Query ENJ wallet balance on Base via x402 micropayment — $0.02 per request, no API key needed.
What it does
This endpoint at lowpaymentfee.com returns the wallet balance for ENJ (Enjin Coin) via a simple POST request, gated by the x402 payment protocol. Each call costs $0.02 (20,000 base units of USDC on Base network, which has 6 decimals). No API keys, accounts, or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the data.
The endpoint is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced uniformly at $0.02 per request. Payment settles on the Base L2 network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with the "exact" payment scheme. The x402 challenge was successfully captured, confirming the endpoint is live.
Documentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI schema, no example request/response payloads, and no description of what fields the balance response contains. The specific behavior of this endpoint (e.g., whether it requires a wallet address in the POST body or returns ENJ balance on a specific chain) must be inferred and is uncertain.
Capabilities
Use cases
- —Check ENJ token balance for a given wallet address
- —Integrate ENJ balance lookups into portfolio trackers or dashboards
- —Automate wallet monitoring for Enjin Coin holdings
- —Agent-driven crypto balance queries without API key management
Fit
Best for
- —Developers needing quick, keyless ENJ balance checks
- —AI agents that can settle x402 micropayments on Base
- —Low-volume or sporadic wallet balance queries where $0.02/call is economical
Not for
- —High-frequency balance polling where per-call costs add up quickly
- —Users who need detailed transaction history or multi-token portfolio data beyond a single balance
- —Anyone unable to settle USDC payments on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/ENJ/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>" \
-d '{"address": "0xYourWalletAddress"}'Example
Request
{
"address": "0x1234567890abcdef1234567890abcdef12345678"
}Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, and all documentation pages beyond the landing page are empty stubs. The request body and response structure are entirely inferred.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are guessed
- —All doc/pricing/README pages return only a 'Connect wallet' prompt with no content
- —Example request JSON is inferred and may not match actual expected input
- —Unclear whether this returns ENJ balance on a specific chain or across chains
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/wallet/ENJ/balance
- —Price is $0.02 per request (maxAmountRequired 20000 base units of USDC with 6 decimals on Base)https://lowpaymentfee.com/api/v1/wallet/ENJ/balance
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/wallet/ENJ/balance
- —No API keys, no rate limits, instant access advertisedhttps://lowpaymentfee.com
- —Uniform $0.02/request pricing across all endpointshttps://lowpaymentfee.com