{"id":"a9a08198-060d-4e2a-8947-03e259fe58c6","shortId":"CnLsHb","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys needed.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys needed.","description":"This endpoint at lowpaymentfee.com is part of a broader platform offering pay-per-request APIs across data & analytics, AI/ML, finance/Web3, and infrastructure categories. The specific resource `/api/v1/generate/resource/151` is listed as \"Premium API Access\" and is gated via the x402 protocol on the Base network, accepting USDC payments.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD per request. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a timeout of 300 seconds. No API keys or rate limits are advertised — access is purely payment-gated.\n\nThe platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export, all at the same $0.02/request price point. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior, input schema, and response format for this specific resource are unknown. Without documentation or example responses, the precise functionality behind \"Premium API Access\" at resource 151 cannot be confirmed.","tags":[],"capabilities":["x402-payment-gated","per-request-billing","usdc-on-base","no-api-key","post-endpoint","json-response"],"categories":["infrastructure","api-gateway"],"synonyms":["pay-per-request API","x402 API","USDC micropayment API","Base network API","lowpaymentfee","crypto-gated endpoint","premium API"],"warnings":["No documentation available — all doc pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no useful content","The exact functionality of resource 151 ('Premium API Access') is unknown — no input schema or response examples exist","No OpenAPI spec or AI plugin manifest found","The platform lists many endpoints but none have documented behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/151","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/151","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no input/output schema, no example responses, and the actual functionality behind 'Premium API Access' resource 151 is completely opaque. All doc pages returned only 'Connect wallet' with no 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'/api/v1/generate/resource/151':62 '/docs':177 '/pricing':178 '/readme':180 '/request':171 '0.02':10,27,112,170 '000':103 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':121 '151':220 '20':102 '300':128 '6':108 'Base network API' 'USDC micropayment API' 'accept':80,92 'access':6,23,68,138,217 'across':51 'actual':193 'addit':147 'address':120 'advertis':137,146 'ai/ml':54 'amount':97 'analysi':151 'analyt':53 'api':5,22,50,67,131,216 'base':8,25,78,104,123 'behavior':194 'behind':214 'broader':43 'call':100 'cannot':221 'categori':58 'challeng':85 'classif':154 'confirm':86,223 'connect':184 'content':190 'convers':162 'crypto-gated endpoint' 'data':52,164 'decim':109 'document':175,207 'embed':155 'endpoint':36,88,148 'equal':111 'exampl':209 'exchang':158 'export':165 'feed':157 'finance/web3':55 'format':199 'function':213 'gate':3,20,71,143 'geocod':160 'howev':174 'infrastructur':57 'input':195 'json-response' 'key':16,33,132 'limit':135 'list':64 'live':90 'lowpaymentfee' 'lowpaymentfee.com':38 'maximum':96 'need':17,34 'network':79 'no-api-key' 'offer':45 'page':176 'part':40 'pay':9,26,47 'pay-per-request':46 'pay-per-request API' 'payment':82,116,142 'payment-g':141 'per':11,28,48,99,114 'per-request-billing' 'platform':44,145 'point':173 'post':93 'post-endpoint' 'precis':212 'premium':4,21,66,215 'premium API' 'price':156,172 'prompt':186 'protocol':75 'pure':140 'rate':134,159 'request':12,29,49,94,115 'requir':98 'resourc':61,203,219 'respons':198,210 'return':181 'schema':196 'second':129 'sent':118 'sentiment':150 'specif':60,202 'substant':189 'summar':153 'text':152 'timeout':126 'unit':105 'unknown':205 'usd':113 'usdc':14,31,81,107 'usdc-on-base' 'valid':161 'via':72 'wallet':185 'without':206 'x402':2,19,74,84 'x402 API' 'x402-gated':1,18 'x402-payment-gated'","prices":[{"id":"4cb74ba5-d327-44f9-a22f-2e6b69f1f58e","listingId":"a9a08198-060d-4e2a-8947-03e259fe58c6","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/151","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:06.722Z"}],"sources":[{"listingId":"a9a08198-060d-4e2a-8947-03e259fe58c6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/151","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:06.722Z","lastSeenAt":"2026-04-24T10:32:13.147Z"}],"details":{"listingId":"a9a08198-060d-4e2a-8947-03e259fe58c6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/151 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/generate/resource/151","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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/151"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/151"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without managing API keys","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, pay-per-call API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring free or subscription-based access without crypto payments","Production workloads where the endpoint's exact response format must be known in advance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.932Z"},"updatedAt":"2026-04-24T10:32:13.147Z"}}