{"id":"a5f93377-6d08-4981-b10c-d571dec3888b","shortId":"Q3dvtG","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 provides account balance information behind an x402 paywall. The specific resource `/api/v1/accounts/168/balance` accepts POST requests and returns JSON. 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 per-request via the x402 payment protocol.\n\nThe provider lowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text 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 with the same x402/USDC-on-Base payment model.\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 fields the balance endpoint accepts or returns. The endpoint is confirmed live (returns a proper 402 challenge), but the actual functionality behind the paywall is unverifiable from public materials alone.","tags":[],"capabilities":["x402-payment","usdc-base-network","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["No OpenAPI schema or request/response documentation available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The specific meaning of 'accounts/168/balance' is unclear — it is unknown what account or balance type this refers to","Functionality behind the paywall cannot be verified without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/168/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/168/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, but there is zero documentation on request parameters, response schema, or what 'account 168 balance' actually represents. Docs pages are empty beyond a wallet-connect prompt. Without any schema, examples, or functional description, this is effectively a stub 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'0.02':11,24,59,140 '000':63 '20':62 '402':200 '6':67 'Base network API' 'USDC micropayment API' 'accept':43,189 'access':77 'account':2,15,32 'account balance API' 'account-balance' 'actual':204 'ai':109 'alon':214 'analysi':113 'analyt':103 'api':70,100,155 'balanc':3,16,33,187 'base':8,21,56,64 'behind':35,206 'broader':93 'call':61,99 'challeng':201 'check':1,14 'classif':116 'confirm':195 'connect':164 'convers':133 'data':102,106 'decim':68 'descript':182 'detail':171 'doc':154 'document':149 'embed':117 'endpoint':28,136,188,193 'estim':127 'exampl':179 'exchang':122 'export':107 'extrem':151 'feed':121 'field':185 'financ':118 'function':205 'gas':126 'generat':134 'geocod':131 'grant':79 'host':91 'inform':34 'infrastructur':129 'insight':108 'json':48 'json-response' 'key':71 'learn':111 'limit':74 'list':138 'live':196 'lowpaymentfee' 'lowpaymentfee.com':30,90 'machin':110 'materi':213 'metric':104 'micropay':6,19 'model':148 'network':9,22,57 'no-api-key' 'openapi':175 'page':159 'pay':97 'pay-per-cal':96 'pay-per-call balance' 'pay-per-request' 'payment':49,86,147 'paywal':38,208 'per':12,25,60,81,98,141 'per-request':80 'post':44 'price':120,156 'prompt':166 'proper':199 'protocol':87 'provid':31,89 'public':212 'quot':125 'rate':73,123 'readm':158 'render':161 'report':105 'request':13,26,45,82,142 'request/response':178 'requir':76 'resourc':41 'return':47,191,197 'schema':176 'sentiment':112 'settl':51 'span':101 'spars':152 'specif':40 'suit':94 'summar':115 'technic':170 'text':114 'token':124 'unit':65 'unverifi':210 'usdc':53 'usdc-base-network' 'util':130 'valid':132 'via':4,17,83 'wallet':165 'web3':119 'x402':5,18,37,85 'x402 balance check' 'x402-payment' 'x402/usdc-on-base':146","prices":[{"id":"0f251b21-1e1d-4cc3-9c1d-35a965bd17f4","listingId":"a5f93377-6d08-4981-b10c-d571dec3888b","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/168/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":"2026-04-18T18:41:25.918Z"}],"sources":[{"listingId":"a5f93377-6d08-4981-b10c-d571dec3888b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/168/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:25.918Z","lastSeenAt":"2026-04-29T02:33:51.260Z"}],"details":{"listingId":"a5f93377-6d08-4981-b10c-d571dec3888b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/168/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":"Endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/168/balance"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/accounts/168/balance"},{"claim":"Provider lists all APIs at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data without needing API key registration","Programmatic balance lookups settled instantly via USDC on Base","Agent-driven financial data retrieval using x402 micropayments"],"bestFor":["Developers wanting zero-signup API access to balance data","AI agents that can settle x402 payments autonomously","Users who prefer per-request pricing over subscriptions"],"notFor":["Users needing detailed API documentation or schema guarantees before paying","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.263Z"},"updatedAt":"2026-04-29T02:33:51.260Z"}}