{"id":"bec4f1a4-4a5b-4722-809c-5fb03edf2d93","shortId":"bbP9nq","kind":"x402","title":"Query SAND token wallet balance via x402 micropayment on Base network for $0.02 per request.","tagline":"Query SAND token wallet balance via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns the wallet balance for the SAND token. It is part of a broader suite of pay-per-request APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are gated behind the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/wallet/SAND/balance` accepts POST requests and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or accounts are required — callers authenticate purely via the x402 payment header. The provider advertises no rate limits and instant access.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response format for a successful paid request is unknown.","tags":[],"capabilities":["wallet-balance-query","sand-token","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["crypto","finance"],"synonyms":["SAND balance","SAND wallet","token balance API","crypto wallet balance","The Sandbox token balance","x402 crypto API","micropayment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI spec or request/response schema provided","Actual response format after successful payment is unknown","The provider lists many diverse API categories (AI, analytics, finance, utilities) all at $0.02 — unclear whether all are fully implemented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/SAND/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/SAND/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 challenge, but documentation is essentially nonexistent — no request/response schemas, no examples, and every doc page just shows 'Connect wallet'. The actual behavior of the endpoint after payment is entirely 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'/api/v1/wallet/sand/balance':89 '/docs':145 '/pricing':146 '/readme':149 '0.02':13,28,95 '000':99 '20':98 '402':184 '6':105 'SAND balance' 'SAND wallet' 'The Sandbox token balance' 'accept':90 'access':130 'account':111 'actual':188 'advertis':124 'ai/ml':64 'analyt':63 'api':55,108 'authent':115 'avail':139 'balanc':5,20,38 'base':10,25,84,100 'base-network' 'behind':74 'broader':48 'call':97 'caller':114 'challeng':185 'confirm':179 'connect':155 'cost':94 'crypto wallet balance' 'data':62 'decim':106 'detail':162 'document':131,171 'endpoint':32,71,88,140,177 'exampl':175 'extrem':133 'finance/web3':66 'format':190 'gate':73 'header':121 'infer':65 'instant':129 'key':109 'land':136 'limit':127 'list':138 'live':180 'lowpaymentfee.com':34 'micropay':8,23 'micropayment API' 'network':11,26,85 'no-api-key' 'offer':56 'openapi':166 'page':137,150 'paid':194 'part':45 'pay':52 'pay-per-request':51 'payment':77,120 'per':14,29,53,96 'post':91 'price':142 'prompt':157 'proper':183 'protocol':78 'provid':60,123 'pure':116 'queri':1,16 'rate':126 'render':152 'request':15,30,54,92,195 'request/response':169 'requir':113 'respons':189 'return':35,181 'sand':2,17,41 'sand-token' 'schema':170 'servic':69 'settl':79 'span':61 'spars':134 'spec':167 'specif':87 'success':193 'suit':49 'technic':161 'token':3,18,42 'token balance API' 'unit':101 'unknown':197 'usag':174 'usdc':81,103 'usdc-settlement' 'util':68 'via':6,21,117 'wallet':4,19,37,156 'wallet-balance-query' 'x402':7,22,76,119 'x402 crypto API' 'x402-payment'","prices":[{"id":"5a2b92e5-e04f-4ae9-8dbd-b84b267bc927","listingId":"bec4f1a4-4a5b-4722-809c-5fb03edf2d93","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/SAND/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":"2026-04-18T19:28:22.741Z"}],"sources":[{"listingId":"bec4f1a4-4a5b-4722-809c-5fb03edf2d93","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/SAND/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:22.741Z","lastSeenAt":"2026-04-23T11:04:02.626Z"}],"details":{"listingId":"bec4f1a4-4a5b-4722-809c-5fb03edf2d93","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/SAND/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 a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/SAND/balance"},{"claim":"Provider advertises $0.02 per request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/SAND/balance"}],"useCases":["Checking SAND token balance for a given wallet address","Monitoring SAND holdings programmatically","Building portfolio dashboards that include SAND balances","Automated trading bots needing SAND balance checks"],"bestFor":["Agents needing on-demand SAND wallet balance without API key management","Developers who want pay-per-call crypto data without subscriptions","x402-native workflows on Base network"],"notFor":["Bulk or high-frequency balance polling (no documented batch endpoint)","Users needing detailed SAND transaction history or analytics","Anyone requiring comprehensive documentation or SLA guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.432Z"},"updatedAt":"2026-04-23T11:04:02.626Z"}}