{"id":"dc05acf0-b5e3-4539-90eb-87caeea29459","shortId":"TejMYW","kind":"x402","title":"Query CRV wallet balance on Base via x402 micropayment at $0.02 per request.","tagline":"Query CRV wallet balance on Base via x402 micropayment at $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns the wallet balance for CRV (Curve DAO Token) on the Base network. 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 Base with no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint `/api/v1/wallet/CRV/balance` accepts POST requests and charges a maximum of $0.02 per call (20,000 base units of USDC, which has 6 decimals). Payment is made via the x402 exact scheme to the payee address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a timeout of 300 seconds. The response MIME type is `application/json`.\n\nDocumentation on the site 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 a proper 402 challenge), but the actual response format and required request body fields are unknown.","tags":[],"capabilities":["crypto-wallet-balance","crv-token","x402-payment","usdc-settlement","base-network","pay-per-call"],"categories":["crypto","finance"],"synonyms":["CRV balance","Curve DAO Token balance","wallet balance API","crypto balance lookup","Base network wallet","CRV wallet query"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown and inferred","All docs/pricing/README pages on the site render only 'Connect wallet' with no technical content","The example_request_json is speculative; actual required fields are undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/CRV/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/CRV/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty stubs. The request body and response format are entirely 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'0.02':11,24,104 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':129 '20':107 '300':134 '402':193 '6':115 'Base network wallet' 'CRV balance' 'CRV wallet query' 'Curve DAO Token balance' 'accept':96 'actual':197 'address':128 'ai/ml':63 'analyt':62 'api':56,83,152 'application/json':141 'avail':180 'balanc':4,17,34 'base':6,19,42,80,109 'base-network' 'bodi':203 'broader':49 'call':55,106 'challeng':194 'charg':100 'confirm':188 'connect':160 'crawl':183 'crv':2,15,36 'crv-token' 'crypto balance lookup' 'crypto-wallet-balance' 'curv':37 'dao':38 'data':61 'decim':116 'detail':167 'doc':150 'document':142 'endpoint':28,70,94,186 'exact':123 'exampl':179 'extrem':147 'field':204 'finance/web3':65 'format':199 'infer':64 'infrastructur':67 'key':84 'limit':87 'live':189 'lowpaymentfee.com':30,59 'made':119 'materi':184 'maximum':102 'micropay':9,22 'mime':138 'network':43 'offer':57 'openapi':171 'page':155 'part':46 'pay':53 'pay-per-cal':52 'pay-per-call' 'paye':127 'payment':74,117 'per':12,25,54,105 'post':97 'price':151 'prompt':162 'proper':192 'protocol':75 'queri':1,14 'rate':86 'readm':154 'render':157 'request':13,26,98,202 'request/response':174 'requir':91,201 'respons':137,198 'return':31,190 'schema':175 'scheme':124 'second':135 'settl':76 'site':145 'span':60 'spars':148 'spec':172 'specif':93 'subscript':90 'suit':50 'technic':166 'timeout':132 'token':39 'type':139 'unit':110 'unknown':206 'usag':178 'usdc':78,112 'usdc-settlement' 'use':71 'util':68 'via':7,20,120 'wallet':3,16,33,161 'wallet balance API' 'x402':8,21,73,122 'x402-payment'","prices":[{"id":"8b92ecbf-04e1-4dd6-b27b-da65edb03625","listingId":"dc05acf0-b5e3-4539-90eb-87caeea29459","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/CRV/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":"2026-04-18T19:28:05.103Z"}],"sources":[{"listingId":"dc05acf0-b5e3-4539-90eb-87caeea29459","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/CRV/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:05.103Z","lastSeenAt":"2026-04-23T16:03:03.813Z"}],"details":{"listingId":"dc05acf0-b5e3-4539-90eb-87caeea29459","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/CRV/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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/CRV/balance"},{"claim":"All APIs on the site are 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":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/CRV/balance"}],"useCases":["Check CRV token balance for a given wallet address on Base","Integrate CRV balance checks into portfolio tracking dashboards","Automate wallet monitoring for Curve DAO Token holdings"],"bestFor":["Agents needing on-demand CRV balance lookups without API key management","Developers building crypto portfolio tools on Base","Micropayment-friendly workflows that need per-call billing"],"notFor":["Bulk or high-frequency balance polling where $0.02/call adds up quickly","Users who need balances for tokens not offered by this provider","Anyone requiring detailed documentation or SLA guarantees before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.151Z"},"updatedAt":"2026-04-23T16:03:03.813Z"}}