{"id":"f6fa50c2-c295-4873-b867-9ea3b86b236f","shortId":"An4TSN","kind":"x402","title":"Check DAI wallet balances on Base via x402 micropayment — $0.02 per request in USDC.","tagline":"Check DAI wallet balances on Base via x402 micropayment — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com returns DAI wallet balance information, 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 data, 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/DAI/balance` accepts POST requests and returns JSON. Payment is handled via the x402 exact-payment scheme: callers attach an X-PAYMENT header with a USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the payTo address on Base. No API keys or account registration are required — access is granted purely through on-chain micropayment. The x402 challenge confirms the endpoint is live and responding with a version-1 402 challenge.\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. The exact request body format and response structure for the wallet balance endpoint are unknown and must be discovered experimentally.","tags":[],"capabilities":["dai-wallet-balance","x402-micropayment","usdc-payment","base-network","pay-per-request","no-api-key","crypto-balance-lookup"],"categories":["finance","web3"],"synonyms":["DAI balance check","wallet balance API","crypto balance lookup","DAI token balance","ERC-20 balance","Base network wallet","x402 wallet API"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown and must be guessed","All doc pages (/docs, /pricing, /api, /README) return only 'Connect wallet' with no content","The example_request_json is speculative; actual required fields are undocumented","Provider offers many endpoints but none have published technical documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/DAI/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/DAI/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). However, there is no OpenAPI spec, no documented request/response schema, no examples, and all documentation pages return only a wallet-connect prompt. The request body and response format are entirely 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'/api':188 '/api/v1/wallet/dai/balance':96 '/docs':186 '/pricing':187 '/readme':190 '0.02':10,24,80,132 '000':128 '20':127 '402':175 '6':136 'Base network wallet' 'DAI balance check' 'DAI token balance' 'ERC-20 balance' 'accept':97 'access':38,152 'account':148 'addit':202 'address':141 'ai/ml':65 'analyt':64 'api':56,145 'attach':114 'balanc':4,18,36,228 'base':6,20,91,129,143 'base-network' 'beyond':178 'bodi':220 'broader':49 'call':55 'caller':113 'chain':159 'challeng':163,176 'check':1,15 'confirm':164 'connect':197 'crypto balance lookup' 'crypto-balance-lookup' 'dai':2,16,34 'dai-wallet-balance' 'data':63,68 'decim':137 'detail':204 'discov':235 'document':177 'endpoint':30,73,95,166,229 'exact':110,218 'exact-pay':109 'exampl':216 'experiment':236 'extrem':183 'finance/web3':67 'format':221 'grant':154 'handl':105 'header':119 'i.e':131 'infer':66 'inform':37 'json':102 'key':146 'land':180 'live':168 'lowpaymentfee.com':32 'micropay':9,23,160 'minim':196 'model':85 'must':233 'network':92 'no-api-key' 'offer':57 'on-chain':157 'openapi':208 'page':181,191 'part':46 'pay':53 'pay-per-cal':52 'pay-per-request' 'payment':42,103,111,118,123 'payto':140 'per':11,25,54,82 'per-request':81 'platform':76 'post':98 'price':84 'prompt':199 'protocol':43 'provid':61 'pure':155 'registr':149 'request':12,26,83,99,219 'request/response':211 'requir':151 'resolv':193 'respond':170 'respons':223 'return':33,101 'schema':212 'scheme':112 'servic':71 'settl':86 'share':77 'sinc':133 'span':62 'spars':184 'spec':209 'specif':94 'structur':224 'suit':50 'technic':203 'uniform':79 'unit':130 'unknown':231 'usag':215 'usdc':14,28,88,122,134 'usdc-payment' 'use':135 'util':70 'version':173 'via':7,21,106 'wallet':3,17,35,198,227 'wallet balance API' 'x':117 'x-payment':116 'x402':8,22,41,108,162 'x402 wallet API' 'x402-micropayment'","prices":[{"id":"fc20d83c-797c-491c-b0df-bea8fa326ecc","listingId":"f6fa50c2-c295-4873-b867-9ea3b86b236f","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/DAI/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":"2026-04-18T19:28:08.695Z"}],"sources":[{"listingId":"f6fa50c2-c295-4873-b867-9ea3b86b236f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/DAI/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:08.695Z","lastSeenAt":"2026-04-23T00:32:31.349Z"}],"details":{"listingId":"f6fa50c2-c295-4873-b867-9ea3b86b236f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/DAI/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 a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/DAI/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 address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/DAI/balance"}],"useCases":["Querying DAI token balances for a given wallet address on-chain","Integrating wallet balance checks into automated trading or portfolio dashboards","Agent-driven balance verification before executing DeFi transactions"],"bestFor":["Developers needing quick, keyless DAI balance lookups","AI agents that can settle USDC micropayments on Base","Applications requiring pay-per-call crypto data without subscriptions"],"notFor":["High-volume balance polling where $0.02/request adds up quickly","Users who need detailed transaction history or multi-token queries in a single call","Anyone without a Base-network USDC wallet for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.029Z"},"updatedAt":"2026-04-23T00:32:31.349Z"}}