{"id":"6da93876-5d65-481d-b74a-3d9afea9c1fc","shortId":"4WCy8Y","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 142) via an x402-gated POST request. Payment is settled in USDC on the Base network at $0.02 per call (20,000 base units with 6 decimals). No API keys or rate limits are required — access is granted purely through the x402 payment protocol.\n\nThe provider lowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request and settle on the Base network using USDC.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the balance response payload looks like. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual functionality and response format must be inferred from the endpoint path alone.","tags":[],"capabilities":["x402-payment","usdc-base-network","account-balance","pay-per-request","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee API","crypto payment API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or output schema provided; response format is completely unknown","The specific endpoint path (/accounts/142/balance) suggests a hardcoded account ID with unclear general utility","Provider hosts many listed endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/142/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/142/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 and returns a valid x402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The actual response payload and input parameters are 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'000':62 '142':40 '20':61 '402':190 '6':66 'Base network API' 'USDC micropayment API' 'access':76 'account':2,15,32,38 'account balance API' 'account-balance' 'actual':195 'ai/ml':101 'alon':207 'analysi':104 'analyt':100 'api':69,97,146 'balanc':3,16,33,177 'base':8,21,55,63,136 'broader':90 'call':60,96 'challeng':192 'check':1,14 'classif':106 'confirm':185 'connect':155 'convers':122 'crypto payment API' 'data':99 'decim':67 'descript':173 'detail':162 'doc':145 'document':140 'embed':107 'endpoint':28,125,183,205 'estim':116 'exampl':170 'exchang':111 'extrem':142 'feed':110 'finance/web3':108 'format':199 'function':196 'gas':115 'gate':45 'generat':123 'geocod':120 'grant':78 'host':88 'id':39 'infer':102,202 'inform':34 'infrastructur':118 'key':70 'like':181 'limit':73 'list':127 'live':186 'look':180 'lowpaymentfee API' 'lowpaymentfee.com':30,87 'micropay':6,19 'must':200 'network':9,22,56,137 'no-api-key' 'no-rate-limit' 'openapi':166 'page':150 'path':206 'pay':94 'pay-per-cal':93 'pay-per-call balance' 'pay-per-request' 'payload':179 'payment':48,83 'per':12,25,59,95,130 'post':46 'price':109,147 'prompt':157 'proper':189 'protocol':84 'provid':86 'pure':79 'quot':114 'rate':72,112 'readm':149 'render':152 'request':13,26,47,131 'request/response':169 'requir':75 'respons':178,198 'return':31,187 'schema':167 'sentiment':103 'settl':50,133 'span':98 'spars':143 'specif':37 'suit':91 'summar':105 'technic':161 'token':113 'unit':64 'usdc':52,139 'usdc-base-network' 'use':138 'util':119 'valid':121 'via':4,17,41 'wallet':156 'x402':5,18,44,82,191 'x402 balance check' 'x402-gated':43 'x402-payment'","prices":[{"id":"8c818612-6821-49c0-addf-65c8704718c9","listingId":"6da93876-5d65-481d-b74a-3d9afea9c1fc","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/142/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":"2026-04-18T18:41:05.388Z"}],"sources":[{"listingId":"6da93876-5d65-481d-b74a-3d9afea9c1fc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/142/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:05.388Z","lastSeenAt":"2026-04-29T03:04:50.821Z"}],"details":{"listingId":"6da93876-5d65-481d-b74a-3d9afea9c1fc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/142/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 requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/142/balance"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/accounts/142/balance"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance information programmatically via micropayment","Integrating balance checks into agent workflows without API key management","Demonstrating x402 payment protocol usage on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call account balance lookups","Low-volume balance queries where $0.02/request is acceptable"],"notFor":["High-volume balance monitoring requiring bulk/subscription pricing","Users needing detailed API documentation or guaranteed SLAs","Production systems requiring well-documented response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.244Z"},"updatedAt":"2026-04-29T03:04:50.821Z"}}