{"id":"f7d6fe6a-631a-4232-9368-9692d7e1863a","shortId":"mWBxyE","kind":"x402","title":"Query FLOW wallet balance via x402 micropayment on Base for $0.02 per request.","tagline":"Query FLOW wallet balance via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns the wallet balance for the FLOW token. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all settled via the x402 protocol on the Base network using USDC. The specific endpoint `/api/v1/wallet/FLOW/balance` accepts POST requests and returns JSON.\n\nPricing is $0.02 per request (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 402 with a valid payment challenge specifying the `exact` scheme, USDC asset contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base, and a 300-second payment timeout.\n\nThe provider's landing page lists many other endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories, all at the same $0.02 price point. However, documentation pages (`/docs`, `/pricing`, `/README`) returned only a \"Connect wallet\" prompt with no substantive content, so details about request parameters, response schema, and the exact data source for FLOW balances are unknown.","tags":[],"capabilities":["wallet-balance","flow-token","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["crypto","finance"],"synonyms":["FLOW balance","FLOW wallet","crypto balance check","token balance API","Flow blockchain balance","wallet balance lookup"],"warnings":["No documentation available — /docs, /pricing, and /README pages are empty (only show 'Connect wallet')","Request body schema and response schema are unknown; the example request is inferred","Data source for FLOW wallet balances is unspecified","The provider lists many endpoints across diverse categories (AI, analytics, geocoding, etc.) all at $0.02 — unclear if all are fully functional"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/FLOW/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/FLOW/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 USDC on Base). However, there is no documentation, no OpenAPI schema, no example responses, and no details about request parameters or the data source for FLOW balances. The docs, pricing, and README pages all returned only a wallet-connect prompt with no 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'/docs':166 '/pricing':167 '/readme':168 '0.02':11,24,79,160 '000':83 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':131 '20':82 '300':136 '402':118 '6':89 'FLOW balance' 'FLOW wallet' 'Flow blockchain balance' 'accept':71 'account':104 'across':149 'ai/ml':151 'api':51,102 'asset':129 'balanc':4,17,34,193 'base':9,22,63,84,133 'base-network' 'broader':44 'call':50 'categori':155 'challeng':112,123 'confirm':114 'connect':172 'content':178 'contract':130 'crypto balance check' 'data':189 'data/analytics':150 'decim':90 'detail':180 'document':164 'endpoint':28,69,148 'exact':126,188 'finance/web3':152 'flow':2,15,37,192 'flow-token' 'header':100 'howev':163 'infrastructur':154 'inlin':94 'json':76 'key':103 'land':143 'limit':107 'list':145 'live':115 'lowpaymentfee.com':30,54 'made':93 'mani':146 'micropay':7,20 'network':64 'no-api-key' 'offer':52 'page':144,165 'paramet':183 'part':41 'pay':48 'pay-per-cal':47 'pay-per-call' 'payment':91,99,122,138 'per':12,25,49,80 'point':162 'post':72 'price':77,161 'prompt':174 'protocol':60 'provid':141 'queri':1,14 'rate':106 'request':13,26,73,81,182 'requir':109 'respons':184 'return':31,75,116,169 'schema':185 'scheme':127 'second':137 'settl':56 'sourc':190 'specif':68 'specifi':124 'substant':177 'suit':45 'timeout':139 'token':38 'token balance API' 'unit':85 'unknown':195 'usdc':66,87,128 'usdc-settlement' 'use':65 'valid':121 'via':5,18,57,95 'wallet':3,16,33,173 'wallet balance lookup' 'wallet-balance' 'x':98 'x-payment':97 'x402':6,19,59,111 'x402-payment'","prices":[{"id":"817cb813-8802-4eb7-9dde-7567861b094a","listingId":"f7d6fe6a-631a-4232-9368-9692d7e1863a","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/FLOW/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":"2026-04-18T19:28:09.912Z"}],"sources":[{"listingId":"f7d6fe6a-631a-4232-9368-9692d7e1863a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/FLOW/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:09.912Z","lastSeenAt":"2026-04-23T14:31:40.684Z"}],"details":{"listingId":"f7d6fe6a-631a-4232-9368-9692d7e1863a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/FLOW/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{\"address\": \"0x...\"}'","exampleRequest":{"address":"0x1234567890abcdef1234567890abcdef12345678"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/FLOW/balance"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/FLOW/balance"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Checking the balance of a FLOW wallet address programmatically","Integrating FLOW balance lookups into a portfolio tracker or dashboard","Automated monitoring of FLOW token holdings"],"bestFor":["Agents or apps needing on-demand FLOW wallet balance queries without API key management","Developers who want pay-per-call crypto data without subscriptions","x402-compatible agents on the Base network"],"notFor":["High-volume balance polling where $0.02/request adds up quickly","Users needing detailed FLOW transaction history or staking data (not offered by this endpoint)","Querying balances for tokens other than FLOW (separate endpoints exist)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.998Z"},"updatedAt":"2026-04-23T14:31:40.684Z"}}