':96 'metric':91 'micropayment api' 'minimum':141 'multi':37 'multi-categori':36 'name':239 'network':52,165 'openapi':212 'page':197 'pay per call api' 'pay-per-request' 'payload':230 'payment':47,66,146,155 'per':79,128 'platform':40,83,131 'premium':60,240 'price':106,125 'probe':170 'prompt':204 'protocol':48 'purpos':228 'quot':111 'rate':109,138 'render':199 'report':92 'request':129 'request/response':215 'requir':64 'return':176 'schema':216 'scheme':160 'sentiment':98 'sentiment-analysis' 'settl':166 'simplic':133 'spec':213 'specif':54,250 'substant':207 'suit':5,21 'summar':101 'text':100 'text-summarization' 'thin':190 'token':110 'unclear':237 'unit':72 'usag':220 'usdc':74,168 'usdc api' 'usdc-base' 'use':157 'util':12,28,116 'utility-apis' 'valid':118 'version':185 'via':44 'wallet':203 'web3':105 'well':179 'well-form':178 'x':154 'x-payment':153 'x402':2,18,46,152,184 'x402 api' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"c13c0cac-b293-4b58-a07a-039339cabf44","listingId":"5355757a-d126-4aae-9d80-eb0e423291d2","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/carts/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:12.342Z"}],"sources":[{"listingId":"5355757a-d126-4aae-9d80-eb0e423291d2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:12.342Z","lastSeenAt":"2026-04-23T23:01:54.842Z"}],"details":{"listingId":"5355757a-d126-4aae-9d80-eb0e423291d2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/30 \\\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 with x402Version 1, exact scheme, on Base network, paying in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/carts/30"},{"claim":"The platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform claims no API keys, no rate limits, instant access, Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates via micropayments","Running geocoding or data validation calls on a per-request payment basis","Exporting analytics data or generating insights with no subscription commitment"],"bestFor":["Agents or developers who want keyless, pay-per-use API access","Crypto-native workflows that can settle USDC on Base","Low-volume or bursty usage patterns where subscriptions are wasteful"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users without a Base-compatible wallet or USDC holdings","Anyone requiring detailed API documentation or OpenAPI specs before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.366Z"},"updatedAt":"2026-04-23T23:01:54.842Z"}}