{"id":"d0099d3c-b51f-49c1-8435-c125b58f810a","shortId":"jxCy9R","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $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 platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories — all priced at $0.02 per request.\n\nThe specific endpoint `/api/v1/charges/379` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The platform advertises a simple pay-per-use model: no API keys, no rate limits, no commitments, and instant access. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) via the x402 exact-payment scheme.\n\nThe x402 challenge is live and returns a maxAmountRequired of 20000 base units. Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the site's advertised pricing. The endpoint accepts POST requests and returns application/json. However, no OpenAPI schema, request/response examples, or detailed documentation were found — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-gateway","pay-per-use"],"synonyms":["premium API","low fee API","x402 API","micropayment API","USDC API access","Base network API","pay-per-call API"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet' with no substantive content","The specific functionality of /api/v1/charges/379 ('Premium API Access') is not described anywhere; it is unclear what data or service it provides","No OpenAPI schema, request body schema, or response examples are available","Cannot verify what this endpoint actually returns upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/379","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/379","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base), but there is no documentation, no request/response schema, and the specific functionality of this endpoint (/api/v1/charges/379) is entirely undescribed. Docs pages return only a wallet-connect prompt with no 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'0.02':12,28,72,157 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':129 '20000':147 '6':153 'Base network API' 'USDC API access' 'accept':169 'access':7,23,40,83,118 'advertis':100,165 'ai':60 'analyt':59 'api':6,22,39,82,109,189 'application/json':174 'base':9,25,124,148 'base-network' 'beyond':95 'call':4,20,159 'categori':68 'challeng':87,139 'commit':115 'connect':197 'consist':160 'content':203 'contract':128 'data':58 'decim':154 'detail':182 'doc':187 'document':94,183 'endpoint':34,51,77,168 'equal':156 'exact':90,134 'exact-pay':133 'exampl':180 'financ':63 'found':185 'function':91 'howev':175 'infrastructur':66 'instant':117 'json-response' 'key':110 'label':80,97 'learn':62 'limit':113 'live':141 'low fee API' 'lowpaymentfee.com':36 'machin':61 'mani':50 'maxamountrequir':145 'micropayment API' 'model':107 'network':125 'no-api-key' 'offer':52 'one':48 'openapi':177 'page':192 'pay':2,18,104 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'pay-per-us':103 'payment':44,119,135 'per':3,13,19,29,73,105,158 'platform':55,99 'post':170 'premium':5,21,38,81 'premium API' 'price':70,166,188 'prompt':199 'protocol':45 'provid':37 'rate':112 'readm':191 'render':194 'request':14,30,74,171 'request/response':179 'return':143,173 'schema':178 'scheme':136 'settl':121 'simpl':102 'sinc':150 'site':163 'span':57 'specif':76 'substant':202 'unit':149 'usdc':16,32,127,151 'usdc-settlement' 'use':106,126,152 'util':67 'via':10,26,41,130 'wallet':198 'web3':64 'x402':11,27,43,86,132,138 'x402 API' 'x402-payment'","prices":[{"id":"8f14957f-c433-4e22-8fee-af7d04b94b5a","listingId":"d0099d3c-b51f-49c1-8435-c125b58f810a","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/379","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:24.747Z"}],"sources":[{"listingId":"d0099d3c-b51f-49c1-8435-c125b58f810a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/379","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:24.747Z","lastSeenAt":"2026-04-23T23:02:31.473Z"}],"details":{"listingId":"d0099d3c-b51f-49c1-8435-c125b58f810a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/379 \\\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 platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/379"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/379"},{"claim":"The platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request 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","Users who want no-commitment, no-signup API access"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone who cannot transact USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.67Z"},"updatedAt":"2026-04-23T23:02:31.473Z"}}