{"id":"b8240edc-2dde-47fc-8a1a-5b941e04e623","shortId":"bXR9eJ","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 (ID 129) behind an x402 paywall. It is part of a broader platform offering dozens of 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/129/balance` accepts POST requests and is gated by the x402 protocol (version 1, scheme \"exact\"). 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 instant once payment is included in the X-PAYMENT header.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but the actual response format and the meaning of \"account 129 balance\" are unknown from the available material.","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 documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific meaning of 'accounts/129/balance' is unknown — it is unclear whether this is a demo, a user-specific resource, or a generic endpoint","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/129/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/129/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 documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what 'accounts/129/balance' actually returns. The listing is a stub with pricing and liveness confirmed but nothing 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'0.02':11,24,73,120 '000':109 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':131 '0x8335':114 '1':99 '129':40,216 '20':108 '2913':115 '300':134 '402':200 '6':124 'Base network API' 'USDC micropayment API' 'accept':88 'access':145 'account':2,15,32,38,215 'account balance API' 'account-balance' 'actual':208 'addit':178 'address':130 'advertis':144 'ai/ml':63 'analyt':62 'api':59,138,164 'avail':193,222 'balanc':3,16,33,217 'base':8,21,82,110,117 'behind':41 'broader':50 'call':58 'challeng':104,205 'check':1,14 'confirm':197 'connect':173 'data':61,66 'decim':125 'detail':180 'doc':163 'document':158 'dozen':53 'endpoint':28,86,195 'equal':119 'exact':101 'exampl':191 'extrem':160 'finance/web3':65 'format':210 'gate':93 'given':121 'header':157 'id':39 'includ':151 'infer':64 'inform':34 'infrastructur':68 'instant':147 'key':139 'limit':142 'live':198 'lowpaymentfee' 'lowpaymentfee.com':30 'materi':223 'mean':213 'micropay':6,19 'network':9,22,83 'no-api-key' 'offer':52 'openapi':184 'page':168 'part':47 'pay':56 'pay-per-cal':55 'pay-per-call balance' 'pay-per-request' 'payload':192 'payment':103,126,149,156 'paywal':44 'per':12,25,57,74 'platform':51 'post':89 'price':71,165 'prompt':175 'protocol':97 'rate':141 'readm':167 'render':170 'request':13,26,75,90 'request/response':187 'requir':105 'respons':209 'return':31,199 'schema':188 'scheme':100 'second':135 'sent':128 'settl':77 'span':60 'spars':161 'spec':185 'specif':37,85 'technic':179 'timeout':136 'unit':111 'unknown':219 'usdc':79,113,122 'usdc-base' 'util':69 'valid':203 'version':98 'via':4,17 'wallet':174 'x':155 'x-payment':154 'x402':5,18,43,96,204 'x402 balance check' 'x402-payment'","prices":[{"id":"3b6562fa-3383-4f96-80ae-0f8cdf6a2daa","listingId":"b8240edc-2dde-47fc-8a1a-5b941e04e623","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/129/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":"2026-04-18T18:40:56.952Z"}],"sources":[{"listingId":"b8240edc-2dde-47fc-8a1a-5b941e04e623","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/129/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:56.952Z","lastSeenAt":"2026-04-30T16:04:07.517Z"}],"details":{"listingId":"b8240edc-2dde-47fc-8a1a-5b941e04e623","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/129/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 a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/129/balance"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/129/balance"}],"useCases":["Querying account balance data with per-request USDC micropayments","Integrating pay-as-you-go balance lookups into agent workflows","Accessing financial account information without API key registration"],"bestFor":["Agents or apps that need on-demand account balance data without subscription commitments","Developers experimenting with x402 protocol micropayments on Base","Scenarios requiring keyless, instant API access paid in USDC"],"notFor":["High-volume balance polling where per-request fees would accumulate quickly","Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.607Z"},"updatedAt":"2026-04-30T16:04:07.517Z"}}