{"id":"81ecbf96-edd6-45c3-b832-1579fbc7785b","shortId":"RZkxbV","kind":"x402","title":"Query COMP token wallet balances via x402 micropayment on Base for $0.02 per request.","tagline":"Query COMP token wallet balances via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns COMP (Compound) token wallet balance data, paid per-request via the x402 protocol on the Base network. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call. Payment is settled on-chain with no API keys, no rate limits, and no upfront commitments required.\n\nThe endpoint is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request. The specific endpoint `/api/v1/wallet/COMP/balance` sits in the Finance & Web3 category and is accessed via HTTP POST with an `X-PAYMENT` header carrying the x402 payment proof.\n\nDocumentation on the site is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of required input parameters or output format beyond the generic \"Premium API Access\" label and `application/json` MIME type declared in the x402 challenge.","tags":[],"capabilities":["crypto-wallet-balance","comp-token","x402-micropayment","base-network","usdc-settlement","pay-per-request","no-api-key"],"categories":["crypto","finance"],"synonyms":["COMP balance API","Compound token balance","wallet balance lookup","crypto balance check","ERC-20 balance query","token balance endpoint"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no technical content.","No OpenAPI or JSON schema for request or response bodies; input parameters are unknown.","The example_request_json is entirely inferred and may not match the actual expected input.","Provider identity and reliability are unclear; no SLA or terms of service found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/COMP/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/COMP/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, no examples, and the site's docs/pricing/API pages are all blank beyond a wallet-connect prompt. The request and response formats are entirely 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'0.02':12,26,72,123 '000':61 '0x8335':66 '20':60 '2913':67 'COMP balance API' 'Compound token balance' 'ERC-20 balance query' 'access':138,201 'advertis':55 'ai/ml':113 'analyt':112 'api':83,106,164,200 'application/json':204 'balanc':5,19,38 'base':10,24,50,62,69 'base-network' 'beyond':196 'broader':99 'call':74,105 'carri':148 'categori':135 'chain':80 'challeng':54,211 'commit':91 'comp':2,16,34 'comp-token' 'compound':35 'connect':170 'cost':58 'crypto balance check' 'crypto-wallet-balance' 'data':39,111,116 'declar':207 'descript':188 'detail':177 'doc':161 'document':153 'endpoint':30,94,128 'equal':71 'exampl':185 'extrem':158 'financ':133 'finance/web3':115 'format':195 'generic':198 'header':147 'http':140 'infer':114 'input':191 'key':84 'label':202 'limit':87 'lowpaymentfee.com':32,109 'maximum':57 'micropay':8,22 'mime':205 'network':51 'no-api-key' 'offer':107 'on-chain':78 'openapi':181 'output':194 'page':165 'paid':40 'paramet':192 'part':96 'pay':103 'pay-per-cal':102 'pay-per-request' 'payment':75,146,151 'per':13,27,42,73,104,124 'per-request':41 'post':141 'premium':199 'price':121,162 'prompt':172 'proof':152 'protocol':47 'queri':1,15 'rate':86 'render':167 'request':14,28,43,125 'request/response':184 'requir':92,190 'return':33 'schema':182 'servic':119 'settl':77 'sit':130 'site':156 'span':110 'spars':159 'specif':127 'suit':100 'technic':176 'token':3,17,36 'token balance endpoint' 'type':206 'unit':63 'upfront':90 'usdc':65 'usdc-settlement' 'util':118 'via':6,20,44,139 'wallet':4,18,37,171 'wallet balance lookup' 'web3':134 'x':145 'x-payment':144 'x402':7,21,46,53,150,210 'x402-micropayment'","prices":[{"id":"9fabc066-35a7-4905-b391-6d0a036ab093","listingId":"81ecbf96-edd6-45c3-b832-1579fbc7785b","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/COMP/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":"2026-04-18T19:28:08.119Z"}],"sources":[{"listingId":"81ecbf96-edd6-45c3-b832-1579fbc7785b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/COMP/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:08.119Z","lastSeenAt":"2026-04-23T14:31:40.624Z"}],"details":{"listingId":"81ecbf96-edd6-45c3-b832-1579fbc7785b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/COMP/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\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 returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/COMP/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 site offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Checking COMP token balances for a given wallet address","Building portfolio dashboards that need real-time token holdings","Automated agents verifying COMP holdings before executing DeFi strategies","Monitoring wallet balances for alerting or compliance purposes"],"bestFor":["Agents needing on-demand COMP balance lookups without managing API keys","Developers who prefer pay-per-call crypto-settled APIs","Low-volume or bursty usage patterns where subscription pricing is wasteful"],"notFor":["High-frequency balance polling where $0.02/call adds up quickly","Users who need balances for many tokens in a single call (this is COMP-specific)","Anyone requiring detailed documentation or SLA guarantees before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.029Z"},"updatedAt":"2026-04-23T14:31:40.624Z"}}