{"id":"f9789d8b-c54d-4ff5-b250-9b455dba895e","shortId":"B98GAx","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 set of endpoints across 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. The x402 protocol means there are no API keys, no accounts, and no rate limits — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/item/26` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe platform advertises four categories of APIs: 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). However, the specific functionality behind `/api/v1/item/26` is not documented beyond the generic \"Premium API Access\" label, and the docs, pricing, and API pages all appear to be behind a wallet-connect gate with no further content available.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","no-auth API","crypto-paid API"],"warnings":["The specific functionality of /api/v1/item/26 ('Premium API Access') is not documented — it is unclear what data or service this endpoint provides.","No OpenAPI spec, request schema, or response schema is available.","All documentation pages (docs, pricing, API, README) appear to be behind a wallet-connect gate and returned no useful content.","The platform lists many endpoints on its landing page, but none have detailed documentation visible in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/26","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/item/26","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 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and the specific functionality of /api/v1/item/26 is entirely unclear. The docs, pricing, and API pages are all gated behind wallet-connect with no visible 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'/request':13,32 '0.02':12,31,67,139 '000':128 '0x8335':133 '20':127 '2913':134 '300':152 '402':122 '6':143 'Base network API' 'USDC micropayment API' 'accept':157 'access':118,216 'account':87 'across':54 'advertis':165 'ai':177 'ai-inference' 'ai/ml':57 'analysi':181 'analyt':56,171 'api':5,17,24,36,45,84,117,169,215,223 'appear':226 'application/json':162 'attach':94 'avail':239 'base':8,27,75,129,136 'behind':206,229 'beyond':211 'broad':50 'call':4,23 'caller':92 'categori':167 'challeng':123 'classif':184 'connect':233 'content':238 'convers':200 'cost':66 'crypto-paid API' 'data':55,60,170,174 'data-analytics' 'decim':144 'doc':220 'document':210 'embed':185 'enabl':44 'endpoint':53,65,110,156 'equal':138 'estim':195 'everi':64 'exact':149 'exchang':190 'export':175 'feed':189 'financ':186 'finance-data' 'finance/web3':59 'four':166 'function':205 'gas':194 'gate':234 'generat':201 'generic':213 'geocod':198 'given':140 'header':99 'howev':202 'infer':58 'infrastructur':197 'insight':176 'json-response' 'key':18,37,85 'label':217 'learn':179 'limit':91 'list':114 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':178 'mean':80 'metric':172 'network':9,28,76 'no-api-key' 'no-auth API' 'offer':48 'page':224 'paid':70 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':98,103,146 'per':3,22,68 'platform':6,25,46,164 'post':158 'post-method' 'premium':116,214 'price':188,221 'proof':104 'protocol':79 'quot':193 'rate':90,191 'report':173 'request':69,107,124,159 'requir':19,38 'return':120,161 'scheme':147 'second':153 'sentiment':180 'servic':63 'set':51 'simpli':93 'specif':109,204 'summar':183 'text':182 'timeout':154 'token':192 'unit':130 'usdc':15,34,72,132,141 'usdc-base-network' 'util':62 'utility-services' 'valid':102,199 'via':10,29 'wallet':232 'wallet-connect':231 'web3':187 'x':97 'x-payment':96 'x402':11,30,43,78 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e87bc742-ec51-404f-bb79-6b8b30d52b57","listingId":"f9789d8b-c54d-4ff5-b250-9b455dba895e","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/item/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:10.740Z"}],"sources":[{"listingId":"f9789d8b-c54d-4ff5-b250-9b455dba895e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:10.740Z","lastSeenAt":"2026-04-24T09:03:05.986Z"}],"details":{"listingId":"f9789d8b-c54d-4ff5-b250-9b455dba895e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/26 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","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 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02.","source_url":"https://lowpaymentfee.com/api/v1/item/26"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without signup or API keys","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with micropayment-based access control","Using utility services like geocoding, validation, and conversion without rate limits"],"bestFor":["Agents and bots that need instant, 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":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume production workloads where per-request crypto payments add latency or cost overhead","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.71Z"},"updatedAt":"2026-04-24T09:03:05.986Z"}}