{"id":"96a34ccc-6271-45d3-9f19-c7dc61da08a0","shortId":"qEhdsC","kind":"x402","title":"Check wallet BAL token balance via x402 micropayment on Base for $0.02 per request.","tagline":"Check wallet BAL token balance via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides a wallet balance lookup for the BAL token, accessible via the x402 payment protocol. It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints on the platform share a uniform $0.02-per-request pricing model, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/wallet/BAL/balance` accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers attach an `X-PAYMENT` header containing a signed USDC payment of up to 0.02 USDC (maxAmountRequired = 20000 base units, USDC has 6 decimals) to the provider's address on Base. No API keys or accounts are required — access is granted per-request upon valid payment. The provider advertises no rate limits and instant access.\n\nDocumentation beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what fields the balance response contains or what input parameters (if any) the POST body expects. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes integration speculative.","tags":[],"capabilities":["wallet-balance-lookup","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["finance","web3"],"synonyms":["BAL balance","wallet balance API","token balance check","Balancer token balance","crypto wallet balance","x402 balance endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all return only a wallet-connect prompt with no content.","No OpenAPI or schema definition found; request and response formats are unknown.","The example request JSON is speculative — the actual required POST body is not documented.","It is unclear what 'BAL' refers to (possibly Balancer token, but unconfirmed)."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/BAL/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/BAL/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, and all documentation pages are empty wallet-connect stubs. The request body and response structure are entirely 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'/api/v1/wallet/bal/balance':99 '/docs':180 '/pricing':182 '/readme':184 '0.02':12,26,83,129 '20000':132 '402':235 '6':137 'BAL balance' 'Balancer token balance' 'accept':100 'access':42,153,170 'account':150 'address':143 'advertis':164 'ai/ml':69 'analyt':68 'api':60,147 'attach':115 'bal':3,17,40 'balanc':5,19,36,214 'base':10,24,94,133,145 'base-network' 'beyond':172 'bodi':225 'broader':53 'call':59 'caller':114 'challeng':236 'check':1,15 'confirm':230 'connect':192 'contain':121,216 'content':197 'crypto wallet balance' 'data':67 'decim':138 'descript':209 'detail':208 'document':171,241 'endpoint':30,76,98,228 'exampl':205 'expect':226 'extrem':177 'field':212 'finance/web3':71 'grant':155 'handl':108 'header':120 'infer':70 'infrastructur':73 'inlin':109 'input':219 'instant':169 'integr':243 'json':105 'key':148 'lack':239 'land':174 'limit':167 'live':231 'lookup':37 'lowpaymentfee.com':32 'make':242 'maxamountrequir':131 'micropay':8,22 'model':88 'network':95 'no-api-key' 'offer':61 'openapi':201 'page':175,185 'paramet':220 'part':50 'pay':57 'pay-per-cal':56 'pay-per-request' 'payment':46,106,119,125,161 'per':13,27,58,85,157 'per-request':84,156 'platform':79 'post':101,224 'price':87 'prompt':193 'proper':234 'protocol':47,113 'provid':33,65,141,163 'rate':166 'request':14,28,86,102,158 'request/response':204 'requir':152 'resolv':187 'respons':215 'return':104,232 'schema':202 'settl':89 'share':80 'sign':123 'span':66 'specif':97 'specul':244 'substant':196 'suit':54 'thin':178 'token':4,18,41 'token balance check' 'uniform':82 'unit':134 'upon':159 'usdc':91,124,130,135 'usdc-settlement' 'util':74 'valid':160 'via':6,20,43,110 'wallet':2,16,35,191 'wallet balance API' 'wallet-balance-lookup' 'wallet-connect':190 'x':118 'x-payment':117 'x402':7,21,45,112 'x402 balance endpoint' 'x402-payment'","prices":[{"id":"bc370ba8-bcad-4d13-8097-57bd5fbe7947","listingId":"96a34ccc-6271-45d3-9f19-c7dc61da08a0","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/BAL/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":"2026-04-18T19:28:15.458Z"}],"sources":[{"listingId":"96a34ccc-6271-45d3-9f19-c7dc61da08a0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/BAL/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:15.458Z","lastSeenAt":"2026-04-23T00:32:32.413Z"}],"details":{"listingId":"96a34ccc-6271-45d3-9f19-c7dc61da08a0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/BAL/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-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 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/BAL/balance"},{"claim":"All APIs on the platform are priced 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/wallet/BAL/balance"}],"useCases":["Querying BAL token balance for a given wallet address","Integrating on-chain balance checks into automated trading or portfolio dashboards","Agent-driven wallet monitoring without API key management"],"bestFor":["Developers needing quick, keyless wallet balance lookups","AI agents that can settle micropayments via x402 on Base","Applications requiring pay-per-call pricing with no subscription commitment"],"notFor":["Bulk or high-volume balance queries where per-call fees add up quickly","Users who need detailed documentation or guaranteed SLAs","Querying balances for tokens other than BAL (this endpoint is BAL-specific)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.781Z"},"updatedAt":"2026-04-23T00:32:32.413Z"}}