{"id":"8a6d88d4-a284-431f-ad83-deb97fc75374","shortId":"yaPVkQ","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 platform that exposes a broad catalog of 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 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/68` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. It accepts HTTP POST requests and returns `application/json`. Payment is made via the x402 exact scheme to the specified payTo address, with a 300-second timeout.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The exact functionality behind the \"Premium API Access\" resource/68 endpoint is unclear from the available material.","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","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","crypto paid api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) are all empty beyond a 'Connect wallet' prompt","No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/generate/resource/68 ('Premium API Access') is undocumented","No request body schema or response schema is provided — callers must guess at the expected input"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/68","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/68","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 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of 'resource/68' specifically is unexplained. Pricing is clear ($0.02 USDC on Base) but everything else must be inferred from the homepage 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'/api/v1/generate/resource/68':119 '/docs':175 '/pricing':176 '/readme':179 '/request':17,34 '0.02':16,33,91,141 '000':135 '20':134 '300':167 '402':129 'accept':145 'access':125,213 'across':50 'address':164 'ai':10,27,60 'ai-inference' 'analysi':64 'analyt':54 'api':4,21,41,106,124,212 'application/json':151 'avail':205,220 'base':7,24,99,136,143 'base network api' 'behind':209 'broad':46 'catalog':47 'categori':52 'challeng':130 'classif':67 'classification' 'commit':114 'connect':185 'content':191 'convers':84 'crypto paid api' 'data':9,26,53,57 'data-analytics' 'document':170,200 'embed':68 'embeddings' 'enabl':40 'endpoint':14,31,49,87,117,215 'estim':78 'exact':158,207 'exampl':204 'exchang':73 'export':58 'expos':44 'extrem':172 'feed':72 'financ':11,28,69 'finance-data' 'four':51 'function':208 'gas':77 'generat':85 'geocod':82 'geocoding' 'http':146 'i.e':140 'infrastructur':80 'insight':59 'json-api' 'key':107 'learn':62 'limit':110 'list':121 'low payment fee' 'lowpaymentfee.com':35 'machin':61 'made':154 'materi':221 'metric':55 'micropayment api' 'network':100 'offer':8,25 'openapi':195 'page':180 'paid':94 'pay per call api' 'pay-per-request' 'payabl':3,20 'payment':152 'payto':163 'per':92 'platform':5,22,42 'post':147 'premium':123,211 'price':71,89 'prompt':187 'protocol':104 'quot':76 'rate':74,109 'render':182 'report':56 'request':93,131,148 'request/response':198 'resource/68':214 'return':127,150 'schema':199 'scheme':159 'second':168 'sentiment':63 'sentiment-analysis' 'spars':173 'spec':196 'specif':116 'specifi':162 'summar':66 'text':65 'text-summarization' 'timeout':169 'token':75 'unclear':217 'unit':137 'upfront':113 'usag':203 'usdc':96,139 'usdc api' 'usdc-base' 'util':13,30,81 'valid':83 'via':101,155 'wallet':186 'web3':70 'x402':2,19,39,103,157 'x402 api' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"67eacb67-5e56-48e5-88bd-93980e889301","listingId":"8a6d88d4-a284-431f-ad83-deb97fc75374","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:12.206Z"}],"sources":[{"listingId":"8a6d88d4-a284-431f-ad83-deb97fc75374","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:12.206Z","lastSeenAt":"2026-04-23T23:02:10.279Z"}],"details":{"listingId":"8a6d88d4-a284-431f-ad83-deb97fc75374","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/68 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint returns 402 challenge requesting maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/68"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/68"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval with per-call USDC micropayments","On-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time finance and crypto market data via x402","Utility operations like geocoding and data conversion with no subscription"],"bestFor":["Developers or agents wanting zero-signup, 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":["Users who need detailed API documentation or guaranteed SLAs","High-throughput production workloads requiring well-documented schemas and error handling","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.648Z"},"updatedAt":"2026-04-23T23:02:10.279Z"}}