{"id":"ba54d5a0-9548-4fae-baf5-a62dfb4b8e3e","shortId":"pSyXfA","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" gated by the x402 payment protocol. The site hosts a broad catalog of pay-per-call 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 priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/78` is described only as \"Premium API Access\" with no further documentation on what it returns or what input it expects. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). Payment is made via the `exact` scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no examples available. The endpoint appears to generate or retrieve API keys based on the URL pattern, but this is speculative. Users should expect to experiment or contact the provider for details on the actual payload and response format.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","api-key-generation","micropayment"],"categories":["infrastructure","api-management"],"synonyms":["premium API key","x402 API access","Base USDC API","pay-per-call API","lowpaymentfee","micropayment API","crypto API gateway"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The exact purpose and response format of /api/v1/apikeys/78 is undocumented and unclear","No examples or integration guides found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/78","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific endpoint (/api/v1/apikeys/78) is unclear beyond the generic label \"Premium API 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'/api/v1/apikeys/78':105 '/docs':176 '/pricing':177 '/readme':180 '0.02':9,22,92,155 '000':144 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':165 '0x8335':149 '20':143 '2913':150 '300':168 '6':153 'Base USDC API' 'accept':133 'access':3,16,34,112 'actual':236 'ai':61 'analysi':65 'analyt':55 'api':2,15,33,52,111,212 'api-key-generation' 'appear':207 'avail':204 'base':8,21,100,145,152,214 'broad':45 'call':51 'catalog':46 'challeng':128 'classif':68 'confirm':129 'connect':186 'contact':229 'content':192 'convers':85 'crypto API gateway' 'data':54,58 'decim':154 'describ':107 'detail':233 'document':116,171 'embed':69 'endpoint':28,88,104,206 'estim':79 'exact':161 'exampl':203 'exchang':74 'expect':125,225 'experi':227 'export':59 'extrem':173 'feed':73 'financ':70 'format':240 'gas':78 'gate':35 'generat':86,209 'geocod':83 'host':43 'infrastructur':81 'input':123 'insight':60 'key':213 'learn':63 'live':132 'lowpaymentfee' 'lowpaymentfee.com':30 'machin':62 'made':158 'metric':56 'micropay':6,19 'micropayment' 'micropayment API' 'network':101 'openapi':196 'page':181 'pattern':218 'pay':49 'pay-per-cal':48 'pay-per-call API' 'pay-per-request' 'payload':237 'payment':39,139,156 'per':10,23,50,93 'post':134 'premium':1,14,32,110 'premium API key' 'price':72,90 'prompt':188 'protocol':40 'provid':31,231 'quot':77 'rate':75 'render':183 'report':57 'request':11,24,94,135 'request/response':199 'requir':137 'respons':239 'retriev':211 'return':120 'schema':200 'scheme':162 'second':169 'sentiment':64 'settl':95 'site':42 'span':53 'spars':174 'spec':197 'specif':103 'specul':222 'substant':191 'summar':67 'text':66 'timeout':170 'token':76 'unit':146 'url':217 'usdc':13,26,97,148 'usdc-base' 'user':223 'util':82 'valid':84 'via':4,17,159 'wallet':164,187 'web3':71 'x402':5,18,38,127 'x402 API access' 'x402-payment'","prices":[{"id":"87c37b4f-c81e-4998-b43c-6877b3efcb6b","listingId":"ba54d5a0-9548-4fae-baf5-a62dfb4b8e3e","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:39.771Z"}],"sources":[{"listingId":"ba54d5a0-9548-4fae-baf5-a62dfb4b8e3e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:39.771Z","lastSeenAt":"2026-04-23T05:01:54.929Z"}],"details":{"listingId":"ba54d5a0-9548-4fae-baf5-a62dfb4b8e3e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/78 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/78"},{"claim":"All listed APIs are priced at $0.02 per request with no minimums, no commitments, no API keys, and no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/78"}],"useCases":["Acquiring API keys or premium access tokens via a single micropayment","Programmatic pay-per-use access without traditional API key signup","Agent-driven procurement of API credentials on the Base network"],"bestFor":["Developers wanting no-signup, pay-per-call API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.653Z"},"updatedAt":"2026-04-23T05:01:54.929Z"}}