{"id":"b964099c-5eda-4ad2-ab14-d1eebc719de2","shortId":"xTneZ5","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\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind per-request USDC micropayments on the Base network.\n\nThe specific endpoint `/api/v1/charges/133` is labeled \"Premium API Access\" in the x402 challenge. The challenge indicates it accepts exact-scheme payments on Base using USDC (contract 0x8335…2913) with a maxAmountRequired of 20000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02/request price point. However, the crawled documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schemas for this specific endpoint are unknown. Without documentation on what this endpoint accepts or returns, its concrete functionality beyond the generic \"Premium API Access\" label remains unclear.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","micropayment api","pay-per-request api","USDC gated endpoint","base network api"],"warnings":["No documentation available — docs, pricing, and README pages all render only a 'Connect wallet' prompt","The actual functionality of /api/v1/charges/133 ('Premium API Access') is unspecified; it is unclear what data or service it provides","No request or response schema is documented or discoverable","The endpoint path '/charges/133' suggests a specific charge record rather than a general-purpose API, which may indicate limited or niche functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/133","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/133","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 request/response schema, and the actual functionality behind \"Premium API Access\" is completely unspecified. Docs, pricing, and README pages all returned only a wallet-connect 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'/request':186 '0.02':10,24,126,185 '0x8335':109 '20000':115 '2913':110 '6':121 'USDC gated endpoint' 'accept':99,225 'access':6,20,36,90,236 'actual':210 'addit':162 'advertis':134,161 'ai':62 'analysi':166 'analyt':61 'api':5,19,35,58,89,138,235 'attach':147 'base':8,22,80,105,116 'base network api' 'base-network' 'behind':72 'beyond':231 'caller':145 'challeng':94,96 'classif':169 'concret':229 'connect':200 'consist':129 'contract':108 'convers':177 'crawl':191 'data':60,179 'decim':122 'detail':207 'doc':194 'document':192,220 'embed':170 'endpoint':30,47,84,163,216,224 'exact':101 'exact-schem':100 'exchang':173 'export':180 'feed':172 'financ':65 'flat':135 'function':230 'gate':3,17,71 'generic':233 'geocod':175 'header':152 'host':54 'howev':189 'indic':97 'infrastructur':68 'json-response' 'key':139 'label':87,237 'learn':64 'limit':142 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':63 'mani':46 'maxamountrequir':113 'micropay':77 'micropayment api' 'network':81 'no-api-key' 'offer':48 'one':44 'page':193 'pay':9,23 'pay-per-request api' 'payment':40,103,151,157 'per':11,25,74,127 'per-request':73 'per-request-billing' 'platform':52,160 'point':188 'premium':4,18,34,88,234 'price':136,171,187,195 'prompt':202 'proof':158 'protocol':41 'provid':33 'rate':141,174 'readm':196 'remain':238 'request':12,26,75,128 'request/response':211 'requir':144 'return':197,227 'schema':212 'scheme':102 'sentiment':165 'simpli':146 'sinc':118 'site':132 'span':59 'specif':83,215 'suit':56 'summar':168 'technic':206 'text':167 'translat':124 'unclear':239 'unit':117 'unknown':218 'usdc':14,28,76,107,119 'usdc-micropayment' 'use':106,120 'util':69 'valid':155,176 'via':37 'wallet':201 'web3':66 'without':219 'x':150 'x-payment':149 'x402':2,16,39,93,156 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"cd0369b5-c3af-4675-bba6-aa08d8c24c12","listingId":"b964099c-5eda-4ad2-ab14-d1eebc719de2","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/133","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:04.909Z"}],"sources":[{"listingId":"b964099c-5eda-4ad2-ab14-d1eebc719de2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/133","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:04.909Z","lastSeenAt":"2026-04-24T06:32:00.964Z"}],"details":{"listingId":"b964099c-5eda-4ad2-ab14-d1eebc719de2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/133 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/133"},{"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 offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/133"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, no-rate-limit API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring free or fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.409Z"},"updatedAt":"2026-04-24T06:32:00.964Z"}}