{"id":"da7d8c9e-2f46-41f7-b426-d9b57133d6d8","shortId":"5DTcPZ","kind":"x402","title":"Check account balance via x402 micropayment on Base network for $0.02 per request.","tagline":"Check account balance via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns account balance information for account ID 158. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/accounts/158/balance` accepts POST requests and is gated behind an x402 payment challenge. The maximum amount required per call is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 USD (USDC uses 6 decimals). Payment is made via the `exact` scheme, meaning the caller pays a fixed amount per request with no API keys, rate limits, or subscriptions required.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the balance response contains. The endpoint is confirmed live (returns a proper 402 challenge), but the actual functionality behind the paywall is undocumented. The platform advertises itself as offering low-fee, keyless API access on Base, but without documentation it is difficult to assess the quality or structure of the data returned.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API","402 payment endpoint"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific purpose of account 158's balance endpoint is unclear — it may be a demo or placeholder","No response examples available; actual data structure behind the paywall is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/158/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/158/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The actual data returned behind the paywall is completely undocumented, making this effectively a stub 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'0.02':11,24,105 '000':95 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':100 '158':38 '20':94 '402':187 '402 payment endpoint' '6':109 'Base network API' 'USDC pay-per-call' 'accept':76 'access':209 'account':2,15,32,36 'account balance API' 'account-balance' 'across':52 'actual':191 'addit':159 'advertis':200 'ai/ml':55 'amount':89,124 'analyt':54 'api':51,129,145,208 'assess':219 'balanc':3,16,33,176 'base':8,21,68,96,102,211 'base-network' 'behind':82,193 'broader':44 'call':92 'caller':120 'categori':59 'challeng':86,188 'check':1,14 'confirm':182 'connect':154 'contain':178 'content':160 'crypto payment API' 'data':53,226 'decim':110 'descript':172 'detail':171 'difficult':217 'doc':144 'document':136,214 'endpoint':28,74,180 'equal':104 'exact':116 'exampl':168 'extrem':141 'fee':206 'finance/web3':56 'fix':123 'function':192 'gate':81 'id':37 'inform':34 'infrastructur':58 'key':130 'keyless':207 'limit':132 'live':183 'low':205 'low-fe':204 'lowpaymentfee' 'lowpaymentfee.com':30 'made':113 'maximum':88 'mean':118 'micropay':6,19 'micropayment API' 'network':9,22,69 'no-api-key' 'offer':46,203 'openapi':164 'page':149 'part':41 'pay':48,121 'pay-per-request':47 'payment':85,111 'paywal':195 'per':12,25,49,91,125 'platform':45,199 'post':77 'post-method' 'price':146 'prompt':156 'proper':186 'protocol':65 'qualiti':221 'rate':131 'readm':148 'render':151 'request':13,26,50,78,126 'request/response':167 'requir':90,135 'respons':177 'return':31,184,227 'schema':165 'scheme':117 'settl':61 'site':139 'spars':142 'specif':73 'structur':223 'subscript':134 'undocu':197 'unit':97 'usd':106 'usdc':71,99,107 'usdc-settlement' 'use':70,108 'via':4,17,62,114 'wallet':155 'without':213 'x402':5,18,64,84 'x402 API' 'x402-payment'","prices":[{"id":"f67e3940-007a-4e06-b40d-e5991b8d3601","listingId":"da7d8c9e-2f46-41f7-b426-d9b57133d6d8","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/158/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":"2026-04-18T18:41:14.512Z"}],"sources":[{"listingId":"da7d8c9e-2f46-41f7-b426-d9b57133d6d8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/158/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:14.512Z","lastSeenAt":"2026-04-27T20:34:32.465Z"}],"details":{"listingId":"da7d8c9e-2f46-41f7-b426-d9b57133d6d8","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Without payment, it returns 402 with the challenge.\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/158/balance \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/accounts/158/balance"},{"claim":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/158/balance"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data without needing API keys or subscriptions","Demonstrating x402 protocol micropayment flows on Base","Integrating pay-per-request balance checks into automated agent workflows"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Low-volume balance lookups where subscription pricing is unnecessary"],"notFor":["High-volume balance queries where per-request fees add up","Users who need detailed API documentation and response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.747Z"},"updatedAt":"2026-04-27T20:34:32.465Z"}}