{"id":"f5174e13-d346-4787-bf7c-e25c6462e314","shortId":"J6cFfr","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a broad set 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 protocol — no API keys, no rate limits, no subscriptions.\n\nThe specific endpoint at `/api/v1/invoices/32` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages exist but appear to require wallet connection to view, so detailed request/response schemas for individual endpoints are not available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","data analytics API","AI inference API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all appear gated behind wallet connection and returned no useful content.","The specific endpoint /api/v1/invoices/32 has a generic description ('Premium API Access') with no schema or documentation explaining what it actually does.","No OpenAPI spec or request/response schema is available for any endpoint.","The platform lists many endpoints on its landing page but none have documented input/output contracts in the crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/32","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/invoices/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and documentation pages behind the wallet gate yielded no content. The specific purpose of `/api/v1/invoices/32` (\"Premium API Access\") is vague — it's unclear what data or service it actually 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'/request':19,38 '0.02':18,37,67,114,173 '000':109 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':129 '20':108 '300':132 '402':103 '6':119 'AI inference API' 'Base network API' 'USDC API' 'accept':137 'access':99 'addit':147 'address':128 'advertis':146 'ai':12,31 'ai-inference' 'ai/ml':57 'analysi':151 'analyt':56 'api':5,24,45,82,98 'appear':180 'application/json':142 'avail':196 'base':8,27,75,110,122 'broad':50 'broader':144 'call':4,23 'challeng':104 'classif':154 'classification' 'connect':184 'convers':166 'cost':66 'cover':10,29 'crawl':199 'crypto-data' 'data':11,30,55,60 'data analytics API' 'data-analytics' 'decim':120 'detail':188 'document':176 'embed':155 'embeddings' 'enabl':44 'endpoint':16,35,53,65,91,136,148,193 'estim':163 'everi':64 'exchang':158 'exist':178 'feed':157 'financ':13,32 'finance-data' 'finance/web3':59 'gas':162 'generat':168 'geocod':164 'geocoding' 'includ':149 'individu':192 'infer':58 'infrastructur':62 'key':83 'limit':86 'list':95 'low payment fee' 'lowpaymentfee.com':39 'marketplac':46 'micropayment API' 'network':76 'offer':48 'page':177 'paid':70 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':124 'per':3,22,68 'platform':6,25,145 'point':175 'post':138 'premium':97 'price':156,174 'protocol':80 'quot':161 'rate':85,159 'request':69,105,139 'request/response':189 'requir':182 'return':101,141 'schema':190 'second':133 'sentiment':150 'sentiment-analysis' 'set':51 'settl':126 'sinc':116 'span':54 'specif':90 'subscript':88 'summar':153 'text':152 'text-summarization' 'timeout':134 'token':160 'unit':111 'usd':115 'usdc':9,28,72,113,117 'usdc-base' 'use':118 'util':15,34,63 'utility-services' 'valid':165 'via':77 'view':186 'wallet':183 'x402':43,79 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"32071a63-e233-4922-a820-f08036e59144","listingId":"f5174e13-d346-4787-bf7c-e25c6462e314","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/invoices/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:38.473Z"}],"sources":[{"listingId":"f5174e13-d346-4787-bf7c-e25c6462e314","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:38.473Z","lastSeenAt":"2026-04-23T15:00:45.537Z"}],"details":{"listingId":"f5174e13-d346-4787-bf7c-e25c6462e314","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/32 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/invoices/32"},{"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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/invoices/32"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call billing","Geocoding or data validation as a utility service paid per request via x402","Exporting data or generating analytics reports with no subscription commitment"],"bestFor":["AI agents needing keyless, pay-per-call access to diverse API endpoints","Developers who want to avoid API key management and subscription overhead","Low-volume or bursty workloads where $0.02/request flat pricing is economical"],"notFor":["High-volume production workloads where per-request costs would accumulate significantly","Users who need detailed SLAs, guaranteed uptime, or enterprise support","Anyone without access to USDC on the Base network for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.23Z"},"updatedAt":"2026-04-23T15:00:45.537Z"}}