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/90/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 broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with the same x402 payment model on Base. However, the specific endpoint being listed here is the account balance lookup at `/api/v1/accounts/90/balance`.
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 (returns a valid x402 402 challenge), but the actual functionality and response format remain unclear.
Capabilities
Use cases
- —Querying account balance data programmatically with per-call USDC payment
- —Integrating balance lookups into agent workflows without managing API keys
- —Demonstrating x402 protocol payment flows on Base network
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —Agents that need keyless, pay-per-call API access on Base
- —Quick balance lookups without subscription commitments
Not for
- —Production systems requiring well-documented, schema-validated APIs
- —High-volume balance queries where per-call pricing adds up
- —Users who need detailed documentation or support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/90/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and no meaningful documentation beyond a landing page listing. The actual functionality of this specific endpoint (account balance for account 90) is unexplained. This is effectively a stub listing.
Warnings
- —No OpenAPI schema or request/response documentation available
- —Docs, API, pricing, and README pages all render only 'Connect wallet' with no technical content
- —The purpose and response format of /api/v1/accounts/90/balance is not documented anywhere
- —The hardcoded account ID '90' in the path suggests this may be a demo or placeholder endpoint
- —Cannot verify what data is actually returned upon successful payment
Citations
- —Endpoint returns x402 402 challenge with maxAmountRequired of 20000 in USDC on Base networkhttps://lowpaymentfee.com/api/v1/accounts/90/balance
- —All APIs listed at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/accounts/90/balance