Check account balance via x402 micropayment on Base network for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns account balance information for a specific account (ID 190) behind an x402 paywall. It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof. The x402 challenge confirms the endpoint is live, advertising a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are advertised; access is gated purely by micropayment.
Documentation is extremely sparse. The provider's docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The exact structure of the response (what fields the balance object contains) and whether the endpoint accepts any request body parameters are unknown. The endpoint path suggests it returns balance data for account 190, but the broader account system is not documented.
Capabilities
Use cases
- —Querying account balance information with per-call USDC micropayment
- —Integrating pay-per-use balance lookups into agent workflows without API key management
- —Demonstrating x402 protocol payment flows on Base network
Fit
Best for
- —Developers experimenting with x402 micropayment protocol
- —Agents needing keyless, pay-per-call account balance data
- —Projects that want to avoid subscription-based API billing
Not for
- —Production use requiring documented request/response schemas
- —High-volume balance polling where per-call costs add up
- —Users who need detailed API documentation or SDKs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/190/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The endpoint's actual functionality and output format are entirely unknown beyond the path name.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema for request or response bodies
- —The specific purpose of account 190 balance is undocumented; unclear if this is a demo or production endpoint
- —No information on error handling, response fields, or edge cases
Citations
- —The endpoint returns HTTP 402 with x402 challenge advertising maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/190/balance
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/190/balance