{"id":"f825c7f3-2611-41d0-8b2d-742f2d8e068c","shortId":"PbTCcy","kind":"x402","title":"x402-gated account balance endpoint on Base, paid per-call in USDC.","tagline":"x402-gated account balance endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/accounts/85/balance`. It is part of a broader platform that offers dozens of x402-payable API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all settled on the Base network using USDC.\n\nThe specific endpoint probed returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is via the x402 \"exact\" scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation 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 beyond the x402 challenge's `outputSchema` stub, and no explanation of what the `/accounts/85/balance` endpoint actually returns. The endpoint name suggests it retrieves a balance for account ID 85, but the exact response format and semantics are unknown. The platform appears to be a demonstration or early-stage x402 marketplace rather than a mature, documented API provider.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-pricing","account-balance","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response format for this endpoint.","The purpose and response shape of /api/v1/accounts/85/balance is unknown; 'Premium API Access' is a generic label.","Platform may be a demo or early-stage project; maturity is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/85/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/85/balance","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 spec, no documentation beyond a landing page listing, no request/response examples, and the purpose of this specific endpoint (/accounts/85/balance) is unexplained. Effectively a stub 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'/api':159 '/api/v1/accounts/85/balance':42 '/docs':157 '/pricing':158 '/readme':161 '/request':119 '0.02':106,118 '000':89 '0x8335':94 '20':88 '2913':95 '300':132 '6':101 '85':210 'Base network API' 'USDC micropayment API' 'access':37,143 'account':4,18,208 'account balance API' 'account-balance' 'across':120 'actual':197 'advertis':114,142 'ai/ml':62 'analyt':61 'api':36,57,136,238 'appear':222 'balanc':5,19,206 'base':8,22,73,90,97 'beyond':182 'broader':48 'call':12,26 'challeng':84,185 'connect':167 'consist':109 'content':173 'data':60,65 'decim':102 'demonstr':226 'document':152,237 'dozen':52 'earli':229 'early-stag':228 'endpoint':6,20,30,58,79,122,196,200 'exact':128,213 'explan':191 'extrem':154 'finance/web3':64 'flat':115 'format':215 'gate':3,17 'grant':145 'header':151 'id':209 'infer':63 'json-response' 'key':137 'limit':140 'lowpaymentfee' 'lowpaymentfee.com':32 'marketplac':232 'matur':236 'name':201 'network':74 'offer':51 'openapi':177 'outputschema':187 'page':162 'paid':9,23 'part':45 'path':41 'pay-per-call API' 'payabl':56 'payment':123,150 'per':11,25,107 'per-cal':10,24 'per-call-pricing' 'platform':49,221 'premium':35 'price':116 'probe':80 'prompt':169 'provid':33,239 'pure':146 'rate':139 'rather':233 'render':164 'request':85,108 'request/response':180 'resourc':38 'respons':214 'retriev':204 'return':81,198 'schema':181 'scheme':129 'second':133 'semant':217 'servic':68 'settl':70 'sinc':98 'site':112 'span':59 'spec':178 'specif':78 'stage':230 'stub':188 'suggest':202 'thin':155 'timeout':134 'translat':104 'unit':91 'unknown':219 'usdc':14,28,76,93,99 'usdc-base' 'use':75,100 'util':67 'via':125 'wallet':168 'x402':2,16,55,83,127,149,184,231 'x402 paid endpoint' 'x402-gated':1,15 'x402-payable':54 'x402-payment'","prices":[{"id":"6c20e7dd-e813-4578-ab0a-7186875beeef","listingId":"f825c7f3-2611-41d0-8b2d-742f2d8e068c","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/85/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":"2026-04-18T18:40:14.006Z"}],"sources":[{"listingId":"f825c7f3-2611-41d0-8b2d-742f2d8e068c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/85/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:14.006Z","lastSeenAt":"2026-04-28T04:04:34.701Z"}],"details":{"listingId":"f825c7f3-2611-41d0-8b2d-742f2d8e068c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/85/balance \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equating to $0.02.","source_url":"https://lowpaymentfee.com/api/v1/accounts/85/balance"},{"claim":"The platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying an account balance behind an x402 paywall","Testing x402 payment flows on Base with USDC","Demonstrating per-request micropayment API access"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that can settle USDC on Base for per-call API access","Prototyping pay-per-use API integrations without API keys"],"notFor":["Production use requiring documented request/response schemas","Users who need non-crypto payment methods","High-volume use cases where $0.02/call adds up quickly without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.724Z"},"updatedAt":"2026-04-28T04:04:34.701Z"}}