{"id":"b500c9e5-8676-4a87-94bd-11e88dde4fae","shortId":"H76Fdr","kind":"x402","title":"Query KLAY wallet balances via x402 micropayment on Base for $0.02 per request.","tagline":"Query KLAY wallet balances via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns KLAY (Klaytn) wallet balance data, gated behind the x402 payment protocol. Callers send a POST request with an X-PAYMENT header containing a signed USDC payment on the Base network. The cost is $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — access is granted purely through per-call micropayment.\n\nThe provider, lowpaymentfee.com, hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced uniformly at $0.02 per request. This specific endpoint sits in the Finance & Web3 category and is focused on retrieving cryptocurrency wallet balances for the KLAY token. The response format is application/json.\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 additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual response schema and required request body fields are unknown.","tags":[],"capabilities":["wallet-balance-query","klay-token","x402-micropayment","usdc-payment","base-network","crypto-data","per-call-pricing","no-api-key"],"categories":["crypto","finance"],"synonyms":["KLAY balance","Klaytn wallet balance","crypto wallet balance API","blockchain balance check","KLAY token balance","x402 crypto API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are all empty beyond a wallet-connect prompt","No OpenAPI or schema definition found; request body fields are guessed","Response schema is completely unknown — example_response_json is null","The provider hosts many endpoints with identical generic descriptions ('Premium API Access'), making it unclear how well-maintained each individual endpoint is"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/KLAY/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/KLAY/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 x402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, and all documentation pages are empty stubs. The request body and response format are entirely 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'/docs':159 '/pricing':160 '/readme':163 '0.02':11,24,66,121 '000':70 '20':69 '402':202 '6':76 'KLAY balance' 'KLAY token balance' 'Klaytn wallet balance' 'access':86 'actual':207 'addit':174 'ai/ml':110 'analyt':109 'api':79,106 'application/json':149 'avail':190 'balanc':4,17,35,140 'base':9,22,61,71 'base-network' 'behind':38 'beyond':151 'blockchain balance check' 'bodi':213 'broad':100 'call':93 'caller':43 'catalog':101 'categori':132 'challeng':204 'confirm':197 'connect':169 'contain':54 'cost':64 'crawl':193 'crypto wallet balance API' 'crypto-data' 'cryptocurr':138 'data':36,108,113 'decim':77 'detail':176 'document':150,185 'endpoint':28,126,195 'exampl':189 'extrem':156 'field':214 'financ':130 'finance/web3':112 'focus':135 'format':147 'gate':37,105 'grant':88 'header':53 'host':98 'infer':111 'key':80 'klay':2,15,32,143 'klay-token' 'klaytn':33 'land':153 'limit':83 'live':198 'lowpaymentfee.com':30,97 'micropay':7,20,94 'network':62 'no-api-key' 'openapi':180 'page':154,164 'payment':41,52,58 'per':12,25,67,92,122 'per-cal':91 'per-call-pricing' 'post':46 'price':118 'prompt':171 'proper':201 'protocol':42 'provid':96 'pure':89 'queri':1,14 'rate':82 'render':166 'request':13,26,47,68,123,212 'request/response':183 'requir':85,211 'respons':146,208 'retriev':137 'return':31,199 'schema':184,209 'send':44 'servic':116 'sign':56 'sit':127 'span':107 'spars':157 'spec':181 'specif':125 'technic':175 'token':144 'uniform':119 'unit':72 'unknown':216 'usag':188 'usdc':57,74 'usdc-payment' 'util':115 'via':5,18 'wallet':3,16,34,139,170 'wallet-balance-query' 'web3':131 'x':51 'x-payment':50 'x402':6,19,40,104,203 'x402 crypto API' 'x402-gated':103 'x402-micropayment'","prices":[{"id":"b23acb5b-aace-46ba-bc79-004a5cbf257d","listingId":"b500c9e5-8676-4a87-94bd-11e88dde4fae","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/KLAY/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":"2026-04-18T19:28:18.471Z"}],"sources":[{"listingId":"b500c9e5-8676-4a87-94bd-11e88dde4fae","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/KLAY/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:18.471Z","lastSeenAt":"2026-04-23T12:32:03.173Z"}],"details":{"listingId":"b500c9e5-8676-4a87-94bd-11e88dde4fae","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/KLAY/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -d '{\"address\": \"0xYourKlayWalletAddress\"}'","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 network","source_url":"https://lowpaymentfee.com/api/v1/wallet/KLAY/balance"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com"}],"useCases":["Checking KLAY token balances for a given wallet address","Integrating Klaytn balance lookups into portfolio trackers or dashboards","Automated monitoring of KLAY holdings across wallets","Agent-driven crypto balance queries without API key management"],"bestFor":["Developers needing quick, keyless access to KLAY wallet balances","AI agents that can settle x402 micropayments on Base","Applications requiring pay-per-use crypto data without subscriptions"],"notFor":["High-volume balance queries where $0.02/call adds up significantly","Users needing balances for tokens other than KLAY (different endpoints exist)","Anyone requiring detailed transaction history beyond simple balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.646Z"},"updatedAt":"2026-04-23T12:32:03.173Z"}}