Check account balance via x402 micropayment on Base network for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides account balance information behind an x402 paywall. The specific resource `/api/v1/accounts/155/balance` accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (20,000 base units with 6 decimals). No API keys or rate limits are required — access is granted purely through the x402 payment protocol.
The provider lowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services. All endpoints are listed at $0.02 per request and use the same x402 payment mechanism on Base. However, the specific endpoint being listed here is the account balance lookup.
Documentation 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 balance response contains or what parameters the POST body expects. The endpoint is confirmed live (402 challenge captured), but the actual functionality and response format remain unclear.
Capabilities
Use cases
- —Querying account balance information programmatically with per-call USDC payment
- —Integrating balance lookups into agent workflows without managing API keys
- —Demonstrating x402 protocol micropayment flows on Base network
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless, pay-per-call account balance data
- —Projects already operating on Base network with USDC
Not for
- —Users needing detailed API documentation or response schema before integrating
- —High-volume balance queries where per-call pricing adds up
- —Anyone without a Base network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/155/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of the specific endpoint (account 155 balance) is unclear. Pricing is clear ($0.02/request in USDC on Base) but little else can be verified.
Warnings
- —No documentation available — all doc/API/pricing/README pages render only 'Connect wallet'
- —No OpenAPI or request/response schema provided; input parameters and output format are unknown
- —The specific endpoint references account ID 155 with no explanation of what this account represents
- —Cannot verify what data is actually returned upon successful payment
Citations
- —Endpoint returns 402 with x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/accounts/155/balance
- —maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02https://lowpaymentfee.com/api/v1/accounts/155/balance
- —All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Provider offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com