{"id":"8b1e0c3e-19a3-4c98-a472-379e328f806a","shortId":"GCPwsQ","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 pay-per-request \"Premium API Access\" resource at the path `/api/v1/accounts/71/balance`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint probed (`/api/v1/accounts/71/balance`) returns a live 402 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 call. Payment is made via the x402 protocol's `exact` scheme: the caller includes an `X-PAYMENT` header with a signed payment proof, and the server fulfills the request and returns JSON. No API keys or rate limits are advertised; access is purely payment-gated.\n\nDocumentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's `outputSchema` stub, and no explanation of what the balance endpoint actually returns. The endpoint name suggests it retrieves an account balance for account ID 71, but the exact response format and semantics are unknown.","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 or schema documentation available — response format is unknown","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content","The specific semantics of /api/v1/accounts/71/balance are undocumented — unclear what 'account 71' refers to","Platform appears to be a demo or early-stage project with many listed endpoints but no substantive docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/71/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/71/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 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of request parameters or response schema, and the docs/pricing/API pages are empty stubs. The purpose of this specific endpoint (account 71 balance) is opaque. Effectively a stub 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'0.02':77,119 '000':102 '0x8335':107 '20':101 '2913':108 '402':96 '6':114 '71':230 'Base network API' 'USDC micropayment API' 'access':41,162 'account':4,18,225,228 'account balance API' 'account-balance' 'actual':216 'advertis':161 'ai/ml':67 'analyt':66 'api':40,63,155,178 'balanc':5,19,214,226 'base':8,22,86,103,110 'beyond':201 'broader':52 'call':12,26,121 'caller':133 'challeng':97,204 'connect':186 'content':192 'data':65,70 'decim':115 'doc':176 'document':168 'endpoint':6,20,30,90,215,219 'exact':130,233 'explan':210 'extrem':173 'finance/web3':69 'format':235 'fulfil':148 'gate':3,17,62,167 'header':139 'id':229 'includ':134 'infer':68 'json':153 'json-response' 'key':156 'limit':159 'live':95 'lowpaymentfee' 'lowpaymentfee.com':32,54 'made':124 'name':220 'network':87 'offer':56 'openapi':196 'outputschema':206 'page':181 'part':49 'path':45 'pay':10,24,36 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':35 'payment':122,138,143,166 'payment-g':165 'per':11,25,37,78,120 'platform':53 'premium':39 'price':75,177 'probe':91 'prompt':188 'proof':144 'protocol':128 'provid':33 'pure':164 'rate':158 'readm':180 'render':183 'request':38,79,98,150 'request/response':199 'resourc':42 'respons':234 'retriev':223 'return':93,152,217 'schema':200 'scheme':131 'semant':237 'server':147 'servic':73 'settl':81 'sign':142 'sinc':111 'site':171 'span':64 'spec':197 'specif':89 'stub':207 'substant':191 'suggest':221 'thin':174 'translat':117 'unit':104 'unknown':239 'usdc':14,28,83,106,112 'usdc-base' 'use':113 'util':72 'varieti':58 'via':125 'wallet':187 'x':137 'x-payment':136 'x402':2,16,61,127,203 'x402 API' 'x402-gated':1,15,60 'x402-payment'","prices":[{"id":"b5332e74-995b-4da8-a478-e053517851e9","listingId":"8b1e0c3e-19a3-4c98-a472-379e328f806a","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/71/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":"2026-04-18T18:40:03.689Z"}],"sources":[{"listingId":"8b1e0c3e-19a3-4c98-a472-379e328f806a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/71/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:03.689Z","lastSeenAt":"2026-04-28T05:33:51.559Z"}],"details":{"listingId":"8b1e0c3e-19a3-4c98-a472-379e328f806a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/71/balance \\\n  -H \"X-PAYMENT: <x402-signed-payment-proof>\" \\\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 a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/accounts/71/balance"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data behind a micropayment wall","Demonstrating x402 protocol payment flows on Base","Integrating pay-per-request APIs without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base automatically","Use cases needing keyless, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who prefer subscription-based pricing over per-call payments","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.22Z"},"updatedAt":"2026-04-28T05:33:51.559Z"}}