Check account balance via x402 micropayment on Base network for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides account balance information behind an x402 paywall. It is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint `/api/v1/accounts/126/balance` returns account balance data in JSON format. Payment is handled via the x402 protocol: callers include an X-PAYMENT header with a signed USDC payment of up to $0.02 (20,000 base units of USDC with 6 decimals) on Base. There are no API keys, no rate limits, and no signup required — access is granted purely through per-request micropayments.
The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas are not available from the crawl. The endpoint is live and returns a valid x402 challenge (HTTP 402) as expected.
Capabilities
Use cases
- —Querying account balance data programmatically with per-request USDC micropayments
- —Integrating balance lookups into agent workflows without managing API keys
- —Demonstrating x402 protocol payment flows on Base network
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —Agents that need keyless, pay-per-call API access on Base
- —Projects requiring low-friction account balance queries settled in USDC
Not for
- —Users who need free or subscription-based API access
- —Applications requiring detailed API documentation or OpenAPI schemas upfront
- —High-volume batch queries where per-request pricing may add up
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/126/balance \
-H "X-PAYMENT: <signed-x402-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documented request/response format, and the docs pages are gated behind wallet connection. The specific purpose of 'account 126 balance' is unclear — it may be a demo or placeholder. Very little can be verified about what the endpoint actually returns.
Warnings
- —No OpenAPI or request/response schema available; endpoint behavior must be inferred
- —Documentation pages require wallet connection and returned no useful content
- —The endpoint path references a specific account ID (126) — unclear if this is parameterizable or a fixed demo
- —The platform lists many endpoints but none have documented schemas; actual functionality is unverified
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring up to 20,000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/126/balance
- —The platform prices all APIs at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/accounts/126/balance