{"id":"5e783eaf-b57d-4aa0-85de-193bcac3a3e0","shortId":"9DXGNb","kind":"x402","title":"Query FXS token wallet balance via x402 micropayment on Base for $0.02 per request.","tagline":"Query FXS token wallet balance via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns the wallet balance for the FXS (Frax Share) token. 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 data, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network at a flat rate of $0.02 per request.\n\nThe specific endpoint `/api/v1/wallet/FXS/balance` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring an exact payment of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the payTo address on Base. No API keys or rate limits are advertised — access is gated purely by the x402 micropayment.\n\nDocumentation is extremely sparse. The provider's docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the balance response contains. The endpoint's actual behavior (e.g., whether you supply a wallet address in the POST body or it returns aggregate data) must be inferred or discovered by paying for a call.","tags":[],"capabilities":["wallet-balance","fxs-token","x402-payment","usdc-settlement","base-network","pay-per-request","crypto-data"],"categories":["finance","crypto"],"synonyms":["FXS balance","Frax Share wallet","token balance API","crypto wallet balance","FXS wallet query","x402 crypto API","micropayment API"],"warnings":["No OpenAPI or schema documentation available; request/response formats are unknown","All non-homepage pages (docs, pricing, API, README) render only 'Connect wallet' with no content","Example request JSON is inferred — the actual required POST body is undocumented","The endpoint description 'Premium API Access' is generic and does not describe the FXS balance functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/FXS/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/FXS/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 via a valid x402 402 challenge with clear pricing. However, documentation is essentially nonexistent — no OpenAPI schema, no request/response examples, and no explanation of accepted parameters or response format. The request body and response JSON shown above are inferred, not 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'0.02':12,26,93,124 '000':119 '20':118 '6':129 'FXS balance' 'FXS wallet query' 'Frax Share wallet' 'accept':100 'access':145 'actual':199 'addit':175 'address':134,207 'advertis':144 'aggreg':215 'ai/ml':64 'analyt':63 'api':55,138,162 'balanc':5,19,36,193 'base':10,24,86,120,136 'base-network' 'behavior':200 'bodi':211 'broader':48 'call':54,226 'challeng':108 'confirm':109 'connect':170 'contain':195 'crypto wallet balance' 'crypto-data' 'data':62,67,216 'decim':130 'descript':188 'detail':177 'discov':221 'doc':160 'document':153 'e.g':201 'endpoint':30,72,98,197 'exact':115 'exampl':185 'extrem':155 'field':191 'finance/web3':66 'flat':90 'frax':40 'fxs':2,16,39 'fxs-token' 'gate':147 'infer':65,219 'json':105 'key':139 'limit':142 'live':112 'lowpaymentfee.com':32 'micropay':8,22,152 'micropayment API' 'must':217 'network':87 'offer':56 'openapi':181 'page':165 'part':45 'pay':52,223 'pay-per-cal':51 'pay-per-request' 'payment':79,116 'payto':133 'per':13,27,53,94 'platform':75 'post':101,210 'price':161 'prompt':172 'protocol':80 'provid':60,158 'pure':148 'queri':1,15 'rate':91,141 'readm':164 'render':167 'request':14,28,95,102 'request/response':184 'requir':113 'respons':194 'return':33,104,214 'schema':182 'servic':70 'settl':81 'share':41 'sinc':126 'span':61 'spars':156 'specif':97 'suit':49 'suppli':204 'technic':176 'token':3,17,42 'token balance API' 'unit':121 'usd':125 'usdc':83,123,127 'usdc-settlement' 'use':76,128 'util':69 'via':6,20 'wallet':4,18,35,171,206 'wallet-balance' 'whether':202 'x402':7,21,78,107,151 'x402 crypto API' 'x402-payment'","prices":[{"id":"1e626f48-e7d8-4054-b866-5cbd8eaa3f66","listingId":"5e783eaf-b57d-4aa0-85de-193bcac3a3e0","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/FXS/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":"2026-04-18T19:28:20.276Z"}],"sources":[{"listingId":"5e783eaf-b57d-4aa0-85de-193bcac3a3e0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/FXS/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:20.276Z","lastSeenAt":"2026-04-23T12:32:03.208Z"}],"details":{"listingId":"5e783eaf-b57d-4aa0-85de-193bcac3a3e0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/FXS/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 HTTP 402 with an x402 challenge requiring 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/FXS/balance"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 corresponds to USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/FXS/balance"}],"useCases":["Querying FXS (Frax Share) token balance for a given wallet address","Integrating real-time FXS balance checks into portfolio trackers or bots","Agent-driven on-chain balance lookups without API key management"],"bestFor":["Developers needing keyless, pay-per-call FXS balance lookups","AI agents that can settle x402 micropayments on Base","Applications requiring low-friction crypto data without subscriptions"],"notFor":["Bulk or high-volume balance queries where $0.02/call adds up quickly","Users who need detailed transaction history or multi-token portfolio data","Anyone without a Base-compatible USDC wallet for x402 payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.557Z"},"updatedAt":"2026-04-23T12:32:03.208Z"}}