{"id":"e6127506-8acf-4d4c-9619-cc151ce60506","shortId":"4PsTYW","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"This endpoint at lowpaymentfee.com is part of a broader suite of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific resource `/api/v1/generate/resource/163` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. It accepts POST requests and returns application/json responses.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The maximum amount required per call is 20,000 base units of USDC, which at 6 decimals equals $0.02 USD. There are no API keys, no rate limits, and no subscription commitments — each request is individually settled on-chain. The payment timeout is 300 seconds.\n\nThe provider's landing page advertises a wide catalog of endpoints across categories like sentiment analysis, text summarization, embeddings, price feeds, geocoding, and more — all at the same $0.02/request price point. However, documentation pages (docs, pricing, README) all resolve to a minimal \"Connect wallet\" prompt with no further technical detail. Without documentation or example payloads, the actual input/output schema for this specific resource is unknown.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API access","Base network API","lowpaymentfee","premium API","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no technical content","The exact functionality of resource/163 is unknown; 'Premium API Access' is the only description provided","No input or output schema is documented; callers must guess at the request body format","The provider hosts many endpoints but none appear to have public documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/163","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/163","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, confirming it accepts payments. However, there is zero documentation on what this specific resource does, what inputs it expects, or what outputs it returns. The docs, pricing, and README pages all render only a 'Connect wallet' prompt with no content. The listing title 'Premium API Access' is generic and 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'/request':186 '0.02':10,29,129,185 '000':119 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':110 '20':118 '300':155 '6':126 'Base network API' 'USDC API access' 'accept':89 'access':6,25,77 'across':168 'actual':214 'advertis':162 'ai/ml':61 'amount':113 'analysi':172 'analyt':60 'api':5,24,57,76,134 'application/json':94 'base':8,27,105,120 'base-network' 'beyond':85 'broader':47 'call':56,116 'catalog':165 'categori':169 'chain':150 'commit':142 'connect':200 'contract':109 'crypto-paid API' 'data':59,64 'decim':127 'detail':207 'doc':192 'document':84,190,209 'embed':175 'endpoint':40,167 'equal':128 'exact':80 'exampl':211 'feed':177 'finance/web3':63 'function':81 'gate':3,22 'geocod':178 'handl':98 'howev':189 'individu':146 'infer':62 'infrastructur':66 'input/output':215 'json-api' 'key':16,35,135 'label':87 'land':160 'like':170 'limit':19,38,138 'list':73 'lowpaymentfee' 'lowpaymentfee.com':42 'maximum':112 'micropayment API' 'minim':199 'network':106 'no-api-key' 'no-rate-limit' 'on-chain':148 'page':161,191 'part':44 'pay':9,28,54 'pay-per-cal':53 'pay-per-call API' 'payload':212 'payment':96,152 'per':11,30,55,115 'per-request-billing' 'point':188 'post':90 'post-method' 'premium':4,23,75 'premium API' 'price':176,187,193 'prompt':202 'protocol':52,102 'provid':158 'rate':18,37,137 'readm':194 'request':12,31,91,144 'requir':114 'resolv':196 'resourc':70,220 'respons':95 'return':93 'schema':216 'second':156 'sentiment':171 'settl':147 'span':58 'specif':69,219 'subscript':141 'suit':48 'summar':174 'technic':206 'text':173 'timeout':153 'unit':121 'unknown':222 'usd':130 'usdc':14,33,108,123 'usdc-settlement' 'use':107 'util':67 'via':99 'wallet':201 'wide':164 'without':208 'x402':2,21,51,101 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':50","prices":[{"id":"d7a57e8d-f569-4154-a8c8-49cf0ac5e649","listingId":"e6127506-8acf-4d4c-9619-cc151ce60506","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/163","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:27.588Z"}],"sources":[{"listingId":"e6127506-8acf-4d4c-9619-cc151ce60506","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/163","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:27.588Z","lastSeenAt":"2026-04-24T11:31:46.188Z"}],"details":{"listingId":"e6127506-8acf-4d4c-9619-cc151ce60506","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/163 \\\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":"Endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/163"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/163"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/163"},{"claim":"Documentation pages resolve to minimal 'Connect wallet' content only","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand API access without pre-registration or API key management","Pay-per-call workflows where usage is sporadic and subscriptions are wasteful","Programmatic access to premium resources settled in USDC on Base"],"bestFor":["AI agents with x402-compatible payment capabilities","Developers wanting zero-signup, pay-as-you-go API access","Low-volume or bursty workloads where per-request pricing is economical"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up significantly","Anyone without a Base-network USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.869Z"},"updatedAt":"2026-04-24T11:31:46.188Z"}}