{"id":"96e0d0a2-83fc-48cb-b15e-e4f3a19d630d","shortId":"KjDLvb","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 a specific account (account ID 102) behind an x402 paywall. It is part of a broader platform offering numerous pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/102/balance` accepts POST requests and is gated by the x402 protocol (version 1, \"exact\" scheme). The payment challenge requires up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through per-request micropayment.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the balance response contains or what request body (if any) is expected. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but the actual functionality and response format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request body and response format are completely unknown","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content","The specific purpose of 'account 102 balance' is unclear — it may be a demo or placeholder endpoint","No examples of successful responses exist in the crawl material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/102/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/102/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 x402 challenge, but there is zero documentation on request body format, response schema, or what 'account balance' actually returns. Docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'0.02':11,24,73,120 '000':109 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':131 '0x8335':114 '1':99 '102':41 '20':108 '2913':115 '300':134 '402':208 '6':124 'Base network API' 'USDC micropayment API' 'accept':88 'access':145 'account':2,15,32,38,39 'account balance API' 'account-balance' 'actual':216 'address':130 'advertis':144 'ai/ml':63 'analyt':62 'api':59,138,162 'balanc':3,16,33,191 'base':8,21,82,110,117 'behind':42 'bodi':197 'broader':51 'call':58 'challeng':104,213 'check':1,14 'confirm':205 'connect':168 'contain':193 'data':61,66 'decim':125 'descript':186 'detail':175 'doc':159 'document':154 'endpoint':28,86,203 'equal':119 'exact':100 'exampl':183 'expect':201 'extrem':156 'field':189 'finance/web3':65 'format':220 'function':217 'gate':93 'given':121 'grant':147 'id':40 'infer':64 'inform':34 'infrastructur':68 'key':139 'limit':142 'live':206 'lowpaymentfee' 'lowpaymentfee.com':30 'micropay':6,19,153 'network':9,22,83 'no-api-key' 'numer':54 'offer':53 'openapi':179 'page':163 'part':48 'pay':56 'pay-per-cal':55 'pay-per-call balance' 'pay-per-request' 'payment':103,126 'paywal':45 'per':12,25,57,74,151 'per-request':150 'platform':52 'post':89 'price':71,160 'prompt':170 'protocol':97 'pure':148 'rate':141 'remain':221 'render':165 'request':13,26,75,90,152,196 'request/response':182 'requir':105 'respons':192,219 'return':31,207 'schema':180 'scheme':101 'second':135 'sent':128 'settl':77 'span':60 'spars':157 'specif':37,85 'technic':174 'timeout':136 'unit':111 'unknown':222 'usdc':79,113,122 'usdc-base' 'util':69 'valid':211 'version':98 'via':4,17 'wallet':169 'x402':5,18,44,96,212 'x402 balance check' 'x402-payment'","prices":[{"id":"7843b69b-141c-43d2-bac4-71572b72d667","listingId":"96e0d0a2-83fc-48cb-b15e-e4f3a19d630d","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/102/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":"2026-04-18T18:40:35.885Z"}],"sources":[{"listingId":"96e0d0a2-83fc-48cb-b15e-e4f3a19d630d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/102/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:35.885Z","lastSeenAt":"2026-04-30T19:03:48.657Z"}],"details":{"listingId":"96e0d0a2-83fc-48cb-b15e-e4f3a19d630d","quickStartSnippet":"# 1. Send a POST to the endpoint — you'll get a 402 with payment details\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/102/balance\n# 2. Parse the 402 JSON challenge, construct an x402 payment header\n#    using USDC on Base (max 20000 base units = $0.02), then retry:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/102/balance \\\n  -H \"X-PAYMENT: <signed-x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 v1 challenge requiring up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/102/balance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/102/balance"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data with per-request USDC micropayments","Integrating balance checks into agent workflows without API key management","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents needing keyless, pay-per-call account balance lookups","Projects already operating on the Base L2 network with USDC"],"notFor":["Production use cases requiring documented request/response schemas","High-volume balance queries where per-call pricing is inefficient","Users who need fiat payment rails or non-crypto settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.683Z"},"updatedAt":"2026-04-30T19:03:48.657Z"}}