{"id":"0d4f3d0c-5637-4b1d-8238-6f42bac20aa8","shortId":"An6FJX","kind":"x402","title":"Check LINK wallet balances on-chain via x402 micropayment at $0.02 per request on Base.","tagline":"Check LINK wallet balances on-chain via x402 micropayment at $0.02 per request on Base.","description":"This endpoint at lowpaymentfee.com returns the balance of a LINK (Chainlink) wallet. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all gated via the x402 payment protocol. Each request costs $0.02 (20,000 base units of USDC on the Base network, where USDC has 6 decimals). No API keys or accounts are required — callers simply attach an x402 payment header with each request.\n\nThe provider's landing page lists dozens of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all at the same $0.02 per-call price point. This specific endpoint (`/api/v1/wallet/LINK/balance`) falls under the Finance & Web3 category and likely returns the LINK token balance for a given wallet address. The endpoint accepts POST requests and returns JSON.\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 x402 challenge is live and well-formed, confirming the endpoint is operational, but the lack of documentation makes it difficult to know the exact request body format or response structure.","tags":[],"capabilities":["x402-payment","crypto-wallet-balance","link-token","base-network","usdc-settlement","pay-per-request","no-api-key"],"categories":["crypto","finance"],"synonyms":["LINK balance check","Chainlink wallet balance","crypto balance API","token balance lookup","wallet balance query","x402 crypto API","LINK token balance"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema provided; request body format is guessed","Response schema is unknown — example_response_json is null","The provider lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/LINK/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/LINK/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/call in USDC on Base), but there is zero documentation: no OpenAPI spec, no request/response schema, no examples. The request body and response format are entirely inferred. The docs pages return only a wallet-connect 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'0.02':12,28,71,127 '000':73 '20':72 '6':85 'Chainlink wallet balance' 'LINK balance check' 'LINK token balance' 'accept':157 'account':91 'address':154 'ai/ml':116 'analyt':115 'api':57,88,170 'attach':96 'avail':198 'balanc':4,20,39,149 'base':16,32,74,80 'base-network' 'bodi':230 'broader':50 'call':56,130 'caller':94 'categori':142 'chain':7,23 'chainlink':43 'challeng':205 'check':1,17 'confirm':212 'connect':178 'cost':70 'crawl':201 'crypto balance API' 'crypto-wallet-balance' 'data':114,119 'decim':86 'detail':185 'difficult':224 'doc':168 'document':163,221 'dozen':110 'endpoint':34,112,135,156,214 'exact':228 'exampl':197 'extrem':165 'fall':137 'financ':140 'finance/web3':118 'form':211 'format':231 'gate':62 'given':152 'header':100 'infer':117 'infrastructur':121 'json':162 'key':89 'know':226 'lack':219 'land':107 'like':144 'link':2,18,42,147 'link-token' 'list':109 'live':207 'lowpaymentfee.com':36,60 'make':222 'materi':202 'micropay':10,26 'network':81 'no-api-key' 'offer':58 'on-chain':5,21 'openapi':189 'oper':216 'page':108,173 'part':47 'pay':54 'pay-per-cal':53 'pay-per-request' 'payment':66,99 'per':13,29,55,129 'per-cal':128 'point':132 'post':158 'price':131,169 'prompt':180 'protocol':67 'provid':105 'readm':172 'render':175 'request':14,30,69,103,159,229 'request/response':192 'requir':93 'respons':233 'return':37,145,161 'schema':193 'simpli':95 'span':113 'spars':166 'spec':190 'specif':134 'structur':234 'suit':51 'technic':184 'token':148 'token balance lookup' 'unit':75 'usag':196 'usdc':77,83 'usdc-settlement' 'util':122 'via':8,24,63 'wallet':3,19,44,153,179 'wallet balance query' 'web3':141 'well':210 'well-form':209 'x402':9,25,65,98,204 'x402 crypto API' 'x402-payment'","prices":[{"id":"fca37a3a-8415-46c8-bd86-3af68746e13a","listingId":"0d4f3d0c-5637-4b1d-8238-6f42bac20aa8","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/LINK/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":"2026-04-18T19:28:19.047Z"}],"sources":[{"listingId":"0d4f3d0c-5637-4b1d-8238-6f42bac20aa8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/LINK/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:19.047Z","lastSeenAt":"2026-04-23T12:32:03.174Z"}],"details":{"listingId":"0d4f3d0c-5637-4b1d-8238-6f42bac20aa8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/LINK/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 HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/wallet/LINK/balance"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units of USDC with 6 decimals on Base)","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/LINK/balance"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying LINK token balances for a specific wallet address","Integrating on-chain LINK balance checks into automated trading or portfolio dashboards","Agent-driven wallet monitoring without needing API keys or accounts"],"bestFor":["Developers needing quick, keyless LINK balance lookups","AI agents that can settle x402 micropayments on Base","Low-volume or sporadic balance checks where $0.02/call is cost-effective"],"notFor":["High-frequency balance polling where per-call costs would accumulate quickly","Users who need detailed transaction history or multi-token balance queries in a single call","Anyone unable to settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.561Z"},"updatedAt":"2026-04-23T12:32:03.174Z"}}