{"id":"1516d9df-e146-4f9a-ac47-68bf99003a85","shortId":"kpMQDQ","kind":"x402","title":"Query MINA wallet balances via x402 micropayment on Base for $0.02 per request.","tagline":"Query MINA wallet balances via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns MINA cryptocurrency wallet balance data, payable per-request via the x402 protocol on the Base network using USDC. The specific resource is `/api/v1/wallet/MINA/balance`, accepting POST requests. Each call costs a maximum of $0.02 (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — payment is handled inline via the X-PAYMENT header.\n\nThe provider, lowpaymentfee.com, offers a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request and settled on the Base network. However, the specific wallet balance endpoint probed here is not explicitly listed on the provider's landing page catalog (which focuses on analytics, AI, finance, and utility endpoints). The endpoint is live and returns a valid x402 challenge (HTTP 402) with USDC payment details.\n\nDocumentation 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 schema, no request/response examples, and no description of what fields the MINA balance response contains. Users should expect to experiment or contact the provider for integration details.","tags":[],"capabilities":["mina-wallet-balance","x402-payment","usdc-base-network","per-request-billing","no-api-key","crypto-balance-query"],"categories":["crypto","finance"],"synonyms":["MINA balance API","MINA wallet lookup","cryptocurrency balance check","Mina Protocol balance","x402 crypto API","pay-per-call wallet API","Base USDC micropayment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition for this endpoint; request/response structure is unknown.","The /api/v1/wallet/MINA/balance endpoint is not listed in the provider's public API catalog, raising questions about its support status.","Example request JSON is speculative — actual required fields are undocumented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/MINA/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/MINA/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no response examples, and the specific MINA balance endpoint is not even listed on the provider's own landing page. Request and response formats are entirely 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'0.02':11,24,65,118 '000':67 '20':66 '402':166 '6':73 'Base USDC micropayment API' 'MINA balance API' 'MINA wallet lookup' 'Mina Protocol balance' 'accept':56 'ai':150 'ai/ml':109 'analyt':108,149 'api':76,105,177 'balanc':4,17,35,131,210 'base':9,22,47,68,125 'broad':98 'call':60,104 'catalog':99,145 'challeng':164 'connect':186 'contact':219 'contain':212 'cost':61 'crypto-balance-query' 'cryptocurr':33 'cryptocurrency balance check' 'data':36,107 'decim':74 'descript':204 'detail':170,193,224 'doc':176 'document':171 'endpoint':28,132,154,156 'exampl':201 'expect':215 'experi':217 'explicit':137 'extrem':173 'field':207 'financ':151 'finance/web3':111 'focus':147 'handl':85 'header':92 'howev':127 'http':165 'infer':110 'infrastructur':113 'inlin':86 'integr':223 'key':77 'land':143 'limit':80 'list':138 'live':158 'lowpaymentfee.com':30,95 'maximum':63 'micropay':7,20 'mina':2,15,32,209 'mina-wallet-balance' 'network':48,126 'no-api-key' 'offer':96 'openapi':197 'page':144,181 'pay':102 'pay-per-cal':101 'pay-per-call wallet API' 'payabl':37 'payment':83,91,169 'per':12,25,39,103,119 'per-request':38 'per-request-billing' 'post':57 'price':116,178 'probe':133 'prompt':188 'protocol':44 'provid':94,141,221 'queri':1,14 'rate':79 'readm':180 'render':183 'request':13,26,40,58,120 'request/response':200 'requir':82 'resourc':53 'respons':211 'return':31,160 'schema':198 'settl':122 'span':106 'spars':174 'specif':52,129 'technic':192 'unit':69 'usdc':50,71,168 'usdc-base-network' 'use':49 'user':213 'util':114,153 'valid':162 'via':5,18,41,87 'wallet':3,16,34,130,187 'x':90 'x-payment':89 'x402':6,19,43,163 'x402 crypto API' 'x402-payment'","prices":[{"id":"0c6215fe-64d0-4f41-9c43-1ad87fbc528c","listingId":"1516d9df-e146-4f9a-ac47-68bf99003a85","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/MINA/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":"2026-04-18T19:28:23.950Z"}],"sources":[{"listingId":"1516d9df-e146-4f9a-ac47-68bf99003a85","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/MINA/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:23.950Z","lastSeenAt":"2026-04-23T11:04:02.683Z"}],"details":{"listingId":"1516d9df-e146-4f9a-ac47-68bf99003a85","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/MINA/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{\"address\": \"B62q...\"}'","exampleRequest":{"address":"B62qrPN5Y5yq8kGE3FbVKbGTdTAJvZiijRsXIPYYhvQ6e7cS5EHBM3F"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/MINA/balance"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/wallet/MINA/balance"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying MINA token balances for a given wallet address","Building portfolio trackers that need on-demand MINA balance lookups","Integrating MINA balance checks into automated trading or alerting bots"],"bestFor":["Agents or apps needing on-demand MINA wallet balance without managing API keys","Developers who prefer pay-per-call pricing with no subscription commitment","x402-compatible agents settling micropayments on Base"],"notFor":["Bulk or high-frequency balance polling where per-request costs add up","Users who need detailed MINA transaction history or staking data (not indicated as supported)","Anyone requiring comprehensive documentation or SLA guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.323Z"},"updatedAt":"2026-04-23T11:04:02.683Z"}}