{"id":"09da3787-8b94-435c-93b0-f19d29249bd4","shortId":"TkDL8h","kind":"x402","title":"x402-gated API key endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated API key endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which advertises a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific resource `/api/v1/apikeys/80` is listed as \"Premium API Access\" in the x402 challenge. The challenge confirms it accepts an exact payment scheme on Base, requiring up to 20,000 base units of USDC (0x8335…0913), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no explanation of what \"Premium API Access\" actually returns or what input parameters it expects. The platform's landing page lists many other endpoints (analytics, AI, finance, utilities) but provides no detail on any of them beyond names and prices. Without documentation, the actual functionality behind this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","json-response","post-method"],"categories":["api-access","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API key","premium API access","pay-per-call API","USDC API","Base network API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for this endpoint","The purpose and functionality of '/api/v1/apikeys/80' ('Premium API Access') is completely undocumented","The broader platform lists many endpoints but provides no technical detail on any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/80","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what the endpoint actually does, what inputs it accepts, or what it returns. No OpenAPI spec, no examples, no request/response schemas. The name 'Premium API Access' is vague. This is effectively a stub 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'0.02':10,24,73,121 '000':112 '0913':118 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':132 '0x8335':117 '20':111 '300':135 '6':125 'Base network API' 'USDC API' 'accept':101,140 'access':36,92,183 'actual':184,220 'address':131 'advertis':54 'ai':62,202 'analyt':61,201 'api':4,18,35,58,91,152,182 'application/json':145 'base':8,22,81,107,113 'base-network' 'behind':222 'beyond':213 'challeng':96,98 'confirm':99 'connect':161 'content':167 'data':60 'decim':126 'detail':208 'doc':151 'document':146,218 'endpoint':6,20,30,47,139,200,224 'equal':120 'exact':103 'expect':191 'explan':178 'extrem':148 'financ':65,203 'function':221 'gate':3,17 'given':122 'infrastructur':68 'input':188 'json-response' 'key':5,19 'land':195 'learn':64 'list':88,197 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':63 'mani':46,198 'name':214 'network':82 'offer':48 'one':44 'openapi':171 'page':156,196 'paramet':189 'pay':9,23 'pay-per-call API' 'payment':40,104,127 'per':13,27,74 'per-request-pricing' 'platform':52,193 'post':141 'post-method' 'premium':34,90,181 'premium API access' 'price':71,153,216 'prompt':163 'protocol':41 'provid':33,206 'readm':155 'render':158 'request':14,28,75,142 'request/response':174 'requir':108 'resourc':85 'return':144,185 'schema':175 'scheme':105 'second':136 'sent':129 'settl':76 'span':59 'spars':149 'spec':172 'specif':84 'suit':56 'timeout':137 'unit':114 'unknown':226 'usdc':12,26,78,116,123 'usdc-settlement' 'util':69,204 'via':37 'wallet':162 'web3':66 'without':217 'x402':2,16,39,95 'x402 API key' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"f6450f60-ec9d-4dad-b7e8-a30848c30237","listingId":"09da3787-8b94-435c-93b0-f19d29249bd4","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:42.736Z"}],"sources":[{"listingId":"09da3787-8b94-435c-93b0-f19d29249bd4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:42.736Z","lastSeenAt":"2026-04-23T04:02:11.957Z"}],"details":{"listingId":"09da3787-8b94-435c-93b0-f19d29249bd4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/80 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/80"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/80"},{"claim":"All APIs on the platform are priced at $0.02 per request with no minimums or commitments","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":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Acquiring API access via a single micropayment without traditional API key signup","Agent-driven programmatic access to premium endpoints using x402 payment flow","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that need keyless, pay-per-call API access on Base","Projects wanting to test USDC micropayment flows"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone requiring known, well-documented request/response schemas before integration","High-volume use cases where $0.02 per request adds up without volume discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.511Z"},"updatedAt":"2026-04-23T04:02:11.957Z"}}