{"id":"4d9f1e4e-3bd8-443e-90f3-ea98e5ee04aa","shortId":"aMe7Vm","kind":"x402","title":"Pay-per-call premium API access via x402 on Base network using USDC at $0.02/request.","tagline":"Pay-per-call premium API access via x402 on Base network using USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific endpoint `/api/v1/apikeys/47` accepts POST requests and charges 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the X-PAYMENT header using the x402 \"exact\" scheme.\n\nThe broader lowpaymentfee.com platform advertises multiple API categories including 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.\n\nHowever, the specific endpoint `/api/v1/apikeys/47` is labeled \"Premium API Access\" without further documentation on what it returns. No OpenAPI schema, detailed docs, or example responses are available — the docs, pricing, and API pages all just show a \"Connect wallet\" prompt. The actual functionality behind this particular endpoint path is unclear and may relate to API key generation or management.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key-required","post-method"],"categories":["infrastructure","api-access"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available — docs, pricing, and API pages only show 'Connect wallet'","The specific functionality of /api/v1/apikeys/47 ('Premium API Access') is undocumented","No OpenAPI schema or response examples available","The endpoint path suggests API key management but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/47","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/47","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/request in USDC on Base), but there is no documentation on what this specific endpoint returns, no OpenAPI schema, no example requests or responses, and the docs pages are empty. The actual functionality of /api/v1/apikeys/47 is 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'/request':17,34 '0.02':16,33,70,138 '000':58 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':63 '20':57 '402 payment API' '6':75 'Base network API' 'USDC micropayment API' 'accept':52 'access':7,24,42,150,160 'actual':192 'advertis':95 'ai':107 'analysi':111 'analyt':101 'api':6,23,41,97,143,159,182,205 'avail':177 'base':11,28,59,66 'behind':194 'broader':92 'call':4,21 'categori':98 'charg':56 'classif':114 'connect':188 'convers':131 'crypto-paid API' 'data':100,104 'decim':76 'detail':171 'doc':172,179 'document':163 'embed':115 'endpoint':36,50,134,154,197 'equal':69 'estim':125 'exact':89 'exampl':174 'exchang':120 'export':105 'feed':119 'financ':116 'function':193 'gas':124 'generat':132,207 'geocod':129 'header':85 'howev':151 'includ':99 'infrastructur':127 'insight':106 'instant':149 'key':144,206 'label':157 'learn':109 'limit':147 'list':136 'lowpaymentfee' 'lowpaymentfee.com':38,93 'machin':108 'made':79 'manag':209 'may':202 'metric':102 'multipl':96 'network':12,29,67 'no-api-key-required' 'openapi':169 'page':183 'particular':196 'path':198 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':46,77,84 'per':3,20,71,139 'platform':94 'post':53 'post-method' 'premium':5,22,40,158 'price':118,180 'prompt':190 'protocol':47 'provid':39 'quot':123 'rate':121,146 'relat':203 'report':103 'request':54,72,140 'respons':175 'return':167 'schema':170 'scheme':90 'sentiment':110 'show':186 'specif':49,153 'summar':113 'text':112 'token':122 'unclear':200 'unit':60 'usdc':14,31,62,73 'usdc-base-network' 'use':13,30,74,86 'util':128 'valid':130 'via':8,25,43,80 'wallet':189 'web3':117 'without':161 'x':83 'x-payment':82 'x402':9,26,45,88 'x402 API' 'x402-payment'","prices":[{"id":"06567391-8e43-4e0b-8559-4467b1e52365","listingId":"4d9f1e4e-3bd8-443e-90f3-ea98e5ee04aa","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:22.913Z"}],"sources":[{"listingId":"4d9f1e4e-3bd8-443e-90f3-ea98e5ee04aa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:22.913Z","lastSeenAt":"2026-04-23T09:31:52.726Z"}],"details":{"listingId":"4d9f1e4e-3bd8-443e-90f3-ea98e5ee04aa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/47 \\\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":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/47"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/47"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without traditional API key signup","Agent-driven API consumption with per-request USDC micropayments on Base","Accessing data, AI, finance, or utility endpoints with no subscription commitment"],"bestFor":["Developers wanting instant API access without registration","AI agents that can settle x402 payments autonomously","Users who prefer pay-per-use over subscription models"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.519Z"},"updatedAt":"2026-04-23T09:31:52.726Z"}}