{"id":"2702a128-b7d0-4582-b4e0-1dc35812269b","shortId":"9UqhqC","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\" behind an x402 paywall on the Base network. The provider operates a suite of pay-per-request APIs spanning data & analytics, 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 Base with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/46` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to the payTo address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint actually returns. The landing page lists many API paths but does not clarify what `/api/v1/charges/46` specifically does versus the other named endpoints. Prospective users should be aware that the actual functionality behind this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-method","no-api-key"],"categories":["api-gateway","misc"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/charges/46 ('Premium API Access') is not explained anywhere","Cannot determine what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/46","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/46","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 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no clear description of what this specific endpoint does. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'0.02':10,24,90,146 '000':135 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':164 '0x8335':140 '20':134 '2913':141 '300':167 '6':150 'Base network API' 'USDC micropayment API' 'accept':120 'access':6,20,36,118 'actual':208,237 'address':163 'ai':59 'analysi':63 'analyt':58 'api':5,19,35,55,100,117,176,215 'awar':234 'base':8,22,43,97,136,143 'base-network' 'behind':37,239 'challeng':125 'clarifi':220 'classif':66 'commit':107 'confirm':126 'connect':185 'content':191 'convers':83 'crypto-paid API' 'data':57 'decim':151 'descript':202 'doc':175 'document':170 'embed':67 'endpoint':30,86,111,207,229,241 'equal':145 'estim':77 'exact':158 'exampl':199 'exchang':72 'extrem':172 'feed':71 'financ':68 'function':238 'gas':76 'gate':3,17 'generat':84 'geocod':81 'given':147 'infrastructur':79 'key':101 'land':211 'learn':61 'limit':104 'list':114,213 'live':129 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':60 'made':154 'mani':214 'maximum':132 'name':228 'network':44 'no-api-key' 'openapi':195 'oper':47 'page':180,212 'path':216 'pay':9,23,52 'pay-per-call API' 'pay-per-request':51 'payment':152 'payto':162 'paywal':40 'per':11,25,53,91 'post':121 'post-method' 'premium':4,18,34,116 'premium API access' 'price':70,88,177 'prompt':187 'prospect':230 'provid':33,46 'quot':75 'rate':73,103 'readm':179 'render':182 'request':12,26,54,92,122,130 'request/response':198 'requir':108 'return':209 'schema':196 'scheme':159 'second':168 'sentiment':62 'settl':93 'span':56 'spars':173 'specif':110,206,223 'suit':49 'summar':65 'text':64 'timeout':169 'token':74 'undocu':243 'unit':137 'usdc':14,28,95,139,148 'usdc-settlement' 'user':231 'util':80 'valid':82 'versus':225 'via':155 'wallet':186 'web3':69 'x402':2,16,39,124,157 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"0bf8df82-e43b-4d78-baaf-e045c654c3f3","listingId":"2702a128-b7d0-4582-b4e0-1dc35812269b","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:22.943Z"}],"sources":[{"listingId":"2702a128-b7d0-4582-b4e0-1dc35812269b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:22.943Z","lastSeenAt":"2026-04-22T09:01:02.668Z"}],"details":{"listingId":"2702a128-b7d0-4582-b4e0-1dc35812269b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/46 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/46"},{"claim":"All endpoints 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 provider offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/46"}],"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, AI, finance, or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-request API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput with predictable flat-rate pricing","Users without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.697Z"},"updatedAt":"2026-04-22T09:01:02.668Z"}}