{"id":"10ca3d13-c74d-49cb-bfb8-805c69742164","shortId":"TCeCtQ","kind":"x402","title":"Premium API access via x402 micropayment on Base network, $0.02/request in USDC.","tagline":"Premium API access via x402 micropayment on Base network, $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is part of a broader platform offering multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/56` appears to be an API key provisioning or access endpoint. The x402 challenge confirms it accepts POST requests, charges a maximum of 20,000 base units of USDC (which equals $0.02 given USDC's 6 decimals), and settles on the Base L2 network using the \"exact\" payment scheme. No API keys or rate limits are advertised — access is gated purely by per-request micropayment.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what this specific endpoint returns or expects as input beyond a POST with JSON content type.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","api-key-provisioning","per-request-billing","no-rate-limits"],"categories":["infrastructure","api-access"],"synonyms":["api key generation","premium access","pay-per-request API","x402 endpoint","USDC micropayment API","Base network API"],"warnings":["No OpenAPI or schema documentation available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific function of /api/v1/apikeys/56 is unclear — it may provision API keys or grant access, but this is unconfirmed","No request body schema or response examples are provided anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/56","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/56","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 schema, no request/response examples, and the purpose of this specific endpoint (apikeys/56) is unclear beyond the generic 'Premium API Access' 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'/api/v1/apikeys/56':78 '/docs':158 '/pricing':159 '/readme':162 '/request':11,24 '0.02':10,23,65,109 '000':102 '20':101 '6':113 'Base network API' 'USDC micropayment API' 'accept':94 'access':3,16,34,87,135 'advertis':134 'ai':54 'analyt':53 'api':2,15,33,49,83,128 'api key generation' 'api-key-provisioning' 'appear':79 'avail':152 'base':8,21,73,103,119 'base-network' 'beyond':197 'broader':45 'categori':50 'challeng':91 'charg':97 'confirm':92 'connect':168 'content':174,202 'data':52 'decim':114 'descript':186 'detail':185 'document':144 'endpoint':28,77,88,153,191 'equal':108 'exact':124 'exampl':182 'expect':194 'extrem':146 'financ':57 'gate':137 'given':110 'includ':51 'infrastructur':60 'input':196 'json':201 'key':84,129 'l2':120 'land':149 'learn':56 'limit':132 'list':151 'lowpaymentfee.com':30 'machin':55 'maximum':99 'micropay':6,19,143 'multipl':48 'network':9,22,74,121 'no-rate-limits' 'offer':47 'openapi':178 'page':150,163 'paid':68 'part':42 'pay-per-request API' 'payment':38,125 'per':66,141 'per-request':140 'per-request-billing' 'platform':46 'post':95,199 'premium':1,14,32 'premium access' 'price':63,155 'prompt':170 'protocol':39 'provid':31 'provis':85 'pure':138 'rate':131 'render':165 'request':67,96,142 'request/response':181 'return':192 'schema':179 'scheme':126 'settl':116 'spars':147 'specif':76,190 'substant':173 'type':203 'unit':104 'usdc':13,26,70,106,111 'usdc-micropayment' 'use':122 'util':61 'via':4,17,35 'wallet':169 'web3':58 'x402':5,18,37,90 'x402 endpoint' 'x402-payment'","prices":[{"id":"c737dc6c-3b07-40e1-abbe-b6a07ca2ce62","listingId":"10ca3d13-c74d-49cb-bfb8-805c69742164","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:43.356Z"}],"sources":[{"listingId":"10ca3d13-c74d-49cb-bfb8-805c69742164","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:43.356Z","lastSeenAt":"2026-04-23T04:02:11.962Z"}],"details":{"listingId":"10ca3d13-c74d-49cb-bfb8-805c69742164","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/56 \\\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":"Endpoint returns 402 with x402 challenge accepting USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/apikeys/56"},{"claim":"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: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/56"}],"useCases":["Programmatically obtaining API keys or premium access tokens via micropayment","Agent-driven access to gated API resources without pre-registration","Pay-as-you-go API consumption without subscriptions or commitments"],"bestFor":["AI agents needing instant, keyless API access via cryptocurrency micropayments","Developers who want to avoid API key management and subscription overhead","Applications requiring low-friction, per-call billing on Base L2"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","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":"2026-02-17T23:13:28.496Z"},"updatedAt":"2026-04-23T04:02:11.962Z"}}