x402-gated account balance endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides an account balance lookup (account ID 70) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all settled on the Base network using USDC via the x402 protocol.
The specific endpoint `/api/v1/accounts/70/balance` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body the POST expects or what shape the balance response takes. The platform appears to be a demonstration or early-stage deployment of x402-based API monetization.
Capabilities
Use cases
- —Querying account balance data via a single paid API call
- —Demonstrating x402 protocol payment flows on Base
- —Integrating pay-per-request balance lookups into agent workflows
Fit
Best for
- —Developers experimenting with x402 protocol integrations
- —Agents needing simple pay-per-call balance queries without API key management
- —Testing USDC micropayment flows on Base
Not for
- —Production use requiring documented request/response schemas
- —High-volume balance queries where per-call pricing is inefficient
- —Users who need detailed API documentation before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/70/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty stubs. The purpose of this specific endpoint (account 70 balance) is unclear beyond its URL path. Effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content
- —No OpenAPI or schema definition for request body or response format
- —Purpose of 'account 70 balance' is undocumented — unclear what data is returned
- —Platform appears to be early-stage or a demo; reliability and longevity are unknown
Citations
- —Uniform $0.02/request pricing, no API keys, no rate limits, Base network settlementhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/70/balance
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/accounts/70/balance