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 via the x402 payment protocol. The specific resource `/api/v1/accounts/16/balance` is described as "Premium API Access" and accepts POST requests. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).
The broader lowpaymentfee.com platform advertises a 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 with no API keys, no rate limits, and no minimum commitments required.
However, the specific endpoint being listed here — `/api/v1/accounts/16/balance` — is not among the publicly documented API categories on the landing page. Its exact response schema and purpose are unclear beyond the generic "Premium API Access" label. Documentation pages (/docs, /pricing, /README) returned only a wallet-connect prompt with no substantive content. Without an OpenAPI spec or response examples, the actual data returned by this endpoint cannot be confirmed.
Capabilities
Use cases
- —Querying account balance data via a single paid API call
- —Integrating pay-per-use balance lookups into agent workflows
- —Demonstrating x402 protocol payment flows on Base
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing no-auth, pay-per-call API access on Base
- —Low-volume, on-demand account balance queries
Not for
- —High-volume balance monitoring requiring subscription pricing
- —Users who need detailed API documentation and response schemas before integrating
- —Production systems requiring guaranteed SLAs and support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/16/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge), but there is no OpenAPI spec, no response schema, no documentation beyond a wallet-connect stub, and the specific endpoint path (/api/v1/accounts/16/balance) is not listed among the platform's advertised APIs. The purpose and output of this endpoint are essentially unknown.
Warnings
- —The endpoint /api/v1/accounts/16/balance is not listed among the platform's publicly advertised APIs — its purpose is unclear.
- —All documentation pages (/docs, /pricing, /README, /api) returned only a wallet-connect prompt with no substantive content.
- —No OpenAPI spec or response schema is available; the actual response format is unknown.
- —The endpoint path includes a hardcoded account ID (16), suggesting it may be specific to a single account rather than a general-purpose API.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02 per request.https://lowpaymentfee.com/api/v1/accounts/16/balance
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The platform lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories.https://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /README) returned only a wallet-connect prompt.https://lowpaymentfee.com/docs