Get SOL wallet balance via x402 micropayment — $0.02 per request on Base.
What it does
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.
The 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.
Documentation 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.
Capabilities
Use cases
- —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
Fit
Best for
- —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
Not for
- —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
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/SOL/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>" \
-d '{"address": "<SOLANA_WALLET_ADDRESS>"}'Example
Request
{
"address": "7xKXtg2CW87d97TXJSDpbD5jBkheTqA83TZRuJosgAsU"
}Endpoint
Quality
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 path.
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
Citations
- —Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/wallet/SOL/balance
- —All APIs on the platform cost $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/wallet/SOL/balance