{"id":"71499401-170c-4d08-beca-e6ad03fbb7e0","shortId":"fHNbzf","kind":"x402","title":"Check IOTA wallet balances via x402 micropayment on Base for $0.02 per request.","tagline":"Check IOTA wallet balances via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns IOTA wallet balance data, accessible through the x402 payment protocol. It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform share a uniform $0.02-per-request pricing model settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/wallet/IOTA/balance` accepts POST requests and returns JSON. Payment is handled via the x402 `exact` scheme: callers attach an `X-PAYMENT` header with a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the provider's address on Base. No API keys or accounts are required — access is granted per-request upon valid payment. The provider advertises no rate limits.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the provider. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response format and accepted request parameters are unknown.","tags":[],"capabilities":["iota-wallet-balance","x402-payment","usdc-base-settlement","pay-per-request","no-api-key","crypto-balance-lookup"],"categories":["crypto","finance"],"synonyms":["IOTA balance API","IOTA wallet lookup","crypto wallet balance","IOTA address balance","x402 crypto API","micropayment API","pay-per-call wallet API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only a 'Connect wallet' prompt","No request or response schema provided; request body format and response structure are unknown","No OpenAPI or machine-readable spec found","Endpoint functionality is inferred solely from the URL path; actual capabilities are unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/IOTA/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/IOTA/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 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The actual behavior of the endpoint is entirely unknown beyond its URL path suggesting IOTA balance 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'0.02':11,24,78,129 '000':125 '20':124 '402':212 '6':133 'IOTA address balance' 'IOTA balance API' 'IOTA wallet lookup' 'accept':95,220 'access':36,149 'account':146 'actual':216 'addit':185 'address':139 'advertis':160 'ai/ml':63 'analyt':62 'api':54,143,171 'attach':110 'avail':200 'balanc':4,17,34 'base':9,22,89,126,141 'broader':47 'call':53 'caller':109 'challeng':213 'check':1,14 'confirm':207 'connect':180 'crawl':169 'crypto':66 'crypto wallet balance' 'crypto-balance-lookup' 'data':35,61 'decim':134 'detail':187 'doc':170 'document':164 'endpoint':28,71,93,205 'exact':107 'exampl':199 'extrem':166 'financ':65 'format':218 'grant':151 'handl':103 'header':115 'i.e':128 'infer':64 'iota':2,15,32 'iota-wallet-balance' 'json':100 'key':144 'limit':163 'live':208 'lowpaymentfee.com':30 'micropay':7,20 'micropayment API' 'model':83 'network':90 'no-api-key' 'offer':55 'openapi':191 'page':175 'paramet':222 'part':44 'pay':51 'pay-per-cal':50 'pay-per-call wallet API' 'pay-per-request' 'payment':40,101,114,120,157 'per':12,25,52,80,153 'per-request':79,152 'platform':74 'post':96 'price':82,172 'prompt':182 'proper':211 'protocol':41 'provid':59,137,159,203 'rate':162 'readm':174 'render':177 'request':13,26,81,97,154,221 'request/response':194 'requir':148 'respons':217 'return':31,99,209 'schema':195 'scheme':108 'servic':69 'settl':84 'share':75 'sign':118 'sinc':130 'span':60 'spars':167 'spec':192 'specif':92 'suit':48 'technic':186 'uniform':77 'unit':127 'unknown':224 'upon':155 'usag':198 'usdc':86,119,131 'usdc-base-settlement' 'use':132 'util':68 'valid':156 'via':5,18,104 'wallet':3,16,33,181 'x':113 'x-payment':112 'x402':6,19,39,106 'x402 crypto API' 'x402-payment'","prices":[{"id":"5915bf19-95b6-4420-8556-f235900754cb","listingId":"71499401-170c-4d08-beca-e6ad03fbb7e0","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/IOTA/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":"2026-04-18T19:28:17.857Z"}],"sources":[{"listingId":"71499401-170c-4d08-beca-e6ad03fbb7e0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/IOTA/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:17.857Z","lastSeenAt":"2026-04-23T12:32:03.132Z"}],"details":{"listingId":"71499401-170c-4d08-beca-e6ad03fbb7e0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/IOTA/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\"","exampleRequest":null,"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, exact scheme, USDC on Base, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/wallet/IOTA/balance"},{"claim":"All APIs on the platform 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 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/IOTA/balance"}],"useCases":["Querying IOTA wallet balances programmatically without needing an API key","Integrating IOTA balance checks into agent workflows that support x402 payments","Building dashboards or bots that monitor IOTA holdings"],"bestFor":["Agents or apps that already support x402 payment protocol","Low-volume, on-demand IOTA balance lookups","Developers who want keyless API access with per-call crypto payments"],"notFor":["High-volume bulk balance queries where $0.02/request adds up quickly","Users who need detailed IOTA transaction history or advanced ledger data","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.662Z"},"updatedAt":"2026-04-23T12:32:03.132Z"}}