{"id":"8dd02da1-d385-48ee-bf57-5a19a25f0f66","shortId":"ujGDgP","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/135` 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 in USDC (contract 0x8335…2913) on the Base network using the \"exact\" scheme. The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02. No API keys or rate limits are advertised; access is granted per-call upon payment. The timeout for payment settlement is 300 seconds.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and no description of what the `/api/v1/accounts/135` endpoint specifically returns. The platform landing page lists many other endpoints but does not clarify what \"accounts/135\" delivers. Prospective callers should be aware that the actual functionality behind this specific path is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only 'Connect wallet' with no content.","The specific functionality of /api/v1/accounts/135 is undocumented; it is unclear what data or service this endpoint provides.","No OpenAPI spec or request/response schema is available.","No robots.txt or agents.txt found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/135","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/135","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema for the actual paid response, and the specific purpose of /api/v1/accounts/135 is entirely unclear. The docs pages are empty 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'/api/v1/accounts/135':47,192 '/docs':156 '/pricing':158 '/readme':160 '/request':13,28 '0.02':12,27,78,125 '000':115 '0x8335':99 '20':114 '2913':100 '300':148 '6':120 'Base network API' 'USDC micropayment API' 'access':7,22,38,134 'accounts/135':209 'actual':218 'advertis':60,133 'ai':67 'amount':111 'analyt':66 'api':6,21,37,127 'appear':48 'awar':215 'base':9,24,103,116 'behind':220 'beyond':181 'broad':62 'call':4,19,139 'caller':212 'catalog':63 'challeng':90 'clarifi':207 'connect':166 'content':172 'contract':98 'crawl':155 'crypto-paid endpoint' 'data':65 'decim':121 'deliv':210 'descript':188 'document':150 'endpoint':32,54,82,193,203 'equal':124 'exact':107 'extrem':152 'financ':70 'function':219 'grant':136 'infrastructur':73 'json-response' 'key':128 'land':198 'learn':69 'limit':131 'list':200 'live':84 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':68 'mani':53,201 'max':110 'network':104 'offer':55 'one':51 'openapi':176 'outputschema':184 'page':161,199 'path':46,223 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,93,141,145 'per':3,18,79,138 'per-cal':137 'platform':58,197 'post':92 'post-method' 'premium':5,20,36 'premium API access' 'price':76 'prompt':168 'prospect':211 'protocol':43 'provid':35 'rate':130 'request':80 'request/response':179 'requir':112 'return':86,163,195 'schema':180 'scheme':108 'second':149 'settl':95 'settlement':146 'span':64 'spars':153 'spec':177 'specif':45,194,222 'stub':185 'substant':171 'timeout':143 'undocu':225 'unit':117 'upon':140 'usdc':15,30,97,123 'usdc-base' 'use':105 'util':74 'valid':88 'via':10,25,39 'wallet':167 'web3':71 'x402':11,26,41,89,183 'x402 API' 'x402-payment'","prices":[{"id":"44ac5a35-2ef7-48c6-b778-1471b42754cc","listingId":"8dd02da1-d385-48ee-bf57-5a19a25f0f66","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/135","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:02.997Z"}],"sources":[{"listingId":"8dd02da1-d385-48ee-bf57-5a19a25f0f66","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/135","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:02.997Z","lastSeenAt":"2026-04-22T16:30:59.506Z"}],"details":{"listingId":"8dd02da1-d385-48ee-bf57-5a19a25f0f66","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# POST to the endpoint; without payment you receive the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/135\n# Returns 402 with x402 challenge JSON describing USDC payment on Base.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/accounts/135","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure, all at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge specifies maxAmountRequired of 20000 base units in USDC (6 decimals = $0.02) on Base.","source_url":"https://lowpaymentfee.com/api/v1/accounts/135"}],"useCases":["Accessing a premium API endpoint with per-call USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without API keys","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 keyless, per-request API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring free or subscription-based API access","Anyone needing clarity on what data this specific endpoint returns"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.356Z"},"updatedAt":"2026-04-22T16:30:59.506Z"}}