{"id":"e898ac24-58d1-44b8-81c8-cfb31921eb07","shortId":"EgVrtZ","kind":"x402","title":"x402-gated premium API access on Base, paying $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/apikeys/74` is one of many API endpoints offered by the platform, which spans categories including 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).\n\nAll endpoints on the platform are priced at $0.02 per request, settled in USDC (USD Coin) on the Base L2 network. The x402 challenge confirms the asset is USDC at contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, with a maxAmountRequired of 20000 base units (i.e., $0.02 given USDC's 6 decimals). The platform advertises no API keys, no rate limits, and instant access — payment is handled entirely through the x402 X-PAYMENT header.\n\nHowever, the specific functionality behind the `/api/v1/apikeys/74` path is unclear. The endpoint name \"Premium API Access\" and the path segment \"apikeys\" suggest it may be related to API key generation or management rather than a data-serving endpoint. Documentation pages (/docs, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","no-api-key-required","pay-per-use"],"categories":["infrastructure","api-access"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — all doc pages (/docs, /pricing, /README) return only a 'Connect wallet' prompt with no substantive content.","The specific functionality of /api/v1/apikeys/74 is unclear; the path suggests API key management but no schema or description is provided.","No OpenAPI spec, no input/output schema beyond the basic x402 outputSchema stub.","Cannot verify what data or service is actually returned after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/74","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/apikeys/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no request/response schema, and the actual functionality of this specific endpoint (/api/v1/apikeys/74) is ambiguous. All doc pages returned only 'Connect wallet' with no 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'/docs':208 '/pricing':209 '/readme':210 '0.02':10,24,105,138 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':129 '20000':134 '6':142 'Base network API' 'USDC micropayment API' 'access':6,20,36,155,182 'actual':224 'address':128 'advertis':146 'ai':71 'analysi':75 'analyt':65 'api':5,19,35,54,148,181,194 'apikey':187 'asset':123 'base':8,22,44,115,135 'base-network' 'behind':171 'categori':62 'challeng':120 'classif':78 'coin':112 'confirm':121 'connect':215 'content':221 'contract':127 'convers':95 'crypto-paid API' 'data':64,68,203 'data-serv':202 'decim':143 'document':206 'embed':79 'endpoint':30,48,55,98,178,205,229 'entir':159 'estim':89 'exchang':84 'export':69 'feed':83 'financ':80 'function':170 'gas':88 'gate':3,17 'generat':96,196 'geocod':93 'given':139 'handl':158 'header':166 'howev':167 'i.e':137 'includ':63 'infrastructur':91 'insight':70 'instant':154 'key':149,195 'l2':116 'learn':73 'limit':152 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':72 'manag':198 'mani':53 'maxamountrequir':132 'may':190 'metric':66 'name':179 'network':45,117 'no-api-key-required' 'offer':56 'one':51 'page':207 'path':174,185 'pay':9,23 'pay-per-call API' 'pay-per-use' 'payment':40,156,165 'per':11,25,106 'per-request-pricing' 'platform':59,101,145 'premium':4,18,34,180 'premium API access' 'price':82,103 'prompt':217 'protocol':41 'provid':33 'quot':87 'rate':85,151 'rather':199 'relat':192 'report':67 'request':12,26,107 'request/response':225 'return':212 'schema':226 'segment':186 'sentiment':74 'serv':204 'settl':108 'span':61 'specif':47,169 'substant':220 'suggest':188 'summar':77 'text':76 'token':86 'unclear':176 'unit':136 'unknown':231 'usd':111 'usdc':14,28,110,125,140 'usdc-settlement' 'util':92 'valid':94 'via':37 'wallet':216 'web3':81 'x':164 'x-payment':163 'x402':2,16,39,119,162 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"14c68d6e-be29-44bc-8766-b6197978b8ec","listingId":"e898ac24-58d1-44b8-81c8-cfb31921eb07","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/apikeys/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:35.565Z"}],"sources":[{"listingId":"e898ac24-58d1-44b8-81c8-cfb31921eb07","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:35.565Z","lastSeenAt":"2026-04-23T06:31:46.098Z"}],"details":{"listingId":"e898ac24-58d1-44b8-81c8-cfb31921eb07","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/74 \\\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":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms USDC asset at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with maxAmountRequired of 20000 base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/74"}],"useCases":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need on-demand API access settled in USDC","Accessing data, AI, finance, or utility endpoints with per-request crypto payments"],"bestFor":["Developers or agents who want keyless, pay-per-request API access","Use cases requiring low-friction micropayments on Base L2","Scenarios where traditional subscription billing is undesirable"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume use cases where per-request pricing at $0.02 may be expensive compared to bulk plans","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.871Z"},"updatedAt":"2026-04-23T06:31:46.098Z"}}