{"id":"3a199ac8-1d0b-42b4-aa59-c08903b70b64","shortId":"ApkBxB","kind":"x402","title":"Query TRX wallet balances via x402 micropayment — $0.02 per request on Base.","tagline":"Query TRX wallet balances via x402 micropayment — $0.02 per request on Base.","description":"This endpoint at lowpaymentfee.com returns TRX (Tron) wallet balance data, gated behind the x402 payment protocol. Callers pay $0.02 per request in USDC on the Base network — no API keys, no rate limits, and no sign-up required. The x402 challenge confirms the endpoint is live and accepts exact-scheme payments to a specified address.\n\nThe provider operates a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all at the same $0.02-per-request price point. However, the specific endpoint cataloged here is `/api/v1/wallet/TRX/balance`, which appears to return balance information for a given TRX wallet address. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl — the docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no substantive content.\n\nBecause the endpoint lacks published input/output schemas and documentation beyond the landing page summary, integrators will need to experiment with the POST body to determine the expected request format (likely a JSON object containing a TRX wallet address). The x402 challenge confirms USDC settlement on Base (contract 0x8335…2913) with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals).","tags":[],"capabilities":["trx-wallet-balance","x402-payment","usdc-base-settlement","pay-per-request","no-api-key"],"categories":["crypto","finance"],"synonyms":["tron balance","TRX balance lookup","tron wallet balance API","crypto wallet balance","x402 crypto API","micropayment API"],"warnings":["No OpenAPI or JSON schema available — request and response formats are unknown","Documentation pages (/docs, /api, /pricing, /README) returned no useful content beyond a wallet-connect prompt","Example request JSON is speculative based on the URL pattern; actual required fields are undocumented","The provider lists many endpoints but none have published schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/TRX/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/TRX/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and settlement details, but there is no OpenAPI schema, no documented request/response format, and the docs pages are empty. The endpoint's actual behavior must be inferred from the URL path 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'0.02':8,20,43,110,225 '000':221 '0x8335':213 '20':220 '2913':214 '6':229 'TRX balance lookup' 'accept':73 'address':81,135,203 'ai/ml':99 'amount':218 'analyt':98 'api':53,95,153 'appear':125 'balanc':4,16,33,128 'base':12,24,50,211,222 'behind':36 'beyond':175 'bodi':188 'broader':86 'call':94 'caller':41 'catalog':120 'challeng':66,206 'confirm':67,207 'connect':159 'contain':199 'content':165 'contract':212 'crawl':148 'crypto wallet balance' 'data':34,97,102 'decim':230 'detail':142 'determin':190 'doc':150 'document':143,174 'dozen':89 'endpoint':26,69,119,168 'exact':75 'exact-schem':74 'exampl':140 'expect':192 'experi':184 'finance/web3':101 'format':194 'found':145 'gate':35 'given':132,226 'howev':116 'i.e':224 'infer':100 'inform':129 'input/output':171 'integr':180 'json':197 'key':54 'lack':169 'land':177 'like':195 'limit':57 'live':71 'lowpaymentfee.com':28 'max':217 'micropay':7,19 'micropayment API' 'need':182 'network':51 'no-api-key' 'object':198 'offer':88 'openapi':137 'oper':84 'page':154,178 'pay':42,92 'pay-per-cal':91 'pay-per-request' 'payment':39,77 'per':9,21,44,93,112 'per-request':111 'platform':87 'point':115 'post':187 'price':114,151 'prompt':161 'protocol':40 'provid':83 'publish':170 'queri':1,13 'rate':56 'render':156 'request':10,22,45,113,193 'request/response':139 'requir':63 'return':29,127 'schema':138,172 'scheme':76 'servic':105 'settlement':209 'sign':61 'sign-up':60 'span':96 'specif':118 'specifi':80 'substant':164 'summari':179 'tron':31 'tron balance' 'tron wallet balance API' 'trx':2,14,30,133,201 'trx-wallet-balance' 'unit':223 'usdc':47,208,227 'usdc-base-settlement' 'util':104 'via':5,17 'wallet':3,15,32,134,160,202 'x402':6,18,38,65,205 'x402 crypto API' 'x402-payment'","prices":[{"id":"85f478cc-bb35-42ad-895f-820fc642a826","listingId":"3a199ac8-1d0b-42b4-aa59-c08903b70b64","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/TRX/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":"2026-04-18T19:28:30.080Z"}],"sources":[{"listingId":"3a199ac8-1d0b-42b4-aa59-c08903b70b64","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/TRX/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:30.080Z","lastSeenAt":"2026-04-23T09:31:50.457Z"}],"details":{"listingId":"3a199ac8-1d0b-42b4-aa59-c08903b70b64","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/TRX/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{\"address\": \"TXyz...\"}'","exampleRequest":{"address":"TJCnKsPa7y5okkXvQAidZBzqx3QyQ6sxMW"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/wallet/TRX/balance"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units USDC, 6 decimals)","source_url":"https://lowpaymentfee.com"},{"claim":"Settlement in USDC on Base network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/wallet/TRX/balance"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"}],"useCases":["Checking TRX wallet balances programmatically without API key registration","Integrating Tron balance lookups into agent workflows that support x402 payments","Building portfolio trackers that query multiple blockchain balances on demand"],"bestFor":["Agents or bots that can settle x402 payments in USDC on Base","Developers needing quick, keyless access to TRX balance data","Low-volume or sporadic queries where per-call pricing is preferable to subscriptions"],"notFor":["High-volume balance monitoring where per-call costs add up quickly","Users who need detailed TRX transaction history or token-level breakdowns (not evidenced by this endpoint)","Callers who cannot settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.1Z"},"updatedAt":"2026-04-23T09:31:50.457Z"}}