{"id":"098be589-2326-476b-b4aa-bfd618209290","shortId":"f9Z5bf","kind":"x402","title":"Check OP token wallet balance on Base via x402 micropayment — $0.02 per request in USDC.","tagline":"Check OP token wallet balance on Base via x402 micropayment — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com returns wallet balance information for the OP (Optimism) token. 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 on the platform use the x402 payment protocol, settling in USDC on the Base network at a flat rate of $0.02 per request.\n\nThe specific endpoint `/api/v1/wallet/OP/balance` accepts POST requests and returns JSON. Based on the URL structure, it likely expects a wallet address as input and returns the OP token balance for that address. The x402 challenge confirms the endpoint is live, advertising a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02. Payment is made to address 0x1A2B...85F3 on Base using the USDC contract 0x8335...2913.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed parameter documentation available. The endpoint's exact input format and response structure must be inferred from the URL pattern alone.","tags":[],"capabilities":["wallet-balance-query","op-token","x402-payment","usdc-settlement","base-network","pay-per-request","json-api"],"categories":["crypto","finance"],"synonyms":["OP balance check","Optimism token balance","wallet balance API","crypto balance lookup","OP wallet query","token balance endpoint"],"warnings":["No documentation available — all doc/pricing/API pages render only 'Connect wallet'","No OpenAPI or schema definition found","Request body format and response structure are inferred, not documented","The example_request_json is speculative based on URL pattern"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/OP/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/OP/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, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the input format is entirely inferred from the URL pattern. The endpoint's actual behavior and response structure are 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'0.02':11,26,93,150 '000':141 '0x1a2b':156 '0x8335':164 '20':140 '2913':165 '6':146 '85f3':157 'OP balance check' 'OP wallet query' 'Optimism token balance' 'accept':100 'address':116,127,155 'advertis':136 'ai/ml':65 'alon':221 'analyt':64 'api':56,175 'avail':204 'balanc':5,20,37,124 'base':7,22,86,106,142,159 'base-network' 'broader':49 'call':55 'challeng':130 'check':1,16 'confirm':131 'connect':184 'content':190 'contract':163 'crypto balance lookup' 'data':63 'decim':147 'detail':201 'doc':174 'document':166,203 'endpoint':32,72,98,133,206 'equal':149 'exact':208 'exampl':198 'expect':113 'extrem':171 'finance/web3':67 'flat':90 'format':210 'infer':66,216 'inform':38 'input':118,209 'json':105 'json-api' 'like':112 'live':135 'lowpaymentfee.com':34 'made':153 'maxamountrequir':138 'micropay':10,25 'must':214 'network':87 'offer':57 'op':2,17,41,122 'op-token' 'openapi':194 'optim':42 'page':179 'paramet':202 'part':46 'pattern':220 'pay':53 'pay-per-cal':52 'pay-per-request' 'payment':79,151 'per':12,27,54,94 'platform':75 'post':101 'price':176 'prompt':186 'protocol':80 'provid':61 'rate':91 'readm':178 'render':181 'request':13,28,95,102 'request/response':197 'respons':212 'return':35,104,120 'schema':195 'servic':70 'settl':81 'site':169 'span':62 'spars':172 'specif':97 'structur':110,213 'suit':50 'token':3,18,43,123 'token balance endpoint' 'unit':143 'url':109,219 'usdc':15,30,83,145,162 'usdc-settlement' 'use':76,160 'util':69 'via':8,23 'wallet':4,19,36,115,185 'wallet balance API' 'wallet-balance-query' 'x402':9,24,78,129 'x402-payment'","prices":[{"id":"0b7b9b11-34c1-4852-9466-844f5e773593","listingId":"098be589-2326-476b-b4aa-bfd618209290","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/OP/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":"2026-04-18T19:28:27.606Z"}],"sources":[{"listingId":"098be589-2326-476b-b4aa-bfd618209290","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/OP/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:27.606Z","lastSeenAt":"2026-04-23T09:31:50.385Z"}],"details":{"listingId":"098be589-2326-476b-b4aa-bfd618209290","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/OP/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\" \\\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 HTTP 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/OP/balance"},{"claim":"All APIs on the platform 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":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/OP/balance"}],"useCases":["Querying the OP token balance of a specific wallet address","Building portfolio trackers that need on-demand balance lookups","Automating balance checks in trading or DeFi workflows"],"bestFor":["Agents needing quick, keyless OP token balance lookups","Applications that prefer pay-per-call over subscription API keys","Developers building on Base who want x402-native payment flows"],"notFor":["Bulk or high-frequency balance polling (no documented rate limits but $0.02/call adds up)","Querying balances for tokens other than OP (endpoint is OP-specific)","Users who need detailed documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.206Z"},"updatedAt":"2026-04-23T09:31:50.385Z"}}