{"id":"a15ca217-3446-4af3-8471-e08154ca3649","shortId":"xLnqMB","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 146) 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/146/balance` accepts POST requests and charges a maximum of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. Payment is made via the x402 protocol: callers include an X-PAYMENT header with a signed payment proof, and the server verifies it before returning the JSON response. No API keys, rate limits, or upfront commitments are required — access is instant once payment is attached.\n\nThe platform's landing page lists additional endpoint categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more, all at the same $0.02 price point. Documentation pages beyond the landing page appear to require a wallet connection and were not crawlable, so detailed request/response schemas for this specific balance endpoint are not available.","tags":[],"capabilities":["x402-payment","usdc-base-network","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","lowpaymentfee","pay-per-call API","Base network API","crypto payment API"],"warnings":["No request or response schema available — the endpoint's actual data output is unknown","Documentation pages require wallet connection and could not be crawled","The specific meaning of 'account 146 balance' is unclear — it may be a demo or placeholder endpoint","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/146/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/146/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation on request parameters, response schema, or what 'account 146 balance' actually represents. The docs, API, pricing, and README pages all returned only a 'Connect wallet' prompt with no useful content. This is effectively a stub 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'0.02':11,24,74,103,106,182 '000':98 '146':41 '20':97 'Base network API' 'USDC micropayment API' 'accept':89 'access':148 'account':2,15,32,38,39 'account balance API' 'account-balance' 'addit':161 'ai/ml':64 'analysi':166 'analyt':63 'api':60,139 'appear':191 'attach':154 'avail':212 'balanc':3,16,33,208 'base':8,21,83,99 'behind':42 'beyond':187 'broader':51 'call':59,108 'caller':116 'categori':163 'charg':93 'check':1,14 'classif':169 'commit':145 'connect':196 'crawlabl':200 'crypto payment API' 'data':62,67 'detail':202 'document':185 'dozen':54 'embed':170 'endpoint':28,87,162,209 'exchang':173 'feed':172 'finance/web3':66 'geocod':175 'header':122 'i.e':105 'id':40 'includ':117,164 'infer':65 'inform':34 'infrastructur':69 'instant':150 'json':136 'json-response' 'key':140 'land':158,189 'limit':142 'list':160 'lowpaymentfee' 'lowpaymentfee.com':30 'made':111 'maximum':95 'micropay':6,19 'network':9,22,84 'no-api-key' 'offer':53 'page':159,186,190 'part':48 'pay':57 'pay-per-cal':56 'pay-per-call API' 'pay-per-request' 'payment':109,121,126,152 'paywal':45 'per':12,25,58,75,107 'platform':52,156 'point':184 'post':90 'price':72,171,183 'proof':127 'protocol':115 'rate':141,174 'request':13,26,76,91 'request/response':203 'requir':147,193 'respons':137 'return':31,134 'schema':204 'sentiment':165 'server':130 'settl':78 'sign':125 'span':61 'specif':37,86,207 'summar':168 'text':167 'unit':100 'upfront':144 'usdc':80,102,104 'usdc-base-network' 'util':70 'verifi':131 'via':4,17,112 'wallet':195 'x':120 'x-payment':119 'x402':5,18,44,114 'x402 balance check' 'x402-payment'","prices":[{"id":"17812e14-06f6-47d8-b100-cf2b9dcfc11a","listingId":"a15ca217-3446-4af3-8471-e08154ca3649","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/146/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":"2026-04-18T18:41:04.170Z"}],"sources":[{"listingId":"a15ca217-3446-4af3-8471-e08154ca3649","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/146/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:04.170Z","lastSeenAt":"2026-04-27T20:34:31.961Z"}],"details":{"listingId":"a15ca217-3446-4af3-8471-e08154ca3649","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/146/balance \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 HTTP 402 with an x402 challenge requiring 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/146/balance"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/146/balance"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data programmatically with per-request USDC micropayments","Integrating balance lookups into agent workflows without managing API keys","Demonstrating x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 pay-per-call APIs","Agents that need on-demand account balance data without subscription overhead","Projects already using USDC on Base that want frictionless API access"],"notFor":["High-volume balance polling where $0.02/request adds up quickly","Users who need detailed API documentation or response schemas before integrating","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.265Z"},"updatedAt":"2026-04-27T20:34:31.961Z"}}