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/147/balance` is described as "Premium API Access" and returns JSON data upon payment. It accepts POST requests and settles payments in USDC on the Base network.
The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The provider's landing page confirms a flat $0.02/request pricing model across all their endpoints, with no API keys, no rate limits, and instant access. The endpoint is live and returns a proper 402 challenge with x402 version 1.
lowpaymentfee.com hosts a broader suite of APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints share the same $0.02 per-request pricing. However, this specific listing covers only the `/api/v1/accounts/147/balance` endpoint. Documentation beyond the landing page is sparse — the docs, API, pricing, and README pages all appear to require wallet connection and contain no substantive content.
Capabilities
Use cases
- —Querying account balance data with per-call USDC micropayments
- —Integrating balance checks into agent workflows without API key management
- —Programmatic access to account information via x402 payment protocol
Fit
Best for
- —Agents or bots that need on-demand account balance data without subscription commitments
- —Developers exploring x402 pay-per-call patterns on Base
- —Low-volume or sporadic balance lookups where flat per-request pricing is economical
Not for
- —High-volume balance queries where subscription pricing would be cheaper
- —Users who need detailed documentation or OpenAPI schemas before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/147/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no documentation beyond a landing page, no example request/response bodies, and the purpose of 'account 147 balance' is entirely opaque. The docs/pricing/README pages are all blank (wallet-gated). This is effectively a stub listing.
Warnings
- —No OpenAPI or detailed schema available for this endpoint
- —Documentation pages (docs, API, pricing, README) are all gated behind wallet connection and contain no visible content
- —The meaning of 'accounts/147/balance' is unclear — it is unknown what account 147 refers to or what data is returned
- —No example responses are available to verify the output format
Citations
- —The endpoint returns a 402 challenge with x402 version 1, accepting USDC on Base with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/accounts/147/balance
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/147/balance