{"id":"35c0ca22-f8a8-4799-b7de-ad0032dee230","shortId":"fCyACY","kind":"x402","title":"Query JST token wallet balances via x402 micropayment on Base for $0.02/request","tagline":"Query JST token wallet balances via x402 micropayment on Base for $0.02/request","description":"This endpoint at lowpaymentfee.com returns wallet balance information for the JST (JUST) token. It is part of a broader suite of pay-per-call APIs offered by the 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.\n\nThe specific endpoint `/api/v1/wallet/JST/balance` accepts POST requests and is gated by an x402 challenge requiring up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals). No API keys or account registration are needed — callers simply attach an X-PAYMENT header with a valid x402 payment proof. The provider advertises no rate limits and instant access.\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 technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The endpoint is confirmed live (returns HTTP 402 with a well-formed x402 challenge), but the actual response format for a successful paid call is unknown and must be inferred. Presumably it returns a JSON object containing the JST balance for a given wallet address, but the exact request body schema and response fields are undocumented.","tags":[],"capabilities":["wallet-balance-query","jst-token","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["crypto","finance"],"synonyms":["JST balance","JUST token balance","wallet balance API","crypto balance lookup","token balance check","Web3 wallet query","x402 crypto API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","Request body schema is unknown; the example request is speculative","Response schema is completely undocumented; example_response_json is null","No OpenAPI or machine-readable spec provided","The broader platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/JST/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/JST/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, but documentation is essentially nonexistent — no OpenAPI spec, no request/response schema, no examples. The request body format and response structure are entirely inferred. The provider landing page confirms pricing and general platform capabilities but offers no endpoint-specific 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'/request':13,26 '0.02':12,25,107 '000':101 '20':100 '402':190 '6':111 'JST balance' 'JUST token balance' 'Web3 wallet query' 'accept':87 'access':143 'account':117 'actual':200 'address':228 'advertis':137 'ai/ml':60 'analyt':59 'api':52,114,153 'attach':123 'balanc':5,18,33,223 'base':10,23,81,102 'base-network' 'bodi':233 'broader':45 'call':51,207 'caller':121 'challeng':96,197 'confirm':186 'connect':162 'contain':220 'crypto balance lookup' 'data':58 'decim':112 'detail':169 'doc':152 'document':144,178 'endpoint':28,67,85,184 'exact':231 'exampl':182 'extrem':149 'field':237 'finance/web3':62 'form':195 'format':202 'gate':92 'given':108,226 'header':128 'http':189 'i.e':106 'infer':61,213 'inform':34 'instant':142 'json':218 'jst':2,15,37,222 'jst-token' 'key':115 'limit':140 'live':187 'lowpaymentfee.com':30 'micropay':8,21 'must':211 'need':120 'network':82 'no-api-key' 'object':219 'offer':53 'openapi':173 'page':157 'paid':206 'part':42 'pay':49 'pay-per-cal':48 'pay-per-request' 'payment':74,127,133 'per':50 'platform':70 'post':88 'presum':214 'price':154 'prompt':164 'proof':134 'protocol':75 'provid':56,136 'queri':1,14 'rate':139 'readm':156 'registr':118 'render':159 'request':89,232 'request/response':176 'requir':97 'respons':201,236 'return':31,188,216 'schema':177,234 'servic':65 'settl':76 'simpli':122 'site':147 'span':57 'spars':150 'spec':174 'specif':84 'success':205 'suit':46 'technic':168 'token':3,16,39 'token balance check' 'undocu':239 'unit':103 'unknown':209 'usag':181 'usdc':78,105,109 'usdc-settlement' 'use':71 'util':64 'valid':131 'via':6,19 'wallet':4,17,32,163,227 'wallet balance API' 'wallet-balance-query' 'well':194 'well-form':193 'x':126 'x-payment':125 'x402':7,20,73,95,132,196 'x402 crypto API' 'x402-payment'","prices":[{"id":"7a163363-c8fa-4af5-bc5b-387102e515b4","listingId":"35c0ca22-f8a8-4799-b7de-ad0032dee230","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/JST/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":"2026-04-18T19:28:27.615Z"}],"sources":[{"listingId":"35c0ca22-f8a8-4799-b7de-ad0032dee230","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/JST/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:27.615Z","lastSeenAt":"2026-04-23T09:31:50.390Z"}],"details":{"listingId":"35c0ca22-f8a8-4799-b7de-ad0032dee230","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/JST/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 endpoint returns HTTP 402 with an x402 challenge requiring up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/JST/balance"},{"claim":"All endpoints on the platform cost $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/JST/balance"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Checking JST (JUST) token balances for a given wallet address","Integrating real-time token balance data into portfolio trackers or dashboards","Automated agents querying on-chain balances without needing API keys"],"bestFor":["Agents or apps needing quick, keyless JST balance lookups","Developers who prefer pay-per-call micropayments over subscription APIs","x402-compatible clients on the Base network"],"notFor":["Bulk historical balance queries (no documented batch or historical support)","Users needing detailed documentation or guaranteed SLAs","Querying balances for tokens other than JST on this specific endpoint"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.193Z"},"updatedAt":"2026-04-23T09:31:50.390Z"}}