{"id":"15e7920a-ff0e-4d84-8f7a-3a5c573ce3a0","shortId":"MxCXKW","kind":"x402","title":"Query ZRX token wallet balances via x402 micropayment on Base for $0.02/request.","tagline":"Query ZRX token wallet balances via x402 micropayment on Base for $0.02/request.","description":"This endpoint at lowpaymentfee.com returns the balance of a ZRX (0x Protocol) wallet. 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 infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/wallet/ZRX/balance` accepts POST requests and is gated behind an x402 challenge. The maximum amount required per call is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.\n\nDocumentation is extremely sparse. The provider's landing page lists many endpoints at uniform $0.02 pricing, but 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, and no usage examples available from the crawl. The actual response format for a wallet balance query is unknown and must be inferred.","tags":[],"capabilities":["wallet-balance","zrx-token","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["crypto","finance"],"synonyms":["ZRX balance","0x token balance","wallet balance API","crypto balance check","token balance lookup","Web3 wallet query"],"warnings":["No OpenAPI or schema documentation available — request and response formats are inferred/guessed","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","Response schema for wallet balance query is completely unknown","The provider lists many diverse endpoints (AI, analytics, finance, utils) all at $0.02 — unclear if all are fully implemented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/ZRX/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/ZRX/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request/response schema, no examples, and all doc pages return only a wallet-connect prompt. The actual behavior of this endpoint is largely 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'/request':13,26 '0.02':12,25,113,167 '000':103 '0x':37 '0x token balance' '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':108 '20':102 '300':151 '6':117 'Web3 wallet query' 'ZRX balance' 'accept':85 'access':127 'actual':206 'address':145 'advertis':126 'ai/ml':61 'amount':97 'analyt':60 'api':52,120,172 'avail':201 'balanc':5,18,33,212 'base':10,23,79,104,110 'base-network' 'behind':91 'broader':45 'call':51,100 'challeng':94 'connect':181 'crawl':204 'crypto balance check' 'data':59 'decim':118 'detail':188 'doc':171 'document':153 'endpoint':28,68,83,164 'equal':112 'exampl':200 'extrem':155 'finance/web3':63 'format':208 'gate':90 'given':114 'header':139 'includ':133 'infer':62,219 'infrastructur':65 'instant':129 'key':121 'land':160 'limit':124 'list':162 'lowpaymentfee.com':30 'mani':163 'maximum':96 'micropay':8,21 'must':217 'network':80 'no-api-key' 'offer':53 'openapi':192 'page':161,176 'part':42 'pay':49 'pay-per-cal':48 'pay-per-request' 'payment':72,131,138,141 'per':50,99 'post':86 'price':168,173 'prompt':183 'protocol':38,73 'provid':57,158 'queri':1,14,213 'rate':123 'readm':175 'render':178 'request':87 'request/response':195 'requir':98 'respons':207 'return':31 'schema':196 'second':152 'sent':143 'settl':74 'span':58 'spars':156 'spec':193 'specif':82 'suit':46 'technic':187 'timeout':149 'token':3,16 'token balance lookup' 'uniform':166 'unit':105 'unknown':215 'usag':199 'usdc':76,107,115 'usdc-settlement' 'use':69 'util':66 'via':6,19 'wallet':4,17,39,182,211 'wallet balance API' 'wallet-balance' 'x':137 'x-payment':136 'x402':7,20,71,93 'x402-payment' 'zrx':2,15,36 'zrx-token'","prices":[{"id":"688261e5-0bdc-4817-9733-0caddc7123d7","listingId":"15e7920a-ff0e-4d84-8f7a-3a5c573ce3a0","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/ZRX/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":"2026-04-18T19:28:29.468Z"}],"sources":[{"listingId":"15e7920a-ff0e-4d84-8f7a-3a5c573ce3a0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/ZRX/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:29.468Z","lastSeenAt":"2026-04-23T09:31:50.457Z"}],"details":{"listingId":"15e7920a-ff0e-4d84-8f7a-3a5c573ce3a0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/ZRX/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"address\": \"0xYourWalletAddress\"}'","exampleRequest":{"address":"0x1234567890abcdef1234567890abcdef12345678"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requires maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/ZRX/balance"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wallet/ZRX/balance"}],"useCases":["Checking the ZRX token balance of a specific wallet address","Building portfolio trackers that need on-demand balance lookups","Automating balance monitoring for 0x Protocol tokens","Agent-driven crypto wallet inspection without API key management"],"bestFor":["Agents or apps needing one-off ZRX balance checks without subscription overhead","Developers who prefer pay-per-call crypto data access on Base","Workflows that already settle micropayments in USDC on Base"],"notFor":["High-frequency balance polling where per-request fees add up quickly","Users who need balances for many tokens in a single call (this endpoint is ZRX-specific)","Anyone requiring detailed documentation or guaranteed SLAs before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.091Z"},"updatedAt":"2026-04-23T09:31:50.457Z"}}