{"id":"0839527f-07bf-4d09-a43d-c7e95be74e0d","shortId":"v4Hfjm","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 specific resource path is `/api/v1/charges/269`, which is one of many endpoints offered by the provider. The broader platform advertises 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).\n\nPayment is handled via the x402 protocol using USDC on Base (contract 0x8335…2913). The challenge advertises a maxAmountRequired of 20000 base units, which at 6 decimals equals $0.02 per request. The provider's landing page confirms a flat $0.02/request pricing model with no API keys, no rate limits, and no minimum commitments. The endpoint accepts POST requests and returns application/json.\n\nHowever, the specific functionality behind `/api/v1/charges/269` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation, request/response schemas, or usage examples. Without knowing what this particular charge endpoint actually returns, callers should treat this as an opaque paid endpoint until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","json-response","post-method"],"categories":["api-gateway","misc"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","micropayment API","crypto-paid endpoint"],"warnings":["No documentation available for what /api/v1/charges/269 specifically returns or accepts as input","All doc pages (docs, pricing, README, api) returned only 'Connect wallet' with no content","The endpoint label 'Premium API Access' is generic and does not describe functionality","No OpenAPI spec, no request schema, no response schema available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/269","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/269","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation for what this specific endpoint actually does, no request/response schema, and no examples. The crawled docs/pricing/README pages were all empty beyond a wallet-connect prompt. The listing is effectively a 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'/request':140 '0.02':10,24,128,139 '0x8335':112 '20000':120 '2913':113 '6':125 'Base network API' 'USDC API access' 'accept':156 'access':6,20,36,176 'actual':208 'addit':193 'advertis':64,116 'ai':74 'analysi':78 'analyt':68 'api':5,19,35,145,175 'application/json':161 'base':8,22,43,110,121 'behind':37,166 'beyond':171 'broader':62 'caller':210 'categori':65 'challeng':115 'charg':206 'classif':81 'commit':153 'confirm':136 'connect':188 'contract':111 'convers':98 'crawl':178 'crypto-paid endpoint' 'data':67,71 'decim':126 'doc':179 'document':170,195,221 'embed':82 'endpoint':30,56,155,207,218 'equal':127 'estim':92 'exampl':200 'exchang':87 'export':72 'feed':86 'financ':83 'flat':138 'function':165 'gas':91 'gate':3,17 'generat':99 'geocod':96 'handl':102 'howev':162 'includ':66 'infrastructur':94 'insight':73 'json-response' 'key':146 'know':202 'label':173 'land':134 'learn':76 'limit':149 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':75 'mani':55 'maxamountrequir':118 'metric':69 'micropayment API' 'minimum':152 'model':142 'network':44 'offer':57 'one':53 'opaqu':216 'page':135,183 'paid':217 'particular':205 'path':48 'pay':9,23 'pay-per-call API' 'payment':100 'paywal':40 'per':11,25,129 'per-request-billing' 'platform':63 'post':157 'post-method' 'premium':4,18,34,174 'price':85,141,180 'prompt':190 'protocol':106 'provid':33,60,132 'quot':90 'rate':88,148 'readm':182 'report':70 'request':12,26,130,158 'request/response':196 'resourc':47 'return':160,185,209 'schema':197 'sentiment':77 'specif':46,164 'summar':80 'surfac':222 'technic':194 'text':79 'token':89 'treat':212 'unit':122 'usag':199 'usdc':14,28,108 'usdc-base' 'use':107 'util':95 'valid':97 'via':103 'wallet':189 'web3':84 'without':201 'x402':2,16,39,105 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"020ee925-6710-4259-9846-d6dff1325aad","listingId":"0839527f-07bf-4d09-a43d-c7e95be74e0d","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/269","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:41.797Z"}],"sources":[{"listingId":"0839527f-07bf-4d09-a43d-c7e95be74e0d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/269","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:41.797Z","lastSeenAt":"2026-04-22T09:01:00.682Z"}],"details":{"listingId":"0839527f-07bf-4d09-a43d-c7e95be74e0d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/269 \\\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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/269"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/269"},{"claim":"Flat pricing of $0.02 per request, no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a paid API resource without API keys or subscriptions","Agent-driven workflows that need on-demand paid endpoint calls settled in USDC on Base","Testing x402 payment flows against a live, low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integration","AI agents that need keyless, pay-per-call API access","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet","High-volume use cases where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.65Z"},"updatedAt":"2026-04-22T09:01:00.682Z"}}