{"id":"186f2d04-0272-447c-b918-2ff67a7a3a45","shortId":"HwUzDC","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 `/api/v1/charges/89` is one of many endpoints offered by the provider, which hosts a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.\n\nThe x402 challenge confirms the endpoint is live and accepts payment via the \"exact\" scheme on Base, settling in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The maximum amount required is 20,000 base units, which at 6 decimals equals $0.02. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised; access is granted purely through per-call x402 payment.\n\nHowever, the specific functionality behind `/api/v1/charges/89` is not documented — the description is simply \"Premium API Access\" with no further detail on what data or service is returned. The provider's docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional documentation. Without an OpenAPI schema, example requests/responses, or detailed docs, the actual capability of this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-billing","json-response","post-method"],"categories":["api","payment"],"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/89 is not documented — 'Premium API Access' is the only description available.","All documentation pages (docs, api, pricing, README) render only a 'Connect wallet' prompt with no usable content.","No OpenAPI schema, example payloads, or response format documentation exists.","The provider lists many endpoints on its homepage but none match the /api/v1/charges/89 path, so the purpose of this specific endpoint is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/89","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/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no example requests or responses, and the docs pages are empty beyond a wallet-connect prompt. The specific functionality of /api/v1/charges/89 is undocumented, making this effectively a stub 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'0.02':10,24,78,117 '000':109 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':102 '20':108 '6':114 'Base network api' 'USDC micropayment api' 'accept':90,120 'access':6,20,36,134,159 'actual':200 'addit':188 'advertis':133 'ai':67 'amount':105 'analyt':66 'api':5,19,35,127,158,177 'application/json':125 'base':8,22,43,97,110 'base-network' 'behind':37,148 'broad':62 'call':141 'capabl':201 'catalog':63 'challeng':83 'confirm':84 'connect':183 'contract':101 'data':65,166 'decim':115 'descript':154 'detail':163,197 'doc':174,198 'document':152,189 'endpoint':30,54,86,119,205 'equal':116 'exact':94 'exampl':194 'financ':70 'function':147 'gate':3,17 'grant':136 'host':60 'howev':144 'infrastructur':73 'json-response' 'key':128 'learn':69 'limit':131 'live':88 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':68 'mani':53 'maximum':104 'network':44 'offer':55 'one':51 'openapi':192 'page':178 'particular':204 'path':48 'pay':9,23 'pay-per-call api' 'payment':91,143 'paywal':40 'per':11,25,79,140 'per-cal':139 'per-request-billing' 'post':121 'post-method' 'premium':4,18,34,157 'premium api access' 'price':76,175 'prompt':185 'provid':33,58,172 'pure':137 'rate':130 'remain':206 'render':180 'request':12,26,80,122 'requests/responses':195 'requir':106 'resourc':47 'return':124,170 'schema':193 'scheme':95 'servic':168 'settl':98 'simpli':156 'span':64 'specif':46,146 'unclear':207 'unit':111 'usdc':14,28,100 'usdc-settlement' 'util':74 'via':92 'wallet':184 'web3':71 'without':190 'x402':2,16,39,82,142 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"06707d7c-443e-4901-957c-62c1c7c02236","listingId":"186f2d04-0272-447c-b918-2ff67a7a3a45","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/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:37.429Z"}],"sources":[{"listingId":"186f2d04-0272-447c-b918-2ff67a7a3a45","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:37.429Z","lastSeenAt":"2026-04-22T10:31:35.128Z"}],"details":{"listingId":"186f2d04-0272-447c-b918-2ff67a7a3a45","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/89 \\\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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/89"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/89"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a pay-per-call API without API keys or subscriptions","Agent-driven workflows that need on-demand endpoint access settled in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that need keyless, per-request API access on Base","Low-commitment, pay-as-you-go API consumption at $0.02/call"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where per-request crypto settlement overhead matters","Anyone needing a clearly specified, well-documented API contract"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.988Z"},"updatedAt":"2026-04-22T10:31:35.128Z"}}