{"id":"f2558766-f8db-4f45-b721-a6031830ba72","shortId":"M93kaj","kind":"x402","title":"x402-gated account balance endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated account balance endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides account balance information via the x402 payment protocol. The specific resource `/api/v1/accounts/121/balance` is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the `exact` scheme to a specified wallet address, with the asset being USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The max amount required is 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access.\n\nHowever, documentation 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 schema, no request/response examples, and no description of what the balance endpoint actually returns or what input parameters it expects. The endpoint path suggests it retrieves a balance for account ID 121, but the semantics are unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific endpoint path (/api/v1/accounts/121/balance) has a hardcoded account ID; unclear if this is parameterizable","The platform lists many endpoint categories (AI, analytics, finance, utils) but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/121/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/121/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 confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet connect prompt. The purpose of the specific account balance endpoint is unclear, making this effectively a stub 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'0.02':10,24,82,136 '000':131 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':122 '121':211 '20':130 '6':139 'Base network API' 'USDC micropayment API' 'accept':101 'access':152 'account':4,18,34,209 'account balance API' 'account-balance' 'actual':192 'address':115 'advertis':143 'ai/ml':70 'amount':127 'analyt':69 'api':66,145,160 'asset':118 'balanc':5,19,35,190,207 'base':8,22,90,124,132 'base-network' 'broad':59 'call':65 'catalog':60 'challeng':94 'confirm':95 'connect':169 'content':175 'contract':121 'data':68,73 'decim':140 'descript':186 'doc':159 'document':154 'endpoint':6,20,30,50,78,97,191,201 'equal':135 'exact':109 'exampl':183 'expect':199 'extrem':156 'finance/web3':72 'gate':3,17 'host':57 'howev':153 'id':210 'infer':71 'inform':36 'input':196 'instant':151 'key':146 'limit':149 'live':99 'lowpaymentfee' 'lowpaymentfee.com':32,54 'made':106 'mani':49 'max':126 'network':91 'no-api-key' 'offer':51 'one':47 'openapi':179 'page':164 'paramet':197 'path':202 'pay':9,23,63 'pay-per-cal':62 'pay-per-call API' 'pay-per-request' 'payment':40,104 'per':11,25,64,83 'platform':55,142 'post':102 'price':80,161 'prompt':171 'protocol':41 'provid':33 'rate':148 'readm':163 'render':166 'request':12,26,84,103 'request/response':182 'requir':128 'resourc':44 'retriev':205 'return':193 'schema':180 'scheme':110 'semant':214 'servic':76 'settl':85 'span':67 'spars':157 'specif':43 'specifi':113 'substant':174 'suggest':203 'unclear':216 'unit':133 'usdc':14,28,87,120,137 'usdc-settlement' 'use':138 'util':75 'via':37,107 'wallet':114,170 'x402':2,16,39,93 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8587a665-e3d6-47d1-bb25-e64d8cb7dcc1","listingId":"f2558766-f8db-4f45-b721-a6031830ba72","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/121/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":"2026-04-18T18:40:52.153Z"}],"sources":[{"listingId":"f2558766-f8db-4f45-b721-a6031830ba72","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/121/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:52.153Z","lastSeenAt":"2026-04-27T22:03:22.909Z"}],"details":{"listingId":"f2558766-f8db-4f45-b721-a6031830ba72","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/121/balance\n# Returns 402 with x402 payment challenge.\n# Include X-PAYMENT header with valid USDC payment proof to receive the response.","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, accepting USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/121/balance"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/121/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 with per-request USDC micropayments","Agent-driven financial data retrieval without API key management","Programmatic access to balance information settled on Base L2"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.91Z"},"updatedAt":"2026-04-27T22:03:22.909Z"}}