{"id":"e55d36c7-bd6a-48fb-a4b0-abcfc39db57e","shortId":"NG93K6","kind":"x402","title":"Check USDT wallet balance via x402 micropayment on Base network for $0.02 per request.","tagline":"Check USDT wallet balance via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides a USDT wallet balance lookup accessible via the x402 payment protocol. It is part of a broader suite of pay-per-call APIs covering data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/wallet/USDT/balance` accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers attach an `X-PAYMENT` header containing a signed payment facilitator token. The challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are imposed; access is gated solely by micropayment.\n\nDocumentation on the site is minimal — the docs, pricing, and API pages all resolve to a wallet-connect prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and no example payloads. The endpoint is confirmed live (returns a proper 402 challenge).","tags":[],"capabilities":["usdt-balance-lookup","x402-payment","base-network","per-request-micropayment","no-api-key","json-response"],"categories":["finance","crypto"],"synonyms":["USDT balance API","Tether balance check","wallet balance endpoint","crypto balance query","x402 wallet API","Base network USDT"],"warnings":["No OpenAPI or formal schema available — request and response formats are unknown","Documentation pages (/docs, /pricing, /api) contain no usable content","The example request JSON is inferred from the endpoint path; actual required fields are undocumented","No SLA, rate-limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/USDT/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/USDT/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/request in USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and the site's docs pages are empty wallet-connect stubs. The actual behavior of the balance endpoint is entirely inferred from its URL 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'0.02':12,26,71,131 '000':120 '0x8335':125 '20':119 '2913':126 '402':201 '6':135 'Base network USDT' 'Tether balance check' 'USDT balance API' 'accept':85 'access':39,145 'addit':173 'advertis':114 'ai/ml':61 'amount':117 'analyt':60 'api':57,138,161 'attach':100 'balanc':4,18,37 'base':9,23,79,121,128 'base-network' 'beyond':184 'broader':50 'call':56 'caller':99 'challeng':113,202 'check':1,15 'confirm':196 'connect':169 'contain':106 'cover':58 'crypto balance query' 'data':59,64 'decim':136 'detail':175 'doc':158 'document':151 'endpoint':30,83,194 'equal':130 'exampl':191 'facilit':110 'finance/web3':63 'gate':147 'given':132 'handl':93 'header':105 'impos':144 'infer':62 'infrastructur':66 'inlin':94 'json':90 'json-response' 'key':139 'limit':142 'live':197 'lookup':38 'lowpaymentfee.com':32 'max':116 'micropay':7,21,150 'minim':156 'network':10,24,80 'no-api-key' 'openapi':179 'outputschema':187 'page':162 'part':47 'pay':54 'pay-per-cal':53 'payload':192 'payment':43,91,104,109 'per':13,27,55,72 'per-request-micropayment' 'post':86 'price':69,159 'prompt':170 'proper':200 'protocol':44,98 'provid':33 'rate':141 'request':14,28,73,87 'request/response':182 'resolv':164 'return':89,198 'schema':183 'settl':74 'sign':108 'site':154 'sole':148 'spec':180 'specif':82 'stub':188 'suit':51 'technic':174 'token':111 'unit':122 'usdc':76,124,133 'usdt':2,16,35 'usdt-balance-lookup' 'util':67 'via':5,19,40,95 'wallet':3,17,36,168 'wallet balance endpoint' 'wallet-connect':167 'x':103 'x-payment':102 'x402':6,20,42,97,186 'x402 wallet API' 'x402-payment'","prices":[{"id":"bb926c9d-62db-4dc2-82f0-d9e8a756139a","listingId":"e55d36c7-bd6a-48fb-a4b0-abcfc39db57e","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/USDT/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":"2026-04-18T19:28:39.852Z"}],"sources":[{"listingId":"e55d36c7-bd6a-48fb-a4b0-abcfc39db57e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/USDT/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:39.852Z","lastSeenAt":"2026-04-23T08:02:05.695Z"}],"details":{"listingId":"e55d36c7-bd6a-48fb-a4b0-abcfc39db57e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/USDT/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed_x402_token>\" \\\n  -d '{\"address\": \"0xYourWalletAddress\"}'","exampleRequest":{"address":"0x1234567890abcdef1234567890abcdef12345678"},"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/USDT/balance"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys or rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/USDT/balance"}],"useCases":["Querying a USDT wallet balance programmatically without needing an API key","Integrating wallet balance checks into autonomous agent workflows that settle payments on-chain","Building dashboards that pull real-time USDT balances via micropayment-gated calls"],"bestFor":["Agents or bots that need on-demand USDT balance data without subscription overhead","Developers prototyping x402-based payment flows on Base","Low-volume, pay-as-you-go wallet balance lookups"],"notFor":["High-frequency trading systems needing sub-second latency guarantees (no SLA documented)","Users who need detailed transaction history or multi-token portfolio views","Anyone without a Base-network USDC wallet to fund requests"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.582Z"},"updatedAt":"2026-04-23T08:02:05.695Z"}}