{"id":"a24c181e-e472-4a86-a372-4bff705d5eeb","shortId":"WFyFKY","kind":"x402","title":"Query ANKR wallet balance via x402 micropayment on Base for $0.02 per request.","tagline":"Query ANKR wallet balance via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns the wallet balance for the ANKR token. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, 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/ANKR/balance` accepts POST requests and returns JSON. Payment is handled via the X-PAYMENT header using the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each request is paid individually at the time of the call.\n\nDocumentation on the site is extremely thin: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no explanation of what fields the balance response contains. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know the exact request body format or response structure.","tags":[],"capabilities":["wallet-balance","ankr-token","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["crypto","finance"],"synonyms":["ANKR balance","ANKR wallet","token balance API","crypto balance check","x402 wallet API","micropayment API","ANKR holdings"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response format","Example request JSON is inferred (address field) and may not match actual API contract","The broader lowpaymentfee.com platform lists many endpoints but provides no technical specs for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/ANKR/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/ANKR/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 schema, no documentation beyond a landing page listing, no request/response examples, and all doc pages render only 'Connect wallet'. The listing is largely 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'0.02':11,24,115 '000':110 '20':109 '402':197 '6':120 'ANKR balance' 'ANKR holdings' 'ANKR wallet' 'accept':82 'addit':168 'ai/ml':58 'amount':104 'analyt':57 'ankr':2,15,37 'ankr-token' 'api':51,125,154 'balanc':4,17,34,186 'base':9,22,76,111 'base-network' 'bodi':212 'broader':44 'call':50,107,144 'challeng':198 'commit':133 'confirm':192 'connect':163 'contain':188 'crypto balance check' 'data':56 'decim':121 'detail':170 'difficult':206 'doc':153 'document':145,203 'endpoint':28,65,80,190 'exact':100,210 'exampl':178 'explan':181 'extrem':150 'field':184 'finance/web3':60 'format':213 'handl':90 'header':96 'individu':138 'infer':59 'infrastructur':62 'json':87 'key':126 'know':208 'lack':201 'limit':129 'live':193 'lowpaymentfee.com':30,54 'make':204 'maximum':103 'micropay':7,20 'micropayment API' 'network':77 'no-api-key' 'offer':52 'openapi':174 'page':158 'paid':137 'part':41 'pay':48 'pay-per-cal':47 'pay-per-request' 'payment':69,88,95 'per':12,25,49,106 'post':83 'price':155 'prompt':165 'proper':196 'protocol':70 'queri':1,14 'rate':128 'readm':157 'render':160 'request':13,26,84,135,211 'request/response':177 'requir':105 'respons':187,215 'return':31,86,194 'schema':175 'scheme':101 'settl':71 'sinc':117 'site':148 'span':55 'specif':79 'structur':216 'subscript':132 'suit':45 'technic':169 'thin':151 'time':141 'token':38 'token balance API' 'unit':112 'usd':116 'usdc':73,114,118 'usdc-settlement' 'use':66,97,119 'util':63 'via':5,18,91 'wallet':3,16,33,164 'wallet-balance' 'x':94 'x-payment':93 'x402':6,19,68,99 'x402 wallet API' 'x402-payment'","prices":[{"id":"d0102780-5d0a-46fa-81b0-550aa38fe0fe","listingId":"a24c181e-e472-4a86-a372-4bff705d5eeb","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/ANKR/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":"a24c181e-e472-4a86-a372-4bff705d5eeb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/ANKR/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:12.435Z","lastSeenAt":"2026-04-23T14:31:40.722Z"}],"details":{"listingId":"a24c181e-e472-4a86-a372-4bff705d5eeb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/ANKR/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":"Endpoint returns 402 with x402 challenge, maxAmountRequired 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/ANKR/balance"},{"claim":"All APIs 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 contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/ANKR/balance"}],"useCases":["Check the current ANKR token balance for a given wallet address","Integrate ANKR balance lookups into automated trading or portfolio tracking bots","Agent-driven portfolio monitoring that pays per query with no subscription"],"bestFor":["AI agents needing on-demand crypto balance queries without API key management","Developers who want pay-per-call wallet balance checks settled in USDC on Base","Low-volume or sporadic balance lookups where a subscription would be wasteful"],"notFor":["High-frequency balance polling where per-request fees would accumulate quickly","Users who need detailed transaction history or multi-token portfolio views in a single call","Anyone requiring comprehensive documentation or SLA guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.907Z"},"updatedAt":"2026-04-23T14:31:40.722Z"}}