x402-gated account balance endpoint on Base, paid per-request in USDC.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/68/balance` is gated behind a per-call USDC payment on the Base network. The x402 challenge confirms the endpoint is live, accepting POST requests and returning application/json responses.
The parent site lowpaymentfee.com hosts a broader catalog 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 with no API keys, no rate limits, and no minimum commitments. Payment settles in USDC on the Base L2 network.
For this specific endpoint, the x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02 per call. The endpoint uses the "exact" payment scheme with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found beyond the x402 challenge metadata and the landing page listing.
Capabilities
Use cases
- —Querying account balance data behind a micropayment wall
- —Integrating pay-per-call balance checks into agent workflows
- —Demonstrating x402 protocol payment flows on Base
Fit
Best for
- —Agents or services that need on-demand account balance data without subscription commitments
- —Developers experimenting with x402 micropayment-gated APIs
- —Automated workflows requiring low-cost, keyless API access
Not for
- —High-volume balance polling where per-request costs would accumulate significantly
- —Users who need detailed API documentation or guaranteed SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/68/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page, no example request/response bodies, and the specific purpose of the /accounts/68/balance resource is unclear. This is effectively a stub listing.
Warnings
- —No OpenAPI or detailed documentation available — endpoint behavior must be inferred from the x402 challenge metadata alone.
- —The specific meaning of 'accounts/68/balance' is undocumented; it is unclear what account ID 68 refers to or what the response contains.
- —Docs, API, pricing, and README pages all returned only a 'Connect wallet' prompt with no substantive content.
- —The broader site lists many endpoints but none have documented schemas or example payloads.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network with exact scheme and 300s timeout.https://lowpaymentfee.com/api/v1/accounts/68/balance
- —All endpoints on the site are listed at $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The site hosts APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories.https://lowpaymentfee.com