{"id":"f20b4659-f183-4371-926e-b6b0e16f6e1b","shortId":"nzTQpH","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/90/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 purely through the x402 payment protocol.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with the same x402 payment model on Base. However, the specific endpoint being listed here is the account balance lookup at `/api/v1/accounts/90/balance`.\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 response contains or what parameters the POST body expects. The endpoint is confirmed live (returns a valid x402 402 challenge), but the actual functionality and response format remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["account balance API","balance check","x402 API","micropayment API","USDC pay-per-call","lowpaymentfee"],"warnings":["No OpenAPI schema or request/response documentation available","Docs, API, pricing, and README pages all render only 'Connect wallet' with no technical content","The purpose and response format of /api/v1/accounts/90/balance is not documented anywhere","The hardcoded account ID '90' in the path suggests this may be a demo or placeholder endpoint","Cannot verify what data is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/90/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/90/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and no meaningful documentation beyond a landing page listing. The actual functionality of this specific endpoint (account balance for account 90) is unexplained. This is effectively a stub 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'0.02':11,24,59,126 '000':63 '20':62 '402':208 '6':67 'USDC pay-per-call' 'accept':43 'access':77 'account':2,15,32,146 'account balance API' 'account-balance' 'actual':212 'advertis':90 'ai/ml':102 'analysi':105 'analyt':101 'api':70,98,157 'balanc':3,16,33,147,189 'balance check' 'base':8,21,56,64,136 'behind':35 'bodi':197 'broader':87 'call':61,97 'challeng':209 'check':1,14 'classif':107 'confirm':202 'connect':166 'contain':191 'convers':119 'crypto':111 'data':100,113 'decim':68 'descript':184 'detail':173 'doc':156 'document':151 'embed':108 'endpoint':28,122,140,200 'exampl':181 'expect':198 'extrem':153 'field':187 'financ':109 'format':216 'function':213 'generat':120 'geocod':117 'grant':79 'howev':137 'infer':103 'inform':34 'infrastructur':115 'json':48 'key':71 'limit':74 'list':124,142 'live':203 'lookup':148 'lowpaymentfee' 'lowpaymentfee.com':30,88 'market':112 'micropay':6,19 'micropayment API' 'model':134 'network':9,22,57 'no-api-key' 'openapi':177 'page':161 'paramet':194 'pay':95 'pay-per-cal':94 'pay-per-request' 'payment':49,84,133 'paywal':38 'per':12,25,60,96,127 'platform':89 'post':44,196 'price':158 'prompt':168 'protocol':85 'provid':31 'pure':80 'rate':73 'readm':160 'remain':217 'render':163 'request':13,26,45,128 'request/response':180 'requir':76 'resourc':41 'respons':190,215 'return':47,204 'schema':178 'sentiment':104 'settl':51 'span':99 'spars':154 'specif':40,139 'suit':92 'summar':106 'technic':172 'unclear':218 'unit':65 'usdc':53 'usdc-base' 'util':116 'valid':118,206 'via':4,17 'wallet':167 'x402':5,18,37,83,132,207 'x402 API' 'x402-payment'","prices":[{"id":"5a810046-24b6-4321-ba33-37b0da6a775b","listingId":"f20b4659-f183-4371-926e-b6b0e16f6e1b","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/90/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":"2026-04-18T18:40:18.899Z"}],"sources":[{"listingId":"f20b4659-f183-4371-926e-b6b0e16f6e1b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/90/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:18.899Z","lastSeenAt":"2026-04-30T22:04:55.700Z"}],"details":{"listingId":"f20b4659-f183-4371-926e-b6b0e16f6e1b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/90/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 x402 402 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/90/balance"},{"claim":"All APIs listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/90/balance"}],"useCases":["Querying account balance data programmatically with per-call USDC payment","Integrating balance lookups into agent workflows without managing API keys","Demonstrating x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that need keyless, pay-per-call API access on Base","Quick balance lookups without subscription commitments"],"notFor":["Production systems requiring well-documented, schema-validated APIs","High-volume balance queries where per-call pricing adds up","Users who need detailed documentation or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.514Z"},"updatedAt":"2026-04-30T22:04:55.700Z"}}