{"id":"71644c87-2082-4d94-b7e7-60bc2df33574","shortId":"YL7n6h","kind":"x402","title":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that exposes a broad set of 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). All endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/generate/resource/26` is listed as \"Premium API Access\" and returns a standard x402 challenge (HTTP 402) with a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02. Payment is made via the `exact` scheme to the specified wallet address on Base. The endpoint accepts HTTP POST requests and returns `application/json` responses.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind the \"Premium API Access\" label for resource/26 is unclear; it may be a generic generation endpoint or a placeholder. Agents should be aware that without documented input schemas, integration requires experimentation or additional discovery.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","json-api"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","402 payment API"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/generate/resource/26 ('Premium API Access') is not documented anywhere","Cannot verify what data or functionality is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/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/generate/resource/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of request/response schemas, no example payloads, and the purpose of 'resource/26' specifically is undefined. All non-landing pages return only a wallet-connect prompt. This is effectively a stub 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'/api/v1/generate/resource/26':118 '/docs':181 '/pricing':182 '/readme':185 '/request':17,34 '0.02':16,33,90,147 '000':138 '20':137 '402':132 '402 payment API' '6':143 'Base network API' 'USDC API' 'accept':164 'access':124,220 'across':50 'actual':214 'addit':196,249 'address':159 'agent':236 'ai':10,27,59 'ai-inference' 'analysi':63 'analyt':54 'api':4,21,41,105,123,219 'application/json':170 'avail':212 'awar':239 'base':7,24,98,139,161 'behind':216 'beyond':173 'broad':46 'categori':52 'challeng':130 'classif':66 'classification' 'commit':113 'connect':191 'convers':83 'data':9,26,53 'data-analytics' 'decim':144 'detail':198 'discoveri':250 'document':172,207,242 'embed':67 'embeddings' 'enabl':40 'endpoint':14,31,49,86,116,163,232 'equal':146 'estim':77 'exact':153 'exampl':210 'exchang':72 'experiment':247 'export':57 'expos':44 'extrem':178 'feed':71 'financ':11,28,68 'finance-data' 'four':51 'function':215 'gas':76 'generat':84,231 'generic':230 'geocod':81 'geocoding' 'http':131,165 'infrastructur':79 'input':243 'insight':58 'integr':245 'json-api' 'key':106 'label':221 'land':175 'learn':61 'limit':109 'list':120 'low payment fee' 'lowpaymentfee.com':35 'machin':60 'made':150 'marketplac':42 'maxamountrequir':135 'may':227 'metric':55 'micropayment API' 'network':99 'offer':8,25 'openapi':202 'page':176,186 'paid':93 'pay-per-call API' 'pay-per-request' 'payabl':3,20 'payload':211 'payment':148 'per':91 'placehold':235 'platform':5,22 'post':166 'premium':122,218 'price':70,88 'prompt':193 'protocol':103 'quot':75 'rate':73,108 'render':188 'report':56 'request':92,167 'request/response':205 'requir':246 'resource/26':223 'respons':171 'return':126,169 'schema':206,244 'scheme':154 'sentiment':62 'sentiment-analysis' 'set':47 'spars':179 'spec':203 'specif':115 'specifi':157 'standard':128 'summar':65 'technic':197 'text':64 'text-summarization' 'token':74 'unclear':225 'unit':140 'upfront':112 'usdc':95,142 'usdc-base' 'util':13,30,80 'valid':82 'via':100,151 'wallet':158,192 'web3':69 'without':241 'x402':2,19,39,102,129 'x402 API' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"7c7e6edb-0fe9-43c3-8641-55f4fda1f528","listingId":"71644c87-2082-4d94-b7e7-60bc2df33574","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/generate/resource/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":"2026-04-18T18:37:30.609Z"}],"sources":[{"listingId":"71644c87-2082-4d94-b7e7-60bc2df33574","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:30.609Z","lastSeenAt":"2026-04-23T16:06:40.805Z"}],"details":{"listingId":"71644c87-2082-4d94-b7e7-60bc2df33574","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/26 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/generate/resource/26","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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/26"},{"claim":"Four API categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, api, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto gas estimates on a per-request payment basis","Running geocoding or data conversion utilities with instant pay-as-you-go pricing","Integrating agent-driven workflows that settle per-call costs in USDC on Base"],"bestFor":["Agents or developers who want zero-signup, pay-per-request API access","Web3-native applications that can settle USDC payments on Base","Prototyping and low-volume usage where subscription plans are overkill"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who cannot transact in USDC on the Base network","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.722Z"},"updatedAt":"2026-04-23T16:06:40.805Z"}}