{"id":"2bced781-05c2-44db-9c31-ed134d6114e7","shortId":"rcsMUs","kind":"x402","title":"Query THETA wallet balance via x402 micropayment on Base for $0.02 per request.","tagline":"Query THETA wallet balance via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns the wallet balance for the THETA 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, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/wallet/THETA/balance` accepts POST requests and returns JSON. Each call costs a maximum of 20,000 base units of USDC (6 decimals), which equals $0.02. Payment is handled via the x402 `exact` scheme — no API keys, subscriptions, or rate limits are required. The provider advertises instant access and a uniform $0.02/request price across all their endpoints.\n\nDocumentation is extremely sparse. The provider's 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 accepted request parameters are unknown.","tags":[],"capabilities":["wallet-balance","theta-token","x402-payment","usdc-settlement","base-network","pay-per-call","crypto-data"],"categories":["crypto","finance"],"synonyms":["THETA balance","wallet balance API","THETA wallet","crypto balance check","token balance lookup","blockchain wallet query"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or output schema provided; request and response formats are unknown","The example request JSON is inferred and may not match the actual expected input","Provider offers many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/THETA/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/THETA/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 x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no response schema, and no examples. The request body format is entirely inferred. This is effectively a stub 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'/request':133 '0.02':11,24,106,132 '000':97 '20':96 '402':185 '6':102 'THETA balance' 'THETA wallet' 'accept':84,193 'access':128 'across':135 'actual':189 'advertis':126 'ai/ml':60 'analyt':59 'api':51,116,147 'balanc':4,17,34 'base':9,22,78,98 'base-network' 'blockchain wallet query' 'broader':44 'call':50,91 'challeng':186 'confirm':180 'connect':156 'cost':92 'crypto balance check' 'crypto-data' 'data':58 'decim':103 'detail':163 'doc':146 'document':139,172 'endpoint':28,67,82,138,178 'equal':105 'exact':113 'exampl':176 'extrem':141 'finance/web3':62 'format':191 'handl':109 'infer':61 'instant':127 'json':89 'key':117 'limit':121 'live':181 'lowpaymentfee.com':30 'maximum':94 'micropay':7,20 'network':79 'offer':52 'openapi':167 'page':151 'paramet':195 'part':41 'pay':48 'pay-per-cal':47 'pay-per-call' 'payment':71,107 'per':12,25,49 'post':85 'price':134,148 'prompt':158 'proper':184 'protocol':72 'provid':56,125,144 'queri':1,14 'rate':120 'readm':150 'render':153 'request':13,26,86,194 'request/response':170 'requir':123 'respons':190 'return':31,88,182 'schema':171 'scheme':114 'servic':65 'settl':73 'span':57 'spars':142 'spec':168 'specif':81 'subscript':118 'suit':45 'technic':162 'theta':2,15,37 'theta-token' 'token':38 'token balance lookup' 'uniform':131 'unit':99 'unknown':197 'usag':175 'usdc':75,101 'usdc-settlement' 'use':68 'util':64 'via':5,18,110 'wallet':3,16,33,157 'wallet balance API' 'wallet-balance' 'x402':6,19,70,112 'x402-payment'","prices":[{"id":"c15d2fd2-7b9b-4143-9ce4-6442f629a92c","listingId":"2bced781-05c2-44db-9c31-ed134d6114e7","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/THETA/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":"2026-04-18T19:28:19.668Z"}],"sources":[{"listingId":"2bced781-05c2-44db-9c31-ed134d6114e7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/THETA/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:19.668Z","lastSeenAt":"2026-04-23T12:32:03.207Z"}],"details":{"listingId":"2bced781-05c2-44db-9c31-ed134d6114e7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/THETA/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":"Endpoint returns 402 with x402 challenge advertising USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/wallet/THETA/balance"},{"claim":"Provider advertises $0.02/request uniform pricing, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/THETA/balance"}],"useCases":["Checking the current THETA token balance of a wallet address","Building portfolio trackers that need on-demand balance lookups","Automated trading bots that verify wallet holdings before executing trades"],"bestFor":["Agents needing on-demand THETA wallet balance without API key management","Micropayment-based crypto data queries on Base","Low-friction, pay-as-you-go blockchain data access"],"notFor":["High-volume balance polling where $0.02/request adds up quickly","Users needing detailed transaction history or multi-token batch queries","Anyone requiring comprehensive API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.549Z"},"updatedAt":"2026-04-23T12:32:03.207Z"}}