{"id":"ded8e73e-93f4-4e3d-b8bb-4a32a76312db","shortId":"udPbRJ","kind":"x402","title":"Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.","tagline":"Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.","description":"lowpaymentfee.com offers a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/keys/62` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises 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 listed at the same $0.02/request price point.\n\nHowever, the specific functionality behind `/api/v1/keys/62` (\"Premium API Access\") is not documented beyond its title. There is no OpenAPI schema, no request/response examples, and the crawled docs and pricing pages returned only a wallet-connect prompt with no additional detail. The endpoint is confirmed live — it returns a valid 402 challenge — but what it actually returns upon successful payment is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-access","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No documentation exists for what /api/v1/keys/62 returns upon successful payment","No OpenAPI or output schema provided — request and response formats are unknown","Crawled /api, /pricing, and /README pages all returned only a wallet-connect prompt with no useful content","The generic name 'Premium API Access' does not clarify the endpoint's purpose"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/62","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/keys/62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation explaining what this specific endpoint actually does or returns. The listing is effectively a stub with only a title and 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'/request':12,29,152 '0.02':11,28,72,151 '000':76 '20':75 '402':205 '6':82 'Base network API' 'USDC API' 'access':6,23,67,163 'account':87 'across':108 'actual':210 'addit':194 'advertis':92,106 'ai':118 'analysi':122 'analyt':112 'api':5,22,44,66,85,162 'attach':95 'avail':219 'base':8,25,53,77 'base-network' 'behind':159 'beyond':167 'broader':104 'call':4,21,74 'caller':93 'categori':110 'challeng':206 'classif':125 'collect':38 'confirm':199 'connect':190 'convers':142 'cost':69 'crawl':180 'data':111,115 'decim':83 'detail':195 'doc':181 'document':166 'embed':126 'endpoint':45,59,107,145,197 'estim':136 'exampl':177 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':158 'gas':135 'generat':143 'geocod':140 'header':99 'howev':155 'http-post' 'infrastructur':138 'insight':117 'key':16,33,86 'learn':120 'limit':90 'list':63,147 'live':200 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':119 'materi':220 'metric':113 'micropayment API' 'network':54 'no-api-key' 'offer':36 'openapi':173 'page':184 'pay':2,19,41 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':40 'payment':98,214 'per':3,20,42,73 'platform':105 'point':154 'premium':65,161 'premium API access' 'price':129,153,183 'prompt':191 'protocol':50 'quot':134 'rate':89,132 'report':114 'request':43,102 'request/response':176 'requir':17,34 'return':185,202,211 'schema':174 'sentiment':121 'settl':46 'simpli':94 'specif':58,157 'success':213 'summar':124 'text':123 'titl':169 'token':133 'unit':78 'unknown':216 'upon':212 'usdc':14,31,56,80 'usdc-settlement' 'use':55 'util':139 'valid':141,204 'via':9,26,47 'wallet':189 'wallet-connect':188 'web3':128 'x402':10,27,49,97 'x402 API' 'x402-payment'","prices":[{"id":"37839d76-f2c8-4fba-8125-79e370d865c1","listingId":"ded8e73e-93f4-4e3d-b8bb-4a32a76312db","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/keys/62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.807Z"}],"sources":[{"listingId":"ded8e73e-93f4-4e3d-b8bb-4a32a76312db","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/62","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.807Z","lastSeenAt":"2026-04-22T13:32:27.097Z"}],"details":{"listingId":"ded8e73e-93f4-4e3d-b8bb-4a32a76312db","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/62 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/62"},{"claim":"All endpoints are 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":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/62"}],"useCases":["Agent-driven API consumption with per-call USDC micropayments","Accessing premium data or services without managing API keys or subscriptions","Programmatic pay-as-you-go access from wallets or x402-enabled clients"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before paying","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.148Z"},"updatedAt":"2026-04-22T13:32:27.097Z"}}