{"id":"414d4198-b910-4a7f-9713-ecdcfcf25d44","shortId":"EzJCT6","kind":"x402","title":"Check CRO wallet balance via x402 micropayment on Base for $0.02 per request.","tagline":"Check CRO wallet balance via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns the wallet balance for CRO (Cronos) tokens. It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/wallet/CRO/balance` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys are required; payment is handled inline via the X-PAYMENT header. The provider advertises no rate limits and instant access.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint is confirmed live (returns HTTP 402 with a valid x402 challenge), but the actual response format for a successful paid call is unknown.","tags":[],"capabilities":["crypto-wallet-balance","cro-balance-lookup","x402-micropayment","usdc-base-settlement","pay-per-request"],"categories":["crypto","finance"],"synonyms":["CRO balance API","Cronos wallet balance","crypto balance check","wallet balance lookup","x402 crypto API","lowpaymentfee wallet"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown and inferred","All doc pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The example_request_json is speculative; actual required fields are undocumented","It is unclear what blockchain or wallet type the CRO balance endpoint queries"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/CRO/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/CRO/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 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and all documentation pages are empty stubs. The request body format and response structure are entirely 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'/api/v1/wallet/cro/balance':83 '/docs':146 '/pricing':147 '/readme':150 '0.02':11,24,110 '000':99 '0x8335':104 '20':98 '2913':105 '402':188 '6':115 'CRO balance API' 'Cronos wallet balance' 'accept':84 'access':140 'actual':196 'advertis':93,134 'ai/ml':60 'analyt':59 'api':51,118 'avail':176 'balanc':4,17,34 'base':9,22,78,100,107 'broader':44 'call':50,203 'challeng':92,193 'check':1,14 'confirm':184 'connect':156 'cost':96 'crawl':179 'cro':2,15,36 'cro-balance-lookup' 'crono':37 'crypto balance check' 'crypto-wallet-balance' 'data':58 'decim':116 'detail':163 'document':141 'endpoint':28,67,82,182 'equal':109 'exampl':175 'extrem':143 'finance/web3':62 'format':198 'handl':124 'header':131 'http':187 'infer':61 'infrastructur':64 'inlin':125 'instant':139 'json':89 'key':119 'limit':137 'live':185 'lowpaymentfee wallet' 'lowpaymentfee.com':30 'materi':180 'maximum':95 'micropay':7,20 'network':79 'offer':52 'openapi':167 'page':151 'paid':202 'part':41 'pay':48 'pay-per-cal':47 'pay-per-request' 'payment':71,122,130 'per':12,25,49,111 'post':85 'prompt':158 'protocol':72 'provid':56,133 'rate':136 'render':153 'request':13,26,86,112 'request/response':170 'requir':121 'respons':197 'return':31,88,186 'schema':171 'settl':73 'span':57 'spars':144 'spec':168 'specif':81 'success':201 'suit':45 'technic':162 'token':38 'unit':101 'unknown':205 'usag':174 'usdc':75,103,113 'usdc-base-settlement' 'use':68,114 'util':65 'valid':191 'via':5,18,126 'wallet':3,16,33,157 'wallet balance lookup' 'x':129 'x-payment':128 'x402':6,19,70,91,192 'x402 crypto API' 'x402-micropayment'","prices":[{"id":"d82f9e40-328b-4d3e-95a4-004211fc9dd9","listingId":"414d4198-b910-4a7f-9713-ecdcfcf25d44","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/CRO/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":"2026-04-18T19:28:08.696Z"}],"sources":[{"listingId":"414d4198-b910-4a7f-9713-ecdcfcf25d44","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/CRO/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:08.696Z","lastSeenAt":"2026-04-23T14:01:59.223Z"}],"details":{"listingId":"414d4198-b910-4a7f-9713-ecdcfcf25d44","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/CRO/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"address\": \"0xYourWalletAddress\"}'","exampleRequest":{"address":"0x1234567890abcdef1234567890abcdef12345678"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/CRO/balance"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Checking CRO token balance for a given wallet address","Integrating wallet balance lookups into portfolio trackers","Automated monitoring of Cronos holdings"],"bestFor":["Agents needing quick one-off CRO balance checks without API key registration","Developers prototyping crypto dashboards who want pay-per-call pricing","x402-native workflows that settle payments in USDC on Base"],"notFor":["High-frequency balance polling where per-request fees add up quickly","Users who need detailed transaction history or multi-token balance in a single call"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.028Z"},"updatedAt":"2026-04-23T14:01:59.223Z"}}