{"id":"ef2eb766-d602-41fe-8252-b465dd219b22","shortId":"x8rACy","kind":"x402","title":"Premium API access key via x402 micropayment on Base network using USDC.","tagline":"Premium API access key via x402 micropayment on Base network using USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at `/api/v1/apikeys/73`, payable per-request via the x402 protocol on the Base network using USDC. The x402 challenge confirms the endpoint is live, accepting POST requests with an exact payment scheme. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs spanning 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 $0.02 per request with no API keys, no rate limits, and instant access. However, the specific endpoint `/api/v1/apikeys/73` is described only as \"Premium API Access\" — it likely provisions or returns an API key rather than serving one of the listed data endpoints directly.\n\nDocumentation is extremely sparse: the /docs, /api, /pricing, and /README 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 examples available. The endpoint is confirmed live via the 402 challenge, but what it actually returns upon successful payment is unknown beyond the mime type `application/json`.","tags":[],"capabilities":["x402-payment","usdc-base-network","per-request-micropayment","api-key-provisioning","json-response"],"categories":["infrastructure","api-access"],"synonyms":["API key purchase","premium access token","x402 API key","micropayment API","pay-per-use API key","USDC API access","Base network API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content","The actual response payload of /api/v1/apikeys/73 is unknown — it is unclear what 'Premium API Access' concretely provides","No request body schema is documented; it is unknown whether a POST body is required or what fields it accepts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/73","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/73","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 via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual behavior of this specific endpoint (what it returns) is undocumented. This is effectively a stub 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'/api/v1/apikeys/73':36,150 '/docs':181 '/pricing':183 '/readme':185 '0.02':82,133 '000':73 '20':72 '402':219 '6':78 'API key purchase' 'Base network API' 'USDC API access' 'accept':59 'access':3,15,33,145,157 'actual':224 'advertis':89 'ai':102 'amount':69 'analysi':106 'analyt':96 'api':2,14,32,93,138,156,164 'api-key-provisioning' 'application/json':235 'avail':211 'base':9,21,47,74 'beyond':231 'broader':86 'challeng':53,220 'classif':109 'confirm':54,215 'connect':191 'convers':126 'data':95,99,173 'decim':79 'describ':152 'detail':198 'direct':175 'document':176,207 'embed':110 'endpoint':26,56,129,149,174,213 'equal':81 'estim':120 'exact':64 'exampl':210 'exchang':115 'export':100 'extrem':178 'feed':114 'financ':111 'gas':119 'generat':127 'geocod':124 'howev':146 'infrastructur':122 'insight':101 'instant':144 'json-response' 'key':4,16,139,165 'learn':104 'like':159 'limit':142 'list':131,172 'live':58,216 'lowpaymentfee.com':28,87 'machin':103 'maximum':68 'metric':97 'micropay':7,19 'micropayment API' 'mime':233 'network':10,22,48 'one':169 'openapi':202 'page':186 'pay-per-use API key' 'payabl':37 'payment':65,228 'per':39,83,134 'per-request':38 'per-request-micropayment' 'platform':88 'post':60 'premium':1,13,31,155 'premium access token' 'price':113 'prompt':193 'protocol':44 'provid':29 'provis':160 'quot':118 'rate':116,141 'rather':166 'render':188 'report':98 'request':40,61,84,135 'request/response':205 'requir':70 'resourc':34 'return':162,225 'schema':206 'scheme':66 'sentiment':105 'serv':168 'span':94 'spars':179 'spec':203 'specif':148 'success':227 'suit':91 'summar':108 'technic':197 'text':107 'token':117 'type':234 'unit':75 'unknown':230 'upon':226 'usdc':12,24,50,77 'usdc-base-network' 'use':11,23,49 'util':123 'valid':125 'via':5,17,41,217 'wallet':192 'web3':112 'x402':6,18,43,52 'x402 API key' 'x402-payment'","prices":[{"id":"8b44687a-1cde-4a69-9894-d4b372d67c3d","listingId":"ef2eb766-d602-41fe-8252-b465dd219b22","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:40.941Z"}],"sources":[{"listingId":"ef2eb766-d602-41fe-8252-b465dd219b22","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:40.941Z","lastSeenAt":"2026-04-23T05:01:54.958Z"}],"details":{"listingId":"ef2eb766-d602-41fe-8252-b465dd219b22","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/73 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns status 402 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/73"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/73"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Acquiring a premium API key for the lowpaymentfee.com platform via a single micropayment","Programmatic provisioning of API credentials without traditional signup or subscription","Agent-driven procurement of API access using on-chain USDC payments"],"bestFor":["Agents or developers who want instant API key provisioning without account creation","Users comfortable with x402 crypto micropayments on Base","Scenarios requiring no-signup, pay-as-you-go API access"],"notFor":["Users who need detailed documentation or OpenAPI specs before purchasing","Those who prefer traditional fiat payment methods or subscription billing","Production use cases requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.618Z"},"updatedAt":"2026-04-23T05:01:54.958Z"}}