{"id":"ec4e1148-a432-4440-bc98-3612098699e9","shortId":"xcfAMF","kind":"x402","title":"Premium API access via x402 micropayment on Base network — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base network — $0.02 per request in USDC.","description":"lowpaymentfee.com offers a suite of pay-per-call API endpoints gated by the x402 protocol on the Base network. This specific endpoint (`/api/v1/apikeys/1`) is labeled \"Premium API Access\" and accepts USDC payments at a maximum cost of $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 and settle on the Base L2 network using USDC (contract 0x8335…2913).\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The exact functionality of the `/api/v1/apikeys/1` endpoint beyond its name is unclear.","tags":[],"capabilities":["x402-payment-gated","usdc-settlement","base-network","pay-per-request","no-api-key-required","no-rate-limits"],"categories":["infrastructure","api-access"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API access","Base network API","lowpaymentfee"],"warnings":["No OpenAPI spec or request/response schema available","Documentation pages render only 'Connect wallet' with no technical content","The exact purpose and output of /api/v1/apikeys/1 is undocumented","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/1","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/1","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 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality of this specific endpoint is unclear beyond its 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'/request':151 '0.02':10,24,67,150 '000':71 '0x8335':164 '20':70 '2913':165 '6':77 'Base network API' 'USDC API access' 'accept':59 'access':3,17,57 'across':107 'advertis':105 'ai':117 'analysi':121 'analyt':111 'api':2,16,38,56,80,174 'attach':90 'avail':201 'base':8,22,47,72,158 'base-network' 'beyond':213 'broader':103 'call':37 'caller':88 'categori':109 'classif':124 'connect':180 'content':205 'contract':163 'convers':141 'cost':65 'crawl':204 'data':110,114 'decim':78 'detail':187 'doc':171 'document':166,196 'embed':125 'endpoint':39,51,106,144,212 'estim':135 'exact':207 'exampl':200 'exchang':130 'export':115 'extrem':168 'feed':129 'financ':126 'four':108 'function':208 'gas':134 'gate':40 'generat':142 'geocod':139 'header':95 'infrastructur':137 'insight':116 'key':81 'l2':159 'label':54 'learn':119 'limit':83 'list':146 'lowpaymentfee' 'lowpaymentfee.com':29 'machin':118 'maximum':64 'metric':112 'micropay':6,20 'micropayment API' 'name':215 'network':9,23,48,160 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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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:24.122Z"}],"sources":[{"listingId":"ec4e1148-a432-4440-bc98-3612098699e9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:24.122Z","lastSeenAt":"2026-04-23T08:02:07.481Z"}],"details":{"listingId":"ec4e1148-a432-4440-bc98-3612098699e9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/1 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/1"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/apikeys/1"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without subscription or API key management","Agent-driven API consumption with per-request USDC micropayments on Base","Accessing data, AI, finance, or utility endpoints with zero upfront commitment"],"bestFor":["Developers or agents wanting frictionless pay-as-you-go API access","Use cases requiring no rate limits or subscription overhead","Crypto-native applications already operating on Base L2"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.406Z"},"updatedAt":"2026-04-23T08:02:07.481Z"}}