{"id":"796586d8-fff7-4cb8-8f2d-53190c25746c","shortId":"C3T5t7","kind":"x402","title":"Query LRC (Loopring) wallet balance via x402 micropayment on Base for $0.02 per request.","tagline":"Query LRC (Loopring) wallet balance via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns the wallet balance for LRC (Loopring) 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 utility services. All endpoints are gated via the x402 protocol, settling payments in USDC on the Base network.\n\nThe specific endpoint `/api/v1/wallet/LRC/balance` accepts POST requests and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is made inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required. The x402 challenge was successfully captured, confirming the endpoint is live and accepting payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\n\nDocumentation is extremely sparse. The provider's landing page lists available endpoints and pricing but the /docs, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact request body format and response structure must be inferred or discovered experimentally.","tags":[],"capabilities":["wallet-balance-query","lrc-loopring","x402-payment","usdc-base-network","pay-per-request","no-api-key","crypto-data"],"categories":["crypto","finance"],"synonyms":["Loopring balance","LRC wallet balance","token balance API","crypto balance check","wallet balance lookup","x402 crypto API","Loopring token query"],"warnings":["No API documentation available — /docs, /pricing, and /README pages all show only 'Connect wallet' with no technical content","No OpenAPI or schema specification found","Request body format and response structure are unknown and must be discovered experimentally","The example_request_json is speculative — actual required fields are undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/LRC/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/LRC/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The request body and response format are entirely 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'/docs':157 '/pricing':158 '/readme':160 '0.02':12,26,93 '000':97 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '20':96 '6':103 'LRC wallet balance' 'Loopring balance' 'Loopring token query' 'accept':88,136 'account':118 'address':139 'ai/ml':62 'analyt':61 'api':53,116 'avail':151,187 'balanc':5,19,36 'base':10,24,82,98 'bodi':191 'broader':46 'call':52,95 'captur':129 'challeng':126 'confirm':130 'connect':166 'cost':92 'crypto balance check' 'crypto-data' 'data':60 'decim':104 'detail':173 'discov':200 'document':141,182 'endpoint':30,69,86,132,152 'exact':189 'exampl':185 'experiment':201 'extrem':143 'finance/web3':64 'format':192 'gate':71 'header':114 'infer':63,198 'inlin':108 'key':117 'land':148 'limit':121 'list':150 'live':134 'loopr':3,17,39 'lowpaymentfee.com':32 'lrc':2,16,38 'lrc-loopring' 'made':107 'micropay':8,22 'must':196 'network':83 'no-api-key' 'offer':54 'openapi':177 'page':149,161 'part':43 'pay':50 'pay-per-cal':49 'pay-per-request' 'payload':186 'payment':77,105,113,137 'per':13,27,51,94 'post':89 'price':154 'prompt':168 'protocol':75 'provid':58,146 'queri':1,15 'rate':120 'render':163 'request':14,28,90,190 'request/response':180 'requir':123 'respons':194 'return':33 'schema':181 'servic':67 'settl':76 'span':59 'spars':144 'spec':178 'specif':85 'structur':195 'success':128 'suit':47 'technic':172 'token':40 'token balance API' 'unit':99 'usdc':79,101 'usdc-base-network' 'util':66 'via':6,20,72,109 'wallet':4,18,35,167 'wallet balance lookup' 'wallet-balance-query' 'x':112 'x-payment':111 'x402':7,21,74,125 'x402 crypto API' 'x402-payment'","prices":[{"id":"69bfdc04-9010-4ac6-b82c-be1a1ed0faf9","listingId":"796586d8-fff7-4cb8-8f2d-53190c25746c","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/LRC/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":"2026-04-18T19:28:22.740Z"}],"sources":[{"listingId":"796586d8-fff7-4cb8-8f2d-53190c25746c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/LRC/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:22.740Z","lastSeenAt":"2026-04-23T11:04:02.648Z"}],"details":{"listingId":"796586d8-fff7-4cb8-8f2d-53190c25746c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/LRC/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, confirming it is live on Base network with USDC payment","source_url":"https://lowpaymentfee.com/api/v1/wallet/LRC/balance"},{"claim":"Price is $0.02 per request across all listed endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/LRC/balance"}],"useCases":["Check LRC (Loopring) token balance for a given wallet address","Integrate wallet balance monitoring into trading bots or portfolio dashboards","Verify LRC holdings before executing on-chain transactions","Build alerting systems that track wallet balance changes"],"bestFor":["Developers needing quick, keyless LRC balance lookups","Agents or bots that can settle x402 micropayments on Base","Projects that want pay-per-use pricing without subscription commitments"],"notFor":["Bulk historical balance queries (no batch or historical endpoint documented)","Users who cannot settle USDC payments on the Base network","Production use cases requiring well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.43Z"},"updatedAt":"2026-04-23T11:04:02.648Z"}}