{"id":"a3507153-4f3d-4008-9455-f50e624da3c7","shortId":"Bn6xW9","kind":"x402","title":"x402-gated premium API access on Base, paid per-call in USDC at $0.02/request.","tagline":"x402-gated premium API access on Base, paid per-call in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The specific resource at `/api/v1/charges/272` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is settled on-chain to the provider's wallet with a 300-second timeout window.\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs spanning 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). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific endpoint `/api/v1/charges/272` is labeled only as \"Premium API Access\" with no further documentation on what data or functionality it returns. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional technical detail. Without an OpenAPI schema, example responses, or detailed documentation, it is unclear what payload this particular endpoint produces. Agents should treat this as a low-documentation endpoint until the provider publishes richer specs.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-pricing","post-endpoint","no-api-key","no-rate-limit"],"categories":["api","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","Base network api","premium api access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific functionality of /api/v1/charges/272 ('Premium API Access') is undocumented — it is unclear what data or service it provides","All secondary pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content","No example request or response payloads are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/272","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/272","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no example request/response, and no documentation beyond a generic label. The docs/pricing/API pages are empty stubs. The actual functionality behind this specific charge ID is 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'/request':17,34 '0.02':16,33,75,147 '000':64 '0x8335':69 '20':63 '2913':70 '300':95 '6':80 'Base network api' 'USDC micropayment api' 'accept':56 'access':6,23,42,173 'addit':203 'advertis':103 'agent':224 'ai':116 'analysi':120 'analyt':110 'api':5,22,41,107,152,172,189 'base':8,25,49,65,72 'behind':43 'broader':100 'call':12,29,77 'chain':87 'charg':60 'classif':123 'commit':160 'connect':198 'convers':140 'data':109,113,180 'decim':81 'detail':205,213 'doc':186 'document':177,214,232 'embed':124 'endpoint':36,143,165,222,233 'equal':74 'estim':134 'exampl':210 'exchang':129 'export':114 'feed':128 'financ':125 'function':182 'gas':133 'gate':3,20 'generat':141 'geocod':138 'howev':162 'infrastructur':136 'insight':115 'key':153 'label':168 'learn':118 'limit':156 'list':145 'low':231 'low-document':230 'lowpaymentfee' 'lowpaymentfee.com':38,101 'machin':117 'metric':111 'minimum':159 'network':50 'no-api-key' 'no-rate-limit' 'on-chain':85 'openapi':208 'page':190 'paid':9,26 'particular':221 'pay-per-call api' 'payload':219 'payment':82 'paywal':46 'per':11,28,76,148 'per-cal':10,27 'per-call-pricing' 'platform':102 'post':57 'post-endpoint' 'premium':4,21,40,171 'premium api access' 'price':127,187 'produc':223 'prompt':200 'provid':39,90,236 'publish':237 'quot':132 'rate':130,155 'render':195 'report':112 'request':58,149 'requir':161 'resourc':53 'respons':211 'return':184 'richer':238 'schema':209 'second':96 'sentiment':119 'settl':84 'site':193 'span':108 'spec':239 'specif':52,164 'suit':105 'summar':122 'technic':204 'text':121 'timeout':97 'token':131 'treat':226 'unclear':217 'unit':66 'usdc':14,31,68,78 'usdc-base' 'use':79 'util':137 'valid':139 'wallet':92,199 'web3':126 'window':98 'without':206 'x402':2,19,45 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"9924c8ff-c629-48d6-a837-dad30dfde362","listingId":"a3507153-4f3d-4008-9455-f50e624da3c7","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/272","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:49.633Z"}],"sources":[{"listingId":"a3507153-4f3d-4008-9455-f50e624da3c7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/272","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:49.633Z","lastSeenAt":"2026-04-22T13:30:58.889Z"}],"details":{"listingId":"a3507153-4f3d-4008-9455-f50e624da3c7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/272 \\\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/272"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/272"},{"claim":"All endpoints 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 lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic pay-per-call access to a premium API without needing API keys or subscriptions","Agent-driven workflows that settle per-request payments in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers exploring x402 payment-gated APIs","Agents that can settle USDC payments on Base L2","Use cases needing keyless, commitment-free API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.298Z"},"updatedAt":"2026-04-22T13:30:58.889Z"}}