{"id":"041c66a3-8f2a-4634-8b8c-08ae54a4e015","shortId":"uXmeGv","kind":"x402","title":"Check ADA wallet balances via x402 micropayment on Base for $0.02 per request.","tagline":"Check ADA wallet balances via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns Cardano (ADA) wallet balance data, gated behind an x402 payment challenge. Each call 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 operates 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 sits in the Finance & Web3 category and is focused on cryptocurrency wallet balance lookups for ADA. The response MIME type is application/json. Payment is settled on the Base L2 network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) 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 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 well-formed 402 challenge), but the actual response schema and required POST body are unknown.","tags":[],"capabilities":["ada-wallet-balance","x402-payment","usdc-base-settlement","pay-per-call","no-api-key","crypto-balance-lookup"],"categories":["crypto","finance"],"synonyms":["ADA balance API","Cardano wallet balance","crypto wallet lookup","ADA address balance","cryptocurrency balance check","wallet balance query","Cardano blockchain data"],"warnings":["No OpenAPI or schema documentation available — request body format is unknown and must be guessed","All doc pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no content","Response schema is completely undocumented; example_response_json is null because it cannot be inferred","The provider's catalog lists many endpoints but none have detailed documentation visible in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/ADA/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/ADA/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 with a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no usage examples, and all documentation pages are empty stubs. The request and response JSON examples are inferred/guessed, not 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'/docs':169 '/pricing':170 '/readme':173 '0.02':11,24,46,114 '000':48 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':153 '20':47 '300':156 '402':214 '6':60 'ADA address balance' 'ADA balance API' 'Cardano blockchain data' 'Cardano wallet balance' 'access':85 'actual':218 'ada':2,15,33,135 'ada-wallet-balance' 'addit':184 'ai/ml':103 'analyt':102 'api':63,99 'application/json':141 'attach':72 'avail':200 'balanc':4,17,35,132 'base':9,22,49,55,147 'behind':38 'beyond':161 'bodi':224 'broad':92 'call':44,98 'caller':70 'cardano':32 'catalog':93 'categori':125 'challeng':42,215 'check':1,14 'confirm':207 'connect':179 'contract':152 'cost':45 'crawl':203 'crypto wallet lookup' 'crypto-balance-lookup' 'cryptocurr':130 'cryptocurrency balance check' 'data':36,87,101,106 'decim':61 'detail':186 'document':160,195 'endpoint':28,119,205 'exampl':199 'extrem':166 'financ':123 'finance/web3':105 'focus':128 'form':213 'gate':37 'header':77 'infer':104 'key':64 'l2':148 'land':163 'limit':67 'live':208 'lookup':133 'lowpaymentfee.com':30 'micropay':7,20 'mime':138 'network':56,149 'no-api-key' 'openapi':190 'oper':90 'page':164,174 'pay':96 'pay-per-cal':95 'pay-per-call' 'payment':41,76,82,142,158 'per':12,25,97,115 'post':223 'price':111 'prompt':181 'proof':83 'provid':89 'rate':66 'render':176 'request':13,26,116 'request/response':193 'requir':69,222 'respons':137,219 'return':31,209 'schema':194,220 'second':157 'servic':109 'settl':144 'simpli':71 'sit':120 'span':100 'spars':167 'spec':191 'specif':118 'technic':185 'timeout':159 'type':139 'uniform':112 'unit':50 'unknown':226 'usag':198 'usdc':52,58,151 'usdc-base-settlement' 'use':150 'util':108 'valid':80 'via':5,18 'wallet':3,16,34,131,180 'wallet balance query' 'web3':124 'well':212 'well-form':211 'x':75 'x-payment':74 'x402':6,19,40,81 'x402-payment'","prices":[{"id":"5ae62c8e-6eb1-4da2-94c6-4d6de386b4ec","listingId":"041c66a3-8f2a-4634-8b8c-08ae54a4e015","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/ADA/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":"2026-04-18T19:28:12.435Z"}],"sources":[{"listingId":"041c66a3-8f2a-4634-8b8c-08ae54a4e015","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/ADA/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:12.435Z","lastSeenAt":"2026-04-23T14:01:59.980Z"}],"details":{"listingId":"041c66a3-8f2a-4634-8b8c-08ae54a4e015","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/ADA/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{\"address\": \"addr1qx...\"}'","exampleRequest":{"address":"addr1qxck8mq3ms0ydqfhsqe7aqnz8wgs30t5z5gkr5s5080qlf2hcpgk"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 challenge with x402Version 1, USDC on Base, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/wallet/ADA/balance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wallet/ADA/balance"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Payment timeout is 300 seconds and payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/wallet/ADA/balance"}],"useCases":["Checking the balance of a Cardano (ADA) wallet address programmatically","Building portfolio trackers that need ADA balance data","Automated monitoring of ADA wallet holdings","Agent-driven crypto balance verification without API key management"],"bestFor":["Developers needing quick ADA balance lookups without signup","AI agents that can settle x402 micropayments on Base","Applications requiring on-demand crypto balance data with no rate limits"],"notFor":["High-volume batch queries where $0.02/request adds up significantly","Users who need detailed ADA transaction history or staking data (not indicated as supported)","Developers without USDC on Base network for payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.906Z"},"updatedAt":"2026-04-23T14:01:59.980Z"}}