{"id":"ee3bdcb0-dbcd-454a-932b-556a1c2c13e8","shortId":"xVQm8p","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 177) via an x402-gated API call. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — access is granted by attaching an x402 payment header to each request.\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 use the same x402 payment scheme on Base.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the balance endpoint returns or what input parameters it accepts beyond the POST method. The endpoint is confirmed live (returns a proper 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","x402 balance check","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or output schema provided; response format is unknown","No request body schema documented; unclear what parameters the POST endpoint accepts","Account ID 177 is hardcoded in the URL — unclear if this is a demo or a real account endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/177/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/177/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 402 challenge, confirming it exists and accepts payment. However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the actual functionality of this specific balance endpoint is undocumented. The listing is effectively a 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'000':63 '177':41 '20':62 '402':204 '6':67 'Base network API' 'USDC micropayment API' 'accept':191 'access':77 'account':2,15,32,38,39 'account balance API' 'account-balance' 'actual':208 'ai/ml':105 'analysi':108 'analyt':104 'api':47,70,101,153 'attach':81 'balanc':3,16,33,183 'base':8,21,56,64,145 'beyond':192 'broader':94 'call':48,100 'challeng':205 'check':1,14 'classif':110 'confirm':199 'connect':161 'content':167 'convers':127 'data':103 'decim':68 'descript':179 'detail':178 'doc':151 'document':146 'embed':111 'endpoint':28,130,184,197 'estim':121 'exampl':175 'exchang':116 'extrem':148 'feed':115 'financ':112 'format':212 'function':209 'gas':120 'gate':46 'generat':128 'geocod':125 'grant':79 'header':85 'host':92 'id':40 'infer':106 'inform':34 'infrastructur':123 'input':188 'key':71 'limit':74 'list':132 'live':200 'lowpaymentfee' 'lowpaymentfee.com':30,91 'method':195 'micropay':6,19 'network':9,22,57 'no-api-key' 'openapi':171 'page':156 'paramet':189 'pay':98 'pay-per-cal':97 'pay-per-call balance' 'pay-per-request' 'payment':49,84,142 'per':12,25,60,99,135 'post':194 'price':114,152 'prompt':163 'proper':203 'provid':90 'quot':119 'rate':73,117 'readm':155 'remain':213 'render':158 'request':13,26,61,88,136 'request/response':174 'requir':76 'respons':211 'return':31,185,201 'schema':172 'scheme':143 'sentiment':107 'settl':51 'span':102 'spars':149 'specif':37 'suit':95 'summar':109 'token':118 'unclear':214 'unit':65 'usdc':53 'usdc-base' 'use':138 'util':124 'valid':126 'via':4,17,42 'wallet':162 'web3':113 'x402':5,18,45,83,141 'x402 balance check' 'x402-gated':44 'x402-payment'","prices":[{"id":"49bada46-8801-43d3-b9a3-5c569e1e06db","listingId":"ee3bdcb0-dbcd-454a-932b-556a1c2c13e8","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/177/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":"2026-04-18T18:41:31.306Z"}],"sources":[{"listingId":"ee3bdcb0-dbcd-454a-932b-556a1c2c13e8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/177/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:31.306Z","lastSeenAt":"2026-04-30T11:03:55.550Z"}],"details":{"listingId":"ee3bdcb0-dbcd-454a-932b-556a1c2c13e8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/177/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 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/177/balance"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/accounts/177/balance"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance information programmatically with per-request USDC payment","Integrating balance checks into agent workflows without managing API keys","Demonstrating x402 payment protocol usage on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing key-free, pay-per-call account balance lookups","Low-volume balance queries where subscription APIs are overkill"],"notFor":["High-volume balance monitoring requiring bulk or subscription pricing","Users who need detailed API documentation or guaranteed SLAs","Production systems requiring well-documented response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.977Z"},"updatedAt":"2026-04-30T11:03:55.550Z"}}