{"id":"d1b1fac0-efc5-4916-9b5f-7742e0305281","shortId":"3h3Uyh","kind":"x402","title":"Check ZEC wallet balances via x402 micropayment on Base for $0.02 per request.","tagline":"Check ZEC wallet balances via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns Zcash (ZEC) wallet balance information, gated behind an x402 payment challenge. Each request costs $0.02 (20,000 base units of USDC on the Base network, where USDC has 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the data.\n\nThe provider, lowpaymentfee.com, offers a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced uniformly at $0.02 per request. This specific endpoint (`/api/v1/wallet/ZEC/balance`) falls under the finance/Web3 category. The x402 challenge specifies the \"exact\" payment scheme, settling in USDC (contract 0x8335…2913) on Base, with a 300-second payment timeout.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The actual response format for a successful balance query is unknown and must be inferred. Callers should expect a JSON response containing a ZEC balance value, but the exact shape is unconfirmed.","tags":[],"capabilities":["x402-payment","zec-wallet-balance","usdc-base-settlement","pay-per-request","no-api-key","crypto-balance-lookup"],"categories":["crypto","finance"],"synonyms":["Zcash balance API","ZEC wallet balance","crypto wallet balance check","Zcash address balance","x402 crypto API","micropayment API","ZEC balance lookup"],"warnings":["No OpenAPI or schema documentation available — request and response formats are entirely inferred.","All documentation pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no content.","The actual data source for ZEC balances is unknown — it is unclear whether this queries a full node, a block explorer, or a third-party API.","Response schema is unconfirmed; the example_response_json is null because no successful response was observed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/ZEC/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/ZEC/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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no response examples, and no confirmation of the request format. The docs pages are empty. The listing is largely 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'/api/v1/wallet/zec/balance':121 '/docs':158 '/pricing':159 '/readme':162 '0.02':11,24,46,115 '000':48 '0x8335':139 '20':47 '2913':140 '300':145 '6':60 'ZEC balance lookup' 'ZEC wallet balance' 'Zcash address balance' 'Zcash balance API' 'access':85 'actual':192 'ai/ml':104 'analyt':103 'api':63,100 'attach':72 'avail':187 'balanc':4,17,35,198,215 'base':9,22,49,55,142 'behind':38 'beyond':150 'broad':93 'call':99 'caller':70,206 'catalog':94 'categori':126 'challeng':42,129 'check':1,14 'connect':168 'contain':212 'content':174 'contract':138 'cost':45 'crawl':190 'crypto wallet balance check' 'crypto-balance-lookup' 'data':87,102,107 'decim':61 'document':149 'endpoint':28,120 'exact':132,219 'exampl':186 'expect':208 'extrem':155 'fall':122 'finance/web3':106,125 'format':194 'gate':37 'header':77 'infer':105,205 'inform':36 'json':210 'key':64 'land':152 'limit':67 'lowpaymentfee.com':30,90 'micropay':7,20 'micropayment API' 'must':203 'network':56 'no-api-key' 'offer':91 'openapi':178 'page':153,163 'pay':97 'pay-per-cal':96 'pay-per-request' 'payment':41,76,82,133,147 'per':12,25,98,116 'price':112 'prompt':170 'proof':83 'provid':89 'queri':199 'rate':66 'render':165 'request':13,26,44,117 'request/response':181 'requir':69 'respons':193,211 'return':31 'schema':182 'scheme':134 'second':146 'servic':110 'settl':135 'shape':220 'simpli':71 'span':101 'spars':156 'spec':179 'specif':119 'specifi':130 'substant':173 'success':197 'timeout':148 'unconfirm':222 'uniform':113 'unit':50 'unknown':201 'usag':185 'usdc':52,58,137 'usdc-base-settlement' 'util':109 'valid':80 'valu':216 'via':5,18 'wallet':3,16,34,169 'x':75 'x-payment':74 'x402':6,19,40,81,128 'x402 crypto API' 'x402-payment' 'zcash':32 'zec':2,15,33,214 'zec-wallet-balance'","prices":[{"id":"2679f363-49e0-48c0-a0b6-dd3e202d2904","listingId":"d1b1fac0-efc5-4916-9b5f-7742e0305281","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/ZEC/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":"2026-04-18T19:28:39.233Z"}],"sources":[{"listingId":"d1b1fac0-efc5-4916-9b5f-7742e0305281","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/ZEC/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:39.233Z","lastSeenAt":"2026-04-23T09:31:50.868Z"}],"details":{"listingId":"d1b1fac0-efc5-4916-9b5f-7742e0305281","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/ZEC/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{\"address\": \"t1exampleZcashAddress...\"}'","exampleRequest":{"address":"t1KstBMLVgcfFNMxyRNWREdKuMWKNKmeLna"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/ZEC/balance"},{"claim":"maxAmountRequired is 20000 base units of USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/wallet/ZEC/balance"},{"claim":"The provider advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider lists finance/Web3 endpoints including price feeds, exchange rates, token quotes, and gas estimates","source_url":"https://lowpaymentfee.com"}],"useCases":["Checking the balance of a Zcash wallet address programmatically","Integrating ZEC balance data into portfolio tracking dashboards","Automated monitoring of ZEC wallet balances for alerting or accounting"],"bestFor":["Developers needing on-demand ZEC balance lookups without API key management","Agents or bots that can settle x402 micropayments on Base","Low-volume, pay-as-you-go crypto balance queries"],"notFor":["High-frequency trading requiring sub-second latency and bulk queries","Users who need detailed ZEC transaction history or shielded address support","Anyone unable to settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.581Z"},"updatedAt":"2026-04-23T09:31:50.868Z"}}