{"id":"08530018-08f7-41b9-98d2-6d0587f22e68","shortId":"CLw9Yk","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-call API endpoints 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/266` is labeled \"Premium API Access\" in the x402 challenge. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per call. Payment is made via the x402 exact scheme by including an X-PAYMENT header with each POST request. The endpoint returns application/json responses with a 300-second payment timeout.\n\nDocumentation on the site is extremely sparse — the docs, pricing, API, 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 particular charge endpoint actually returns. The landing page lists many API paths but does not clarify what `/api/v1/charges/266` specifically does versus the other listed 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","json-response","no-api-key","no-rate-limit"],"categories":["api-gateway","pay-per-call"],"synonyms":["lowpaymentfee","x402 API","micropayment API","USDC pay-per-call","Base network API","crypto-paid API","402 payment endpoint"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/charges/266 ('Premium API Access') is not described anywhere; it is unclear what data or service it provides.","No OpenAPI schema or request/response examples are available.","No robots.txt or agents.txt found on the domain."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/266","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/266","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 it accepts USDC payments on Base at $0.02 per call. However, there is no OpenAPI schema, no request/response examples, and the docs pages are empty stubs. The specific functionality of /api/v1/charges/266 is entirely undocumented, making this effectively a stub 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'0.02':10,24,91,143 '000':130 '0x8335':135 '20':129 '2913':136 '300':172 '402 payment endpoint' '6':139 'Base network API' 'USDC pay-per-call' 'access':6,20,36,118 'actual':218,247 'advertis':125 'ai':60 'analysi':64 'analyt':59 'api':5,19,35,55,101,117,186,225 'application/json':168 'awar':244 'base':8,22,43,98,131,138 'base-network' 'behind':37,249 'call':54,145 'challeng':122,124 'charg':216 'clarifi':230 'classif':67 'commit':108 'connect':194 'content':200 'convers':84 'crypto-paid API' 'data':58 'decim':140 'descript':211 'doc':184 'document':176 'embed':68 'endpoint':30,56,87,112,166,217,239,251 'equal':142 'estim':78 'exact':152 'exampl':208 'exchang':73 'extrem':181 'feed':72 'financ':69 'function':248 'gas':77 'gate':3,17 'generat':85 'geocod':82 'header':160 'includ':155 'infrastructur':80 'json-response' 'key':102 'label':115 'land':221 'learn':62 'limit':105 'list':223,238 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'made':148 'mani':224 'maxamountrequir':127 'micropayment API' 'network':44 'no-api-key' 'no-rate-limit' 'openapi':204 'oper':47 'page':189,222 'particular':215 'path':226 'pay':9,23,52 'pay-per-cal':51 'pay-per-request' 'payment':146,159,174 'paywal':40 'per':11,25,53,92,144 'post':163 'premium':4,18,34,116 'price':71,89,185 'prompt':196 'prospect':240 'provid':33,46 'quot':76 'rate':74,104 'readm':188 'render':191 'request':12,26,93,164 'request/response':207 'requir':109 'respons':169 'return':167,219 'schema':205 'scheme':153 'second':173 'sentiment':63 'settl':94 'site':179 'span':57 'spars':182 'specif':111,233 'suit':49 'summar':66 'text':65 'timeout':175 'token':75 'undocu':253 'unit':132 'usdc':14,28,96,134 'usdc-settlement' 'user':241 'util':81 'valid':83 'versus':235 'via':149 'wallet':195 'web3':70 'x':158 'x-payment':157 'x402':2,16,39,121,151 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"97012e03-d753-4d60-af78-f2ae949e160d","listingId":"08530018-08f7-41b9-98d2-6d0587f22e68","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/266","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:53.246Z"}],"sources":[{"listingId":"08530018-08f7-41b9-98d2-6d0587f22e68","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/266","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:53.246Z","lastSeenAt":"2026-04-24T01:32:05.562Z"}],"details":{"listingId":"08530018-08f7-41b9-98d2-6d0587f22e68","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/266 \\\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":"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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/266"},{"claim":"Endpoint described as 'Premium API Access' in x402 challenge with mimeType application/json and maxTimeoutSeconds 300","source_url":"https://lowpaymentfee.com/api/v1/charges/266"},{"claim":"Provider lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access with crypto payment"],"bestFor":["Developers who want pay-per-use API access without subscriptions","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native, keyless API consumption"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.189Z"},"updatedAt":"2026-04-24T01:32:05.562Z"}}