{"id":"48aceb36-9d59-4e32-b7cf-213c23716ca6","shortId":"JUfgzN","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 advertises categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request.\n\nThe specific endpoint `/api/v1/charges/186` returned a valid x402 402 challenge when probed, confirming it is live. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised; access is granted per-request upon payment.\n\nHowever, the actual functionality behind this specific charge ID (186) is unclear. The platform's landing page lists numerous endpoints across different domains (analytics, AI, finance, utilities), but the `/api/v1/charges/186` path does not map obviously to any of them. No OpenAPI schema, detailed documentation, or example request/response payloads were found — the docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt. As a result, the precise input parameters and output format for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","Base network api","premium api access"],"warnings":["The specific functionality of /api/v1/charges/186 is unknown — it does not clearly map to any listed endpoint category on the site.","No OpenAPI schema, example payloads, or meaningful documentation were found.","All documentation pages (docs, pricing, API, README) rendered only a 'Connect wallet' prompt with no technical content.","The platform lists many endpoint categories but it is unclear which are actually functional behind the x402 paywall."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/186","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/186","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific functionality behind charge ID 186 is entirely unclear. The crawled docs/pricing/API pages all returned only 'Connect wallet' with no substantive 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'0.02':10,24,70,110 '000':106 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':99 '186':149 '20':105 '402':81 '6':114 'Base network api' 'USDC micropayment api' 'accept':118 'access':6,20,36,132 'across':160 'actual':142 'advertis':54,131 'ai':59,164 'amount':103 'analyt':58,163 'api':5,19,35,125,194 'application/json':123 'base':8,22,94,107 'base-network' 'behind':144 'categori':55 'challeng':82 'charg':147 'confirm':85 'connect':200 'contract':98 'data':57 'decim':115 'detail':182 'differ':161 'doc':191 'document':183 'domain':162 'endpoint':30,47,75,117,159,215 'exampl':185 'financ':62,165 'format':212 'found':189 'function':143 'gate':3,17 'given':111 'grant':134 'howev':140 'i.e':109 'id':148 'includ':56 'infrastructur':65 'input':208 'json-response' 'key':126 'land':155 'learn':61 'limit':129 'list':157 'live':88 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':60 'mani':46 'map':173 'maximum':102 'network':95 'no-api-key' 'numer':158 'obvious':174 'offer':48 'one':44 'openapi':180 'output':211 'page':156,195 'paramet':209 'path':170 'pay':9,23 'pay-per-call api' 'pay-per-request' 'payload':187 'payment':40,89,139 'per':11,25,71,136 'per-request':135 'platform':52,153 'post':119 'precis':207 'premium':4,18,34 'premium api access' 'price':68,192 'probe':84 'prompt':202 'protocol':41 'provid':33 'rate':128 'remain':216 'render':197 'request':12,26,72,120,137 'request/response':186 'result':205 'return':77,122 'schema':181 'settl':91 'specif':74,146 'unclear':151 'unit':108 'unknown':217 'upon':138 'usdc':14,28,97,112 'usdc-settlement' 'use':96 'util':66,166 'valid':79 'via':37 'wallet':201 'web3':63 'x402':2,16,39,80 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"c8929f77-45d9-4c21-9ff1-520c41d1fcaa","listingId":"48aceb36-9d59-4e32-b7cf-213c23716ca6","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/186","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:24.291Z"}],"sources":[{"listingId":"48aceb36-9d59-4e32-b7cf-213c23716ca6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/186","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:24.291Z","lastSeenAt":"2026-04-24T04:03:33.041Z"}],"details":{"listingId":"48aceb36-9d59-4e32-b7cf-213c23716ca6","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/186 \\\n  -H 'Content-Type: application/json'\n# Returns 402 with x402 challenge describing USDC payment on Base ($0.02)","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with USDC on Base, maxAmountRequired 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/charges/186"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/186"},{"claim":"Listed endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a paid API endpoint without needing API keys or subscriptions","Agent-driven workflows that settle per-request payments in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment-gated APIs","AI agents that can autonomously pay for API calls via crypto micropayments","Users who want pay-as-you-go access without account registration"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone requiring non-crypto (fiat) payment methods","Use cases requiring clearly defined input/output schemas upfront"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.505Z"},"updatedAt":"2026-04-24T04:03:33.041Z"}}