x402-gated account balance endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" account balance query via the x402 payment protocol. When called without payment, it returns a 402 challenge requiring a USDC payment on the Base network. The specific endpoint `/api/v1/accounts/59/balance` appears to return balance information for account ID 59, though the exact response schema is not documented.
The provider lowpaymentfee.com hosts a broader suite of x402-gated APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The probed endpoint's x402 challenge specifies a maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, 6 decimals), which equals $0.02 per call. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the "exact" scheme. The endpoint accepts POST requests and returns application/json. Documentation beyond the landing page is essentially empty — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content.
Capabilities
Use cases
- —Querying account balance data via a single paid API call
- —Integrating pay-per-use balance lookups into agent workflows
- —Demonstrating x402 payment protocol integration on Base
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing on-demand account balance queries without API key management
- —Low-volume, pay-as-you-go API consumption on Base
Not for
- —High-volume balance queries where per-call fees add up
- —Users who need detailed API documentation or response schema guarantees
- —Production systems requiring SLA or uptime guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/59/balance
# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof to get the actual response.Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation of request parameters, response schema, or what 'account 59 balance' actually returns. The docs, pricing, and README pages are all blank beyond a wallet connect prompt. This is effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages are empty
- —No response schema or example responses provided
- —Purpose of 'accounts/59/balance' endpoint is unclear — no description of what balance data is returned
- —Provider site appears to be a generic x402 demo platform; reliability and data quality are unknown
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/59/balance
- —All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/accounts/59/balance
- —The provider offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com