{"id":"e01ee16d-23b5-4d74-ae04-5553196909aa","shortId":"nTGRuP","kind":"x402","title":"Query ATOM wallet balances via x402 micropayment on Base for $0.02 per request.","tagline":"Query ATOM wallet balances via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns ATOM (Cosmos) wallet balance data, gated behind the x402 payment protocol. Callers pay $0.02 per request in USDC on the Base network — no API keys, no rate limits, and no sign-up required. The payment is settled on-chain via the x402 \"exact\" scheme, meaning a single fixed payment per call.\n\nThe provider hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all at the same $0.02 price point. This specific endpoint focuses on cryptocurrency wallet balance lookups for the ATOM token. The response MIME type is application/json. The endpoint accepts POST requests.\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 example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual request body format and response structure must be discovered experimentally.","tags":[],"capabilities":["crypto-wallet-balance","atom-balance-lookup","x402-payment","usdc-base-settlement","pay-per-request","no-api-key"],"categories":["crypto","finance"],"synonyms":["ATOM balance API","Cosmos wallet balance","crypto balance check","wallet balance lookup","ATOM address balance","cryptocurrency balance endpoint"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages are all empty beyond a wallet-connect prompt","No OpenAPI or schema definition; request body format is unknown and the example_request_json is speculative","No response schema or example response available","Provider description is generic ('Premium API Access') with no endpoint-specific detail"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/ATOM/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/ATOM/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 clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and all doc pages are empty stubs. The request body format and response structure are entirely unknown and must be 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'/docs':147 '/pricing':148 '/readme':151 '0.02':11,24,45,111 '402':187 'ATOM address balance' 'ATOM balance API' 'Cosmos wallet balance' 'accept':135 'actual':192 'addit':162 'ai/ml':100 'analyt':99 'api':55,96 'application/json':132 'atom':2,15,32,125 'atom-balance-lookup' 'avail':178 'balanc':4,17,35,121 'base':9,22,52 'behind':38 'beyond':139 'bodi':194 'broad':89 'call':84,95 'caller':43 'catalog':90 'chain':72 'challeng':189 'confirm':182 'connect':157 'cosmos':33 'crypto balance check' 'crypto-wallet-balance' 'cryptocurr':119 'cryptocurrency balance endpoint' 'data':36,98,103 'detail':164 'discov':201 'document':138,173 'endpoint':28,116,134,180 'exact':76 'exampl':176 'experiment':202 'extrem':144 'finance/web3':102 'fix':81 'focus':117 'format':195 'gate':37 'host':87 'infer':101 'key':56 'land':141 'limit':59 'live':183 'lookup':122 'lowpaymentfee.com':30 'mean':78 'micropay':7,20 'mime':129 'must':199 'network':53 'no-api-key' 'on-chain':70 'openapi':168 'page':142,152 'pay':44,93 'pay-per-cal':92 'pay-per-request' 'payload':177 'payment':41,67,82 'per':12,25,46,83,94 'point':113 'post':136 'price':112 'prompt':159 'proper':186 'protocol':42 'provid':86 'queri':1,14 'rate':58 'render':154 'request':13,26,47,137,193 'request/response':171 'requir':65 'respons':128,197 'return':31,184 'schema':172 'scheme':77 'servic':106 'settl':69 'sign':63 'sign-up':62 'singl':80 'span':97 'spars':145 'spec':169 'specif':115 'structur':198 'technic':163 'token':126 'type':130 'usdc':49 'usdc-base-settlement' 'util':105 'via':5,18,73 'wallet':3,16,34,120,158 'wallet balance lookup' 'x402':6,19,40,75,188 'x402-payment'","prices":[{"id":"fda7b5e7-1ddf-4c10-9f8c-f33508dc33ef","listingId":"e01ee16d-23b5-4d74-ae04-5553196909aa","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/ATOM/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":"2026-04-18T19:28:16.072Z"}],"sources":[{"listingId":"e01ee16d-23b5-4d74-ae04-5553196909aa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/ATOM/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:16.072Z","lastSeenAt":"2026-04-23T12:32:03.064Z"}],"details":{"listingId":"e01ee16d-23b5-4d74-ae04-5553196909aa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/ATOM/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{\"address\": \"cosmos1...\"}'","exampleRequest":{"address":"cosmos1exampleaddress123"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 challenge with status 402, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/wallet/ATOM/balance"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 in USDC with 6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/ATOM/balance"},{"claim":"Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying the balance of an ATOM/Cosmos wallet address programmatically","Building portfolio trackers that need real-time ATOM balance data","Automated monitoring of ATOM wallet balances in trading bots or dashboards"],"bestFor":["Developers needing on-demand ATOM wallet balance queries without API key management","Agents or bots that can settle x402 micropayments on Base","Low-volume or sporadic balance lookups where pay-per-call is more economical than a subscription"],"notFor":["High-frequency balance polling where $0.02/request adds up quickly","Users who need balances for many different chains in a single call","Anyone without a Base-compatible USDC wallet to settle x402 payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.764Z"},"updatedAt":"2026-04-23T12:32:03.064Z"}}