{"id":"aa8a8094-3ad4-471d-bdd6-79e4e105a10a","shortId":"U2XbTQ","kind":"x402","title":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides an account balance lookup (account ID 82) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per call, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/82/balance` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requiring a maximum payment of 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 using the \"exact\" scheme with a 300-second timeout.\n\nDocumentation is extremely sparse — the docs, API, pricing, 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 outputSchema stub, and no explanation of what fields the balance response contains or what input parameters the POST body expects. The platform advertises no API keys, no rate limits, and instant access, but specifics about the data returned by this particular endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance endpoint","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown","All doc/pricing/README pages render only 'Connect wallet' with no content","The endpoint path references a hardcoded account ID (82); unclear if this is parameterizable","No information on what 'balance' data is returned or its format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/82/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/82/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, and all documentation pages return only a wallet-connect prompt. The purpose of this specific endpoint (account 82 balance) is unexplained, making integration 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'0.02':10,24,75,120 '000':109 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':131 '0x8335':114 '20':108 '2913':115 '300':138 '6':124 '82':40 'Base network API' 'USDC micropayment API' 'accept':89 'access':205 'account':4,18,35,38 'account balance API' 'account-balance' 'address':130 'advertis':196 'ai/ml':65 'analyt':64 'api':61,147,198 'balanc':5,19,36,183 'base':8,22,83,110,117 'base-network' 'behind':41 'beyond':171 'bodi':192 'broader':50 'call':77 'challeng':97 'confirm':98 'connect':156 'contain':185 'content':162 'crypto payment API' 'data':63,68,210 'decim':125 'doc':146 'document':141 'endpoint':6,20,30,87,100,215 'equal':119 'exact':134 'expect':193 'explan':178 'extrem':143 'field':181 'finance/web3':67 'gate':3,17 'given':121 'id':39 'infer':66 'input':188 'instant':204 'json':94 'key':199 'limit':202 'live':102 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':105 'network':84 'no-api-key' 'offer':53 'openapi':166 'outputschema':174 'page':151 'paramet':189 'part':47 'particular':214 'pay':9,23,58 'pay-per-call API' 'pay-per-request':57 'payment':106,126 'paywal':44 'per':11,25,59,76 'platform':51,195 'post':90,191 'price':73,148 'prompt':158 'provid':33 'rate':201 'readm':150 'render':153 'request':12,26,60,91 'request/response':169 'requir':103 'respons':184 'return':93,211 'schema':170 'scheme':135 'second':139 'sent':128 'servic':71 'settl':78 'span':62 'spars':144 'spec':167 'specif':86,207 'stub':175 'substant':161 'timeout':140 'unit':111 'unknown':217 'usdc':14,28,80,113,122 'usdc-settlement' 'use':132 'util':70 'varieti':55 'wallet':157 'x402':2,16,43,96,173 'x402 balance endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ead92955-1575-4b08-ac26-ddfa67de933c","listingId":"aa8a8094-3ad4-471d-bdd6-79e4e105a10a","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/82/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":"2026-04-18T18:40:11.538Z"}],"sources":[{"listingId":"aa8a8094-3ad4-471d-bdd6-79e4e105a10a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/82/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:11.538Z","lastSeenAt":"2026-04-28T03:33:09.464Z"}],"details":{"listingId":"aa8a8094-3ad4-471d-bdd6-79e4e105a10a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/82/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/accounts/82/balance"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data with per-request USDC micropayments","Integrating pay-as-you-go balance lookups into agent workflows","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing on-demand balance data without API key management","Low-volume, pay-per-use account queries"],"notFor":["High-volume balance polling where per-request fees add up","Users who need detailed API documentation before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.822Z"},"updatedAt":"2026-04-28T03:33:09.464Z"}}