{"id":"23edf60d-68e6-40c0-9713-0a6d3303402c","shortId":"Q5hdq8","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/accounts/120` appears to be one of many endpoints offered by the platform, which advertises a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.\n\nThe endpoint is live and returns a valid x402 challenge on POST. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The x402 challenge specifies an \"exact\" payment scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through per-request micropayment.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/accounts/120` endpoint specifically returns. The platform lists many other endpoints (analytics, AI, finance, utilities) but provides no detail on input parameters or response formats for any of them. The specific purpose of the `accounts/120` resource is unclear — it could be an account lookup, profile data, or something else entirely.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","micropayment API","pay-per-call API","Base USDC API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The specific purpose and response format of /api/v1/accounts/120 is unknown","No OpenAPI schema or request/response examples provided","No robots.txt or agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/120","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/accounts/120","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is virtually no documentation: no OpenAPI schema, no request/response examples, and no explanation of what the accounts/120 endpoint actually returns. The docs pages are empty beyond a wallet-connect prompt. The listing is essentially a 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'/request':13,28 '0.02':12,27,78,116 '000':111 '0x8335':103 '20':110 '2913':104 '300':131 '6':119 'Base USDC API' 'access':7,22,38,142 'account':228 'accounts/120':220 'advertis':60,141 'ai':67,198 'amount':108 'analyt':66,197 'api':6,21,37,135,157 'appear':48 'base':9,24,98,112 'base-network' 'broad':62 'call':4,19 'catalog':63 'challeng':90,123 'connect':166 'content':172 'contract':102 'could':225 'data':65,231 'decim':120 'descript':183 'detail':204 'doc':156 'document':151 'els':234 'endpoint':32,54,82,188,196 'entir':235 'equal':115 'exact':126 'exampl':180 'extrem':153 'financ':70,199 'format':210 'grant':144 'infrastructur':73 'input':206 'json-response' 'key':136 'learn':69 'limit':139 'list':193 'live':84 'lookup':229 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':68 'mani':53,194 'maximum':107 'micropay':150 'micropayment API' 'network':99 'no-api-key' 'offer':55 'one':51 'openapi':176 'page':161 'paramet':207 'path':46 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'payment':42,93,127 'per':3,18,79,148 'per-request':147 'per-request-billing' 'platform':58,192 'post':92 'premium':5,20,36 'price':76,158 'profil':230 'prompt':168 'protocol':43 'provid':35,202 'pure':145 'purpos':217 'rate':138 'readm':160 'render':163 'request':80,149 'request/response':179 'resourc':221 'respons':209 'return':86,190 'schema':177 'scheme':128 'second':132 'settl':95 'someth':233 'span':64 'spars':154 'specif':45,189,216 'specifi':124 'substant':171 'timeout':133 'unclear':223 'unit':113 'usdc':15,30,101,117 'usdc-micropayment' 'use':100,118 'util':74,200 'valid':88 'via':10,25,39 'wallet':167 'web3':71 'x402':11,26,41,89,122 'x402 premium API' 'x402-payment'","prices":[{"id":"ac5a0d8f-eeff-4033-8ef7-8d4f8032425c","listingId":"23edf60d-68e6-40c0-9713-0a6d3303402c","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/accounts/120","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:49.162Z"}],"sources":[{"listingId":"23edf60d-68e6-40c0-9713-0a6d3303402c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/120","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:49.162Z","lastSeenAt":"2026-04-23T07:30:57.567Z"}],"details":{"listingId":"23edf60d-68e6-40c0-9713-0a6d3303402c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/120 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units on Base network using USDC","source_url":"https://lowpaymentfee.com/api/v1/accounts/120"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/120"}],"useCases":["Accessing premium API data without subscription or API key management","Agent-driven per-request API consumption with crypto micropayments","Programmatic access to account-level data via x402 payment flow"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.072Z"},"updatedAt":"2026-04-23T07:30:57.567Z"}}