{"id":"efb386f1-1798-4f04-8ef3-259fb84b8e53","shortId":"LaQ826","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","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 hosts a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind x402 micropayments on the Base network.\n\nThe specific endpoint `/api/v1/charges/108` is labeled \"Premium API Access\" in the x402 challenge. The challenge advertises a maximum cost of 20,000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme: callers attach an X-PAYMENT header with a signed payment to the payTo address. No API keys, rate limits, or upfront commitments are required — access is instant upon payment.\n\nThe crawled landing page lists sibling endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, the specific functionality behind `/api/v1/charges/108` (\"Premium API Access\") is not documented beyond its title. No OpenAPI schema, request/response examples, or detailed docs were found; the docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content. This makes it difficult to determine what data or service this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-base","micropayment","pay-per-request","no-api-key","instant-access"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment required API","crypto-gated API"],"warnings":["The specific functionality of /api/v1/charges/108 ('Premium API Access') is not documented — it is unclear what data or service it returns.","No OpenAPI schema, request examples, or response examples are available.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content.","The endpoint name 'Premium API Access' is generic and does not describe a concrete capability."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/108","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/charges/108","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' is completely undescribed. The docs pages return only 'Connect wallet' with no 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'/request':194 '0.02':10,24,112,193 '000':100 '0x8335':106 '20':99 '2913':107 '402 payment required API' '6':117 'Base network API' 'USDC micropayment API' 'access':6,20,36,87,152,205 'addit':237 'address':141 'advertis':94 'ai':62 'analysi':171 'analyt':61 'api':5,19,35,58,86,143,204,226 'attach':128 'base':8,22,77,101,109 'behind':72,201 'beyond':209 'caller':127 'challeng':91,93 'classif':174 'commit':149 'connect':232 'content':238 'contract':105 'convers':186 'cost':97 'crawl':158 'crypto-gated API' 'data':60,167,246 'decim':118 'detail':218 'determin':244 'difficult':242 'doc':219,223 'document':208 'embed':175 'endpoint':30,47,81,163,251 'equal':111 'estim':183 'exact':125 'exampl':216 'exchang':178 'export':168 'feed':177 'financ':65 'found':221 'function':200 'gas':182 'gate':3,17,71 'generat':188 'geocod':184 'header':133 'host':54 'howev':197 'infrastructur':68 'insight':169 'instant':154 'instant-access' 'key':144 'label':84 'land':159 'learn':64 'limit':146 'list':161 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':63 'made':121 'make':240 'mani':46 'maximum':96 'metric':165 'micropay':74 'micropayment' 'network':78 'no-api-key' 'offer':48 'one':44 'openapi':213 'page':160,227 'particular':250 'pay':9,23 'pay-per-call API' 'pay-per-request' 'payment':40,119,132,137,156 'payto':140 'per':11,25,113 'platform':52 'point':196 'premium':4,18,34,85,203 'price':176,195,224 'prompt':234 'protocol':41 'provid':33 'quot':181 'rate':145,179 'render':229 'report':166 'request':12,26,114 'request/response':215 'requir':151 'return':252 'schema':214 'scheme':126 'sentiment':170 'servic':248 'sibl':162 'sign':136 'span':59 'specif':80,199 'suit':56 'summar':173 'text':172 'titl':211 'token':180 'unit':102 'upfront':148 'upon':155 'usdc':14,28,104,115 'usdc-base' 'use':116 'util':69 'valid':185 'via':37,122 'wallet':233 'web3':66 'x':131 'x-payment':130 'x402':2,16,39,73,90,124 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"35c91dea-077f-49a4-b8a1-94c23e9d0eba","listingId":"efb386f1-1798-4f04-8ef3-259fb84b8e53","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/charges/108","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:09.740Z"}],"sources":[{"listingId":"efb386f1-1798-4f04-8ef3-259fb84b8e53","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/108","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:09.740Z","lastSeenAt":"2026-04-24T06:32:01.165Z"}],"details":{"listingId":"efb386f1-1798-4f04-8ef3-259fb84b8e53","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/108 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-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/charges/108"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/108"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data or services"],"bestFor":["Developers or agents who want keyless, pay-per-request API access","x402-compatible clients on the Base network","Low-volume or exploratory API usage without subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who prefer flat-rate or subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.209Z"},"updatedAt":"2026-04-24T06:32:01.165Z"}}