{"id":"e0ee65c9-ceed-47c4-af0d-a5ee125b6ab1","shortId":"n32Kea","kind":"x402","title":"Get SOL wallet balance via x402 micropayment — $0.02 per request on Base.","tagline":"Get SOL wallet balance via x402 micropayment — $0.02 per request on Base.","description":"This endpoint returns the balance of a Solana (SOL) wallet, accessible through the x402 payment protocol. It is part of a broader suite of APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints on the platform share a uniform pricing model of $0.02 per request, settled in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint at `/api/v1/wallet/SOL/balance` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, advertising a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 `exact` scheme to the specified payTo address, with a 300-second timeout.\n\nDocumentation on the site is extremely thin — 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, and no usage examples available from the crawled material. The endpoint's behavior (what parameters it accepts, what fields it returns) must be inferred from the URL path alone.","tags":[],"capabilities":["solana-wallet-balance","x402-micropayment","usdc-base-settlement","per-request-pricing","no-api-key"],"categories":["crypto","finance"],"synonyms":["SOL balance check","Solana wallet balance API","crypto balance lookup","x402 Solana API","micropayment wallet API","SOL balance endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages all show only a wallet-connect prompt","No OpenAPI or JSON schema provided; request and response formats are unknown","Example request JSON is speculative — the actual required fields are undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/SOL/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/SOL/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty stubs. The endpoint's exact input parameters and response format are entirely inferred from the URL 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'0.02':8,20,73,128 '000':117 '0x8335':122 '20':116 '2913':123 '300':149 '6':132 'SOL balance check' 'SOL balance endpoint' 'Solana wallet balance API' 'accept':97,202 'access':35 'address':146 'advertis':111 'ai/ml':56 'alon':214 'amount':114 'analyt':55 'api':49,85,161 'avail':190 'balanc':4,16,29 'base':12,24,81,118,125 'behavior':198 'broader':46 'challeng':105 'commit':90 'confirm':106 'connect':170 'crawl':193 'crypto balance lookup' 'data':54 'decim':133 'detail':177 'doc':160 'document':152 'endpoint':26,63,94,108,196 'equal':127 'exact':140 'exampl':189 'extrem':157 'field':204 'finance/web3':58 'get':1,13 'given':129 'infer':57,209 'infrastructur':60 'json':102 'key':86 'limit':88 'live':110 'lowpaymentfee.com':52 'made':136 'materi':194 'max':113 'micropay':7,19 'micropayment wallet API' 'model':71 'must':207 'network':82 'no-api-key' 'offer':50 'openapi':181 'page':165 'paramet':200 'part':43 'path':213 'payment':39,134 'payto':145 'per':9,21,74 'per-request-pricing' 'platform':66 'post':98 'price':70,162 'prompt':172 'protocol':40 'rate':87 'readm':164 'render':167 'request':10,22,75,99 'request/response':184 'requir':91 'return':27,101,206 'schema':185 'scheme':141 'second':150 'settl':76 'share':67 'site':155 'sol':2,14,33 'solana':32 'solana-wallet-balance' 'span':53 'spec':182 'specif':93 'specifi':144 'suit':47 'technic':176 'thin':158 'timeout':151 'uniform':69 'unit':119 'url':212 'usag':188 'usdc':78,121,130 'usdc-base-settlement' 'util':61 'via':5,17,137 'wallet':3,15,34,171 'x402':6,18,38,104,139 'x402 Solana API' 'x402-micropayment'","prices":[{"id":"01b1b401-1914-48dc-b46e-0740dffefec1","listingId":"e0ee65c9-ceed-47c4-af0d-a5ee125b6ab1","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/SOL/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":"2026-04-18T19:28:25.816Z"}],"sources":[{"listingId":"e0ee65c9-ceed-47c4-af0d-a5ee125b6ab1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/SOL/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:25.816Z","lastSeenAt":"2026-04-23T11:04:02.765Z"}],"details":{"listingId":"e0ee65c9-ceed-47c4-af0d-a5ee125b6ab1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/SOL/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{\"address\": \"<SOLANA_WALLET_ADDRESS>\"}'","exampleRequest":{"address":"7xKXtg2CW87d97TXJSDpbD5jBkheTqA83TZRuJosgAsU"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/SOL/balance"},{"claim":"All APIs on the platform cost $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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wallet/SOL/balance"}],"useCases":["Checking the SOL balance of a Solana wallet address programmatically","Integrating real-time Solana balance data into dashboards or bots","Agent-driven portfolio monitoring that pays per query with no subscription"],"bestFor":["Agents or apps needing on-demand SOL balance lookups without API key management","Low-volume or sporadic queries where per-call pricing is more economical than a subscription","x402-native workflows that settle payments in USDC on Base"],"notFor":["High-frequency balance polling where per-request costs would accumulate quickly","Users who need detailed Solana transaction history or token account enumeration beyond simple SOL balance","Developers who require comprehensive API documentation and typed schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.306Z"},"updatedAt":"2026-04-23T11:04:02.765Z"}}