{"id":"e16e50f4-0f8f-4f3c-b363-05adca6eddba","shortId":"ZGBrur","kind":"x402","title":"Check MATIC wallet balances via x402 micropayment on Base for $0.02 per request.","tagline":"Check MATIC wallet balances via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns MATIC wallet balance data, accessible through the x402 payment protocol. 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 share a uniform $0.02-per-request pricing model settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/wallet/MATIC/balance` accepts POST requests and returns JSON. Payment is handled via the x402 exact-payment scheme: callers attach an `X-PAYMENT` header with a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the provider's address on Base. No API keys, accounts, or rate limits are advertised — access is purely payment-gated.\n\nDocumentation beyond the landing page is extremely sparse. The /docs, /pricing, /api, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but the actual behavior, required request body fields, and response format are unknown.","tags":[],"capabilities":["wallet-balance","matic-balance","x402-payment","usdc-settlement","base-network","pay-per-request","json-api"],"categories":["crypto","finance"],"synonyms":["MATIC balance API","Polygon wallet balance","crypto wallet balance check","x402 wallet API","micropayment API","MATIC balance lookup"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All doc/pricing/README pages return only a 'Connect wallet' stub with no content","Example request JSON is speculative; actual required fields are undocumented","The broader platform lists many endpoints but none have detailed docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/MATIC/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/MATIC/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 with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and all documentation pages are empty stubs. The request body and response format are entirely 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'/api/v1/wallet/matic/balance':93 '/docs':167 '/pricing':168 '/readme':171 '0.02':11,24,77,130 '000':126 '20':125 '402':211 '6':134 'MATIC balance API' 'MATIC balance lookup' 'Polygon wallet balance' 'accept':94 'access':36,152 'account':146 'actual':215 'addit':183 'address':140 'advertis':151 'ai/ml':63 'analyt':62 'api':54,144 'attach':111 'avail':198 'balanc':4,17,34 'base':9,22,88,127,142 'base-network' 'behavior':216 'beyond':159 'bodi':219 'broader':47 'call':53 'caller':110 'challeng':212 'check':1,14 'confirm':206 'connect':178 'crawl':201 'crypto wallet balance check' 'data':35,61 'decim':135 'detail':185 'document':158 'endpoint':28,70,92,204 'exact':107 'exact-pay':106 'exampl':197 'extrem':164 'field':220 'finance/web3':65 'format':223 'gate':157 'handl':102 'header':116 'i.e':129 'infer':64 'json':99 'json-api' 'key':145 'land':161 'limit':149 'live':207 'lowpaymentfee.com':30 'materi':202 'matic':2,15,32 'matic-balance' 'micropay':7,20 'micropayment API' 'minim':177 'model':82 'network':89 'offer':55 'openapi':189 'page':162,172 'part':44 'pay':51 'pay-per-cal':50 'pay-per-request' 'payment':40,100,108,115,121,156 'payment-g':155 'per':12,25,52,79 'per-request':78 'platform':73 'post':95 'price':81 'prompt':180 'proper':210 'protocol':41 'provid':59,138 'pure':154 'rate':148 'request':13,26,80,96,218 'request/response':192 'requir':217 'resolv':174 'respons':222 'return':31,98,208 'schema':193 'scheme':109 'servic':68 'settl':83 'share':74 'sign':119 'sinc':131 'span':60 'spars':165 'spec':190 'specif':91 'suit':48 'technic':184 'uniform':76 'unit':128 'unknown':225 'usag':196 'usdc':85,120,132 'usdc-settlement' 'use':133 'util':67 'via':5,18,103 'wallet':3,16,33,179 'wallet-balance' 'x':114 'x-payment':113 'x402':6,19,39,105 'x402 wallet API' 'x402-payment'","prices":[{"id":"dbfed35c-342f-428e-b641-4b203da09416","listingId":"e16e50f4-0f8f-4f3c-b363-05adca6eddba","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/MATIC/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":"2026-04-18T19:28:20.275Z"}],"sources":[{"listingId":"e16e50f4-0f8f-4f3c-b363-05adca6eddba","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/MATIC/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:20.275Z","lastSeenAt":"2026-04-23T12:32:03.237Z"}],"details":{"listingId":"e16e50f4-0f8f-4f3c-b363-05adca6eddba","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/MATIC/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-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":"Endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/MATIC/balance"},{"claim":"All APIs on the platform are priced at $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/MATIC/balance"}],"useCases":["Querying MATIC token balances for a given wallet address","Integrating wallet balance checks into automated trading or portfolio bots","Agent-driven on-chain balance monitoring without API key management"],"bestFor":["Agents needing quick, keyless MATIC balance lookups","Developers who prefer pay-per-call over subscription API plans","x402-native workflows on the Base network"],"notFor":["High-volume balance polling where $0.02/request adds up quickly","Users who need detailed transaction history or multi-token queries","Anyone requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.55Z"},"updatedAt":"2026-04-23T12:32:03.237Z"}}