{"id":"fb5e05cc-33f4-4583-9e56-c7c15fc077aa","shortId":"QbjuJV","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 site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment analysis, 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/11` is labeled \"Premium API Access\" and returns a valid x402 challenge (version 1, scheme \"exact\") requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation 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 spec, no request/response schema documentation, and no examples of what this specific endpoint actually returns. The site's landing page lists many API paths but provides no detail on request parameters or response formats. As a result, while the endpoint is confirmed live and the payment mechanics are clear, the actual functionality behind \"Premium API Access\" at this particular path is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","http-post"],"categories":["api-gateway","payments"],"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, /pricing, /api, and /README all render only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for this endpoint","The specific functionality of /api/v1/charges/11 ('Premium API Access') is undefined — it is unclear what it returns after payment","The site lists many API paths on its landing page but none have documented request/response contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/11","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no indication of what data or functionality this specific '/charges/11' path actually provides. The docs pages are empty. This is effectively a stub 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'/api/v1/charges/11':111 '/docs':167 '/pricing':168 '/readme':171 '0.02':10,24,89,142 '000':131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '0x8335':136 '1':124 '20':130 '2913':137 '300':151 'Base network API' 'USDC micropayment API' 'accept':156 'access':6,20,36,116,243 'actual':201,238 'address':147 'ai/ml':60 'analysi':63 'analyt':59 'api':5,19,35,56,99,115,210,242 'application/json':161 'base':8,22,43,96,132,139 'base-network' 'behind':37,240 'broad':49 'call':55 'catalog':50 'challeng':122 'classif':65 'clear':236 'commit':106 'confirm':229 'connect':177 'content':183 'convers':82 'crypto-paid API' 'data':58 'detail':215 'document':162,192 'embed':66 'endpoint':30,85,110,155,200,227 'equal':141 'estim':76 'exact':126 'exampl':195 'exchang':71 'extrem':164 'feed':70 'financ':67 'format':221 'function':239 'gas':75 'gate':3,17 'generat':83 'geocod':80 'host':47 'http':157 'http-post' 'infer':61 'infrastructur':78 'json-response' 'key':100 'label':113 'land':206 'limit':103 'list':208 'live':230 'lowpaymentfee' 'lowpaymentfee.com':32 'mani':209 'mechan':234 'network':44 'openapi':187 'page':172,207 'paramet':218 'particular':246 'path':211,247 'pay':9,23,53 'pay-per-cal':52 'pay-per-call API' 'pay-per-request' 'payment':143,233 'paywal':40 'per':11,25,54,90 'post':158 'premium':4,18,34,114,241 'premium API access' 'price':69,87 'prompt':179 'provid':33,213 'quot':74 'rate':72,102 'render':174 'request':12,26,91,127,217 'request/response':190 'requir':107 'respons':220 'result':224 'return':118,160,202 'schema':191 'scheme':125 'second':152 'sent':145 'sentiment':62 'settl':92 'site':46,204 'span':57 'spars':165 'spec':188 'specif':109,199 'summar':64 'timeout':153 'token':73 'unit':133 'unknown':249 'usdc':14,28,94,135 'usdc-settlement' 'util':79 'valid':81,120 'version':123 'wallet':178 'web3':68 'x402':2,16,39,121 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"5c141c4c-4cd7-4c2b-9c57-3da6277fda6e","listingId":"fb5e05cc-33f4-4583-9e56-c7c15fc077aa","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:06.720Z"}],"sources":[{"listingId":"fb5e05cc-33f4-4583-9e56-c7c15fc077aa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:06.720Z","lastSeenAt":"2026-04-24T06:32:01.021Z"}],"details":{"listingId":"fb5e05cc-33f4-4583-9e56-c7c15fc077aa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/11 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/charges/11","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/11"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/11"},{"claim":"Site lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without API key management","Agent-driven pay-per-call workflows settled in USDC on Base","Accessing data, AI, finance, or utility APIs with micropayments"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring fiat-only payment rails","High-volume use cases where per-request pricing may not be cost-effective"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.377Z"},"updatedAt":"2026-04-24T06:32:01.021Z"}}