{"id":"cbf08b6d-50e5-4492-bda2-a4aff7d99203","shortId":"qcTNzG","kind":"x402","title":"Query API3 token wallet balance on Base via x402 micropayment at $0.02 per request.","tagline":"Query API3 token wallet balance on Base via x402 micropayment at $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns the wallet balance for the API3 token. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories, all settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/wallet/API3/balance` accepts POST requests and charges a maximum of $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is made inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required. The x402 challenge was confirmed live, returning a proper 402 response with version 1 of the protocol.\n\nThe platform advertises a uniform $0.02/request pricing across all its endpoints. Documentation pages (docs, pricing, README) appear to require wallet connection and contain no additional readable content, so details about request/response schemas beyond what the x402 challenge provides are unavailable. The endpoint likely returns a JSON object with the API3 token balance for a specified wallet address, but the exact input parameters and response shape are not documented in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","wallet-balance-query","api3-token","pay-per-request","no-api-key"],"categories":["crypto","finance"],"synonyms":["API3 balance","token balance API","wallet balance check","crypto balance lookup","API3 wallet query","x402 crypto API","Base network balance"],"warnings":["No API documentation available — docs, pricing, and README pages all require wallet connection and return no content.","Request and response schemas are entirely inferred; no OpenAPI or example payloads were found.","The endpoint path suggests API3 token balance but the existing title/description is generic 'Premium API Access' with no specifics."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/API3/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/wallet/API3/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documented request/response format, and all docs pages require wallet connection with no readable content. The request body and response shape are inferred, not 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'/request':140 '0.02':12,26,86,139 '000':90 '1':130 '20':89 '402':126 '6':96 'API3 balance' 'API3 wallet query' 'Base network balance' 'accept':78 'account':111 'across':54,142 'addit':159 'address':191 'advertis':136 'ai/ml':57 'analyt':56 'api':53,109 'api3':2,16,39,184 'api3-token' 'appear':151 'balanc':5,19,36,186 'base':7,21,70,91 'base-network' 'beyond':167 'broader':46 'call':88 'categori':61 'challeng':119,171 'charg':82 'confirm':121 'connect':155 'contain':157 'content':161 'crawl':205 'crypto balance lookup' 'data':55 'decim':97 'detail':163 'doc':148 'document':146,202 'endpoint':30,76,145,176 'exact':194 'finance/web3':58 'header':107 'infrastructur':60 'inlin':101 'input':195 'json':180 'key':110 'like':177 'limit':114 'live':122 'lowpaymentfee.com':32 'made':100 'materi':206 'maximum':84 'micropay':10,24 'network':71 'no-api-key' 'object':181 'offer':48 'page':147 'paramet':196 'part':43 'pay':50 'pay-per-request':49 'payment':98,106 'per':13,27,51,87 'platform':47,135 'post':79 'price':141,149 'proper':125 'protocol':67,133 'provid':172 'queri':1,15 'rate':113 'readabl':160 'readm':150 'request':14,28,52,80 'request/response':165 'requir':116,153 'respons':127,198 'return':33,123,178 'schema':166 'settl':63 'shape':199 'specif':75 'specifi':189 'token':3,17,40,185 'token balance API' 'unavail':174 'uniform':138 'unit':92 'usdc':73,94 'usdc-settlement' 'use':72 'version':129 'via':8,22,64,102 'wallet':4,18,35,154,190 'wallet balance check' 'wallet-balance-query' 'x':105 'x-payment':104 'x402':9,23,66,118,170 'x402 crypto API' 'x402-payment'","prices":[{"id":"8f70870e-9823-4091-891f-666740c9849d","listingId":"cbf08b6d-50e5-4492-bda2-a4aff7d99203","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/wallet/API3/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":"2026-04-18T19:28:13.671Z"}],"sources":[{"listingId":"cbf08b6d-50e5-4492-bda2-a4aff7d99203","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/API3/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:13.671Z","lastSeenAt":"2026-04-23T14:31:41.528Z"}],"details":{"listingId":"cbf08b6d-50e5-4492-bda2-a4aff7d99203","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/API3/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{\"address\": \"0xYourWalletAddress\"}'","exampleRequest":{"address":"0x1234567890abcdef1234567890abcdef12345678"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/API3/balance"},{"claim":"Platform-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/API3/balance"}],"useCases":["Checking API3 token balance for a given wallet address on-chain","Integrating real-time API3 balance data into a portfolio tracker or dashboard","Automated agents querying token holdings as part of a DeFi workflow"],"bestFor":["Developers needing quick, keyless access to API3 token balances","AI agents that can settle x402 micropayments on Base","Applications requiring low-cost, per-request crypto balance lookups"],"notFor":["Bulk historical balance queries across many tokens (single-token endpoint)","Users who cannot settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.783Z"},"updatedAt":"2026-04-23T14:31:41.528Z"}}