{"id":"16a4cd2e-be8b-45f0-ae4f-998b8002668e","shortId":"hdQYxB","kind":"x402","title":"Query STX wallet balances via x402 micropayment on Base for $0.02 per request.","tagline":"Query STX wallet balances via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns STX (Stacks) wallet balance data, gated behind an x402 payment challenge. 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 utility services. 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/STX/balance` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header containing a signed payment proof for up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a maximum timeout of 300 seconds. No API keys or rate limits are advertised; access is granted purely through per-call micropayments.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, 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 and required request body fields are unknown.","tags":[],"capabilities":["wallet-balance-query","stx-balance","x402-payment","usdc-settlement","base-network","per-call-micropayment","json-api"],"categories":["crypto","finance"],"synonyms":["STX balance API","Stacks wallet balance","crypto wallet balance check","STX balance lookup","blockchain balance query","wallet balance endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition found; request body fields and response format are unknown.","Example request JSON is speculative — the actual required fields are undocumented.","The broader platform lists many endpoints but none appear to have public documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/STX/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/STX/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 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty stubs. The request and response formats are entirely 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'0.02':11,24,78,131 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '20':124 '300':151 '402':217 '6':135 'STX balance API' 'STX balance lookup' 'Stacks wallet balance' 'accept':95 'access':161 'actual':221 'address':142 'advertis':160 'ai/ml':64 'analyt':63 'api':55,154,179 'balanc':4,17,35 'base':9,22,89,126,145 'base-network' 'behind':38 'blockchain balance query' 'bodi':227 'broader':48 'call':54,168 'caller':108 'challeng':42,218 'confirm':212 'connect':188 'contain':116 'crypto wallet balance check' 'data':36,62 'decim':136 'detail':195 'doc':178 'document':170,204 'endpoint':28,71,93,210 'exampl':208 'extrem':175 'field':228 'finance/web3':66 'format':223 'gate':37 'grant':163 'handl':103 'header':115 'i.e':130 'includ':110 'infer':65 'json':100 'json-api' 'key':155 'limit':158 'live':213 'lowpaymentfee.com':30 'maximum':148 'micropay':7,20,169 'model':83 'must':109 'network':90 'offer':56 'openapi':199 'page':183 'part':45 'pay':52 'pay-per-cal':51 'payment':41,101,114,119,138 'per':12,25,53,80,167 'per-cal':166 'per-call-micropayment' 'per-request':79 'platform':74 'post':96 'price':82,180 'prompt':190 'proof':120 'proper':216 'protocol':107 'provid':60 'pure':164 'queri':1,14 'rate':157 'readm':182 'render':185 'request':13,26,81,97,226 'request/response':202 'requir':225 'respons':222 'return':31,99,214 'schema':203 'second':152 'sent':140 'servic':69 'settl':84 'share':75 'sign':118 'sinc':132 'site':173 'span':61 'spars':176 'spec':200 'specif':92 'stack':33 'stx':2,15,32 'stx-balance' 'suit':49 'technic':194 'timeout':149 'uniform':77 'unit':127 'unknown':230 'usag':207 'usdc':86,129,133 'usdc-settlement' 'use':134 'util':68 'via':5,18,104 'wallet':3,16,34,189 'wallet balance endpoint' 'wallet-balance-query' 'x':113 'x-payment':112 'x402':6,19,40,106 'x402-payment'","prices":[{"id":"8c83282b-759f-4192-a8e9-e1ceb3cc61e6","listingId":"16a4cd2e-be8b-45f0-ae4f-998b8002668e","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/STX/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":"2026-04-18T19:28:26.990Z"}],"sources":[{"listingId":"16a4cd2e-be8b-45f0-ae4f-998b8002668e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/STX/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:26.990Z","lastSeenAt":"2026-04-23T10:01:34.500Z"}],"details":{"listingId":"16a4cd2e-be8b-45f0-ae4f-998b8002668e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/STX/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{\"address\": \"SP2J6ZY48GV1EZ5V2V5RB9MP66SW86PYKKNRV9EJ7\"}'","exampleRequest":{"address":"SP2J6ZY48GV1EZ5V2V5RB9MP66SW86PYKKNRV9EJ7"},"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/STX/balance"},{"claim":"All endpoints 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":"Payment is made in USD Coin (USDC) to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/wallet/STX/balance"}],"useCases":["Checking STX token balances for a given wallet address","Building portfolio trackers that need on-demand balance lookups","Automated agents querying Stacks wallet balances without API key management","Pay-per-use balance checks in trading bots or DeFi dashboards"],"bestFor":["Agents or apps needing occasional STX balance lookups without subscription commitments","Developers who prefer x402 micropayment access over traditional API key auth","Low-volume or bursty wallet balance queries at $0.02 per call"],"notFor":["High-frequency balance polling where per-call costs would accumulate quickly","Users who need detailed transaction history or full blockchain node data beyond balances","Anyone without USDC on Base network to pay for requests"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.205Z"},"updatedAt":"2026-04-23T10:01:34.500Z"}}