{"id":"e0bb3ecd-73e6-4335-b30e-6fd3a6ac20ed","shortId":"MDFFMj","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 84. It is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request.\n\nThe specific endpoint `/api/v1/accounts/84/balance` is labeled \"Premium API Access\" and accepts POST requests. Payment is handled via the X-PAYMENT header using the x402 exact scheme. The platform advertises no API keys, no rate limits, and instant access — you pay per call with USDC and receive a JSON response. The x402 challenge was successfully captured, confirming the endpoint is live.\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 technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact structure of the balance response and what input parameters (if any) the POST body expects are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","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 spec or schema documentation available","Docs, API, pricing, and README pages all render only 'Connect wallet' with no content","No request body schema or response schema documented — input/output format is unknown","The endpoint path includes a hardcoded account ID (84); unclear if this is parameterizable","Platform appears to be a demo or early-stage project with many listed endpoints but no substantive documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/84/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/84/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty stubs. The purpose of this specific endpoint (account 84 balance) is vague with no context on what 'account' refers 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'0.02':11,24,82 '84':38 'Base network API' 'USDC micropayment API' 'accept':95 'access':93,123 'account':2,15,32,36 'account balance API' 'account-balance' 'addit':169 'advertis':114 'ai/ml':57 'analyt':56 'api':53,92,116,155 'avail':185 'balanc':3,16,33,191 'base':8,21,79 'bodi':201 'broader':44 'call':52,127 'captur':140 'challeng':137 'check':1,14 'confirm':141 'connect':164 'crypto':60 'data':55 'detail':171 'doc':154 'document':146,180 'dozen':47 'endpoint':28,65,87,143 'exact':110,187 'exampl':183 'expect':202 'extrem':151 'financ':59 'handl':100 'header':106 'id':37 'infer':58 'inform':34 'input':195 'instant':122 'json':133 'key':117 'label':90 'limit':120 'live':145 'lowpaymentfee' 'lowpaymentfee.com':30 'micropay':6,19 'network':9,22,80 'no-api-key' 'offer':46 'openapi':175 'page':159 'paramet':196 'part':41 'pay':50,125 'pay-per-cal':49 'pay-per-call balance' 'pay-per-request' 'payload':184 'payment':72,98,105 'per':12,25,51,83,126 'platform':45,68,113 'post':96,200 'premium':91 'price':156 'prompt':166 'protocol':73 'rate':119 'readm':158 'receiv':131 'render':161 'request':13,26,84,97 'request/response':178 'respons':134,192 'return':31 'schema':179 'scheme':111 'servic':63 'settl':74 'site':149 'span':54 'spars':152 'spec':176 'specif':86 'structur':188 'success':139 'technic':170 'unknown':204 'usdc':76,129 'usdc-base-network' 'use':69,107 'util':62 'via':4,17,101 'wallet':165 'x':104 'x-payment':103 'x402':5,18,71,109,136 'x402 balance check' 'x402-payment'","prices":[{"id":"95b17ff2-f6d8-457b-aeda-af31f81d9a05","listingId":"e0bb3ecd-73e6-4335-b30e-6fd3a6ac20ed","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/84/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":"2026-04-18T18:40:13.380Z"}],"sources":[{"listingId":"e0bb3ecd-73e6-4335-b30e-6fd3a6ac20ed","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/84/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:13.380Z","lastSeenAt":"2026-04-30T22:04:55.434Z"}],"details":{"listingId":"e0bb3ecd-73e6-4335-b30e-6fd3a6ac20ed","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/84/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":"Endpoint returns 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/accounts/84/balance"},{"claim":"Price is $0.02 per request, paid in USDC on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/accounts/84/balance"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data programmatically with per-call USDC payment","Integrating balance checks into agent workflows without API key management","Demonstrating x402 protocol micropayments on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call account balance lookups","Projects already using USDC on Base network"],"notFor":["Production use requiring documented request/response schemas","High-volume balance queries where per-call pricing adds up","Users who need fiat payment options or non-crypto settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.753Z"},"updatedAt":"2026-04-30T22:04:55.434Z"}}