{"id":"6f134c59-0eb6-4d4c-b53c-35f7b9e31a10","shortId":"snVmVT","kind":"x402","title":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/accounts/35/balance`. It is part of a broader platform that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 payment protocol on the Base network.\n\nThe specific endpoint probed returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which translates to $0.02 per request. Payment is made inline via the `X-PAYMENT` header using the x402 \"exact\" scheme; no API keys, accounts, or rate limits are required. The payment recipient is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, and the endpoint accepts POST requests returning `application/json`.\n\nDocumentation on the site is extremely thin — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no explanation of what the `/accounts/35/balance` resource actually returns. The landing page lists many other endpoints at $0.02 each but provides no detail on inputs or outputs for any of them. Treat this listing as a stub until richer documentation becomes available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","account-balance","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (docs, pricing, api, README) render only a 'Connect wallet' prompt with no content","The purpose and output of /api/v1/accounts/35/balance is undocumented — unclear what 'account 35' refers to","Cannot verify what data is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/35/balance","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/35/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no explanation of what the balance resource actually returns. Effectively a 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'/api':157 '/api/v1/accounts/35/balance':42 '/docs':155 '/pricing':156 '/readme':159 '0.02':107,198 '000':93 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '0x8335':98 '20':92 '2913':99 '6':102 'Base network API' 'USDC micropayment API' 'accept':142 'access':37 'account':4,18,128 'account balance API' 'account-balance' 'actual':188 'ai/ml':63 'analyt':62 'api':36,58,126 'application/json':146 'avail':222 'balanc':5,19 'base':8,22,79,94,101 'becom':221 'broader':48 'call':12,26 'challeng':88 'connect':165 'content':171 'data':61,66 'decim':103 'detail':203 'document':147,220 'dozen':52 'endpoint':6,20,30,59,83,141,196 'exact':123 'explan':182 'extrem':152 'finance/web3':65 'gate':3,17,71 'header':119 'infer':64 'infrastructur':68 'inlin':113 'input':205 'json-response' 'key':127 'land':191 'limit':131 'list':193,214 'lowpaymentfee' 'lowpaymentfee.com':32 'made':112 'mani':194 'network':80 'offer':51 'openapi':175 'output':207 'page':160,192 'part':45 'path':41 'pay':10,24,55 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':54 'payment':75,110,118,135 'per':11,25,56,108 'platform':49 'post':143 'premium':35 'probe':84 'prompt':167 'protocol':76 'provid':33,201 'rate':130 'recipi':136 'render':162 'request':57,89,109,144 'request/response':178 'requir':133 'resourc':38,187 'return':85,145,189 'richer':219 'schema':179 'scheme':124 'site':150 'span':60 'spec':176 'specif':82 'stub':217 'thin':153 'translat':105 'treat':212 'unit':95 'usdc':14,28,97 'usdc-base' 'use':120 'util':69 'via':72,114 'wallet':166 'x':117 'x-payment':116 'x402':2,16,74,87,122 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"5274ca80-6970-4592-8590-2470f309820c","listingId":"6f134c59-0eb6-4d4c-b53c-35f7b9e31a10","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/35/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:34.182Z"}],"sources":[{"listingId":"6f134c59-0eb6-4d4c-b53c-35f7b9e31a10","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/35/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:34.182Z","lastSeenAt":"2026-04-30T08:34:13.307Z"}],"details":{"listingId":"6f134c59-0eb6-4d4c-b53c-35f7b9e31a10","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/35/balance \\\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 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/accounts/35/balance"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data behind a per-request USDC paywall","Demonstrating x402 payment protocol integration on Base","Agent-driven balance lookups without API key provisioning"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","Agents that can settle USDC payments on Base in real time","Use cases needing keyless, zero-commitment API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need fiat-only payment options","High-volume batch queries where per-call pricing is inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.576Z"},"updatedAt":"2026-04-30T08:34:13.307Z"}}