{"id":"ab519d3d-355b-4142-a9a8-16c29a4f7334","shortId":"JkdQXC","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/167`, which is one of many endpoints offered by the lowpaymentfee.com platform. The platform advertises a broad catalog 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).\n\nPayment is settled on-chain via USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge advertises a maxAmountRequired of 20000 base units; since USDC uses 6 decimals, this equals $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The platform emphasizes no API keys, no rate limits, and instant access.\n\nHowever, the specific functionality behind `/api/v1/charges/167` is unclear — the description is simply \"Premium API Access\" with no further documentation, input schema, or example responses available. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this particular endpoint returns, agents should treat this as a generic paid endpoint whose actual utility is unverified.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","no-api-key","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee"],"warnings":["The specific functionality of /api/v1/charges/167 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","No input or output schema is provided; callers cannot know what to send or what to expect back.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but this specific charge endpoint's relationship to those categories is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/167","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/167","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, no examples, and the actual functionality behind this specific path is entirely undescribed. Docs pages returned only 'Connect wallet' with no 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'/request':144 '0.02':10,24,131,143 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':113 '20000':121 '6':127 'Base network API' 'USDC API access' 'access':6,20,36,159,174 'across':145 'actual':219 'advertis':64,117,139 'agent':209 'ai':76 'analysi':80 'analyt':70 'api':5,19,35,152,173 'asset':112 'avail':184 'base':8,22,43,111,122 'behind':37,164 'broad':66 'catalog':67 'chain':107 'challeng':116 'classif':83 'connect':195 'consist':134 'content':201 'convers':100 'data':69,73 'decim':128 'descript':169 'doc':186 'document':178 'embed':84 'emphas':150 'endpoint':30,56,147,207,217 'equal':130 'estim':94 'exampl':182 'exchang':89 'export':74 'feed':88 'financ':85 'flat':140 'function':163 'gas':93 'gate':3,17 'generat':101 'generic':215 'geocod':98 'howev':160 'infrastructur':96 'input':179 'insight':75 'instant':158 'json-response' 'key':153 'know':203 'learn':78 'limit':156 'lowpaymentfee' 'lowpaymentfee.com':32,60 'machin':77 'mani':55 'maxamountrequir':119 'metric':71 'micropayment API' 'network':44 'no-api-key' 'offer':57 'on-chain':105 'one':53 'page':190 'paid':216 'particular':206 'path':48 'pay':9,23 'pay-per-call API' 'payment':102 'paywal':40 'per':11,25,132 'per-request-billing' 'platform':61,63,149 'premium':4,18,34,172 'price':87,141,187 'prompt':197 'provid':33 'quot':92 'rate':90,155 'readm':189 'report':72 'request':12,26,133 'resourc':47 'respons':183 'return':192,208 'schema':180 'sentiment':79 'settl':104 'simpli':171 'sinc':124 'site':137 'span':68 'specif':46,162 'substant':200 'summar':82 'text':81 'token':91 'treat':211 'unclear':167 'unit':123 'unverifi':222 'usdc':14,28,109,125 'usdc-base' 'use':126 'util':97,220 'valid':99 'via':108 'wallet':196 'web3':86 'whose':218 'without':202 'x402':2,16,39,115 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"9a03bcb5-6f1e-4c9a-85a7-f853a12a1d6e","listingId":"ab519d3d-355b-4142-a9a8-16c29a4f7334","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/167","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:17.639Z"}],"sources":[{"listingId":"ab519d3d-355b-4142-a9a8-16c29a4f7334","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/167","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:17.639Z","lastSeenAt":"2026-04-24T05:02:31.056Z"}],"details":{"listingId":"ab519d3d-355b-4142-a9a8-16c29a4f7334","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/167 \\\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":"Platform advertises $0.02/request flat pricing 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 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/charges/167"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Programmatic agent access to paid endpoints using on-chain USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol","Agents needing keyless, pay-per-call API access","Low-cost per-request billing without commitments"],"notFor":["Users needing well-documented API contracts with clear input/output schemas","High-volume use cases where $0.02/request adds up quickly","Anyone requiring offline or fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.813Z"},"updatedAt":"2026-04-24T05:02:31.056Z"}}