{"id":"d0e457df-6695-4379-a254-d7e56564e453","shortId":"vBGY6Z","kind":"x402","title":"Pay-per-call API key generation on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call API key generation on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It accepts POST requests and charges 0.02 USDC (on Base network) per call, settled directly on-chain to the provider's wallet. The specific resource path `/api/v1/apikeys/53` suggests it generates or retrieves an API key, though the exact response payload is not documented.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services (geocoding, validation, conversion). All endpoints share the same $0.02/request pricing with no API keys required, no rate limits, and instant access via x402 payment headers on the Base L2 network.\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 usage examples available from the crawled content.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","api-key-generation","no-rate-limits","no-subscription"],"categories":["infrastructure","auth"],"synonyms":["api key purchase","pay-per-use api","x402 api access","crypto api payment","base network api","USDC micropayment api"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages render only 'Connect wallet' with no technical content","Exact request body format and response payload are undocumented","The purpose of '/api/v1/apikeys/53' is inferred from the path — not explicitly documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/53","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/53","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 request/response schema, no examples, and the docs pages are empty. The actual functionality of this specific endpoint is only inferable from its URL 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'/request':128 '0.02':12,28,52,127 'USDC micropayment api' 'accept':47 'access':40,140 'advertis':94 'ai/ml':106 'analysi':109 'analyt':105 'api':5,21,39,80,102,132,156 'api key purchase' 'api-key-generation' 'avail':186 'base':9,25,55,147 'base network api' 'broader':91 'call':4,20,58 'chain':63 'charg':51 'classif':111 'connect':165 'content':190 'convers':121 'crawl':189 'crypto api payment' 'data':104,115 'detail':172 'direct':60 'doc':155 'document':89,150,181 'embed':112 'endpoint':34,123 'exact':84 'exampl':185 'extrem':152 'finance/crypto':113 'generat':7,23,76 'geocod':119 'header':144 'infer':107 'instant':139 'key':6,22,81,133 'l2':148 'limit':137 'lowpaymentfee.com':36,92 'market':114 'network':56,149 'no-rate-limits' 'no-subscription' 'on-chain':61 'openapi':176 'page':160 'path':72 'pay':2,18,99 'pay-per-cal':1,17 'pay-per-request':98 'pay-per-use api' 'payload':86 'payment':44,143 'per':3,13,19,29,57,100 'per-request-billing' 'platform':93 'post':48 'premium':38 'price':129,157 'prompt':167 'protocol':45 'provid':37,66 'rate':136 'readm':159 'render':162 'request':14,30,49,101 'request/response':179 'requir':134 'resourc':71 'respons':85 'retriev':78 'schema':180 'sentiment':108 'servic':118 'settl':59 'share':124 'span':103 'spars':153 'spec':177 'specif':70 'suggest':74 'suit':96 'summar':110 'technic':171 'though':82 'usag':184 'usdc':16,32,53 'usdc-base' 'util':117 'valid':120 'via':10,26,41,141 'wallet':68,166 'x402':11,27,43,142 'x402 api access' 'x402-payment'","prices":[{"id":"b0d40434-3e59-4fb8-8c7e-913a5df7e9eb","listingId":"d0e457df-6695-4379-a254-d7e56564e453","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:23.507Z"}],"sources":[{"listingId":"d0e457df-6695-4379-a254-d7e56564e453","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:23.507Z","lastSeenAt":"2026-04-23T09:31:52.759Z"}],"details":{"listingId":"d0e457df-6695-4379-a254-d7e56564e453","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/53 \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","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 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/53"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/53"},{"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 & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatically obtaining API keys without traditional signup flows","Agent-driven access to premium endpoints via on-chain micropayments","Integrating pay-as-you-go API access into automated workflows"],"bestFor":["Developers wanting instant API access without account creation","AI agents that need to autonomously purchase API credentials","Users preferring crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation before purchasing","High-volume consumers who want bulk pricing or enterprise plans","Developers without Base network USDC for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.437Z"},"updatedAt":"2026-04-23T09:31:52.759Z"}}