x402-gated account balance endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com exposes an account balance resource at `/api/v1/accounts/79/balance` behind the x402 payment protocol. It accepts POST requests and returns JSON. 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). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The provider, lowpaymentfee.com, hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services (geocoding, validation, conversion, generation), all priced at $0.02 per request. However, this specific listing covers only the `/api/v1/accounts/79/balance` endpoint. The exact semantics of "account 79 balance" are not documented — it may return a financial account balance, a wallet balance, or similar structured data. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl.
The endpoint is live and returned a proper 402 challenge when probed. The x402 challenge specifies version 1, the "exact" payment scheme, and a 300-second payment timeout. The output schema indicates it is discoverable and accepts HTTP POST.
Capabilities
Use cases
- —Querying an account balance via a single paid API call
- —Integrating pay-per-call balance lookups into agent workflows
- —Demonstrating x402 protocol payment flows on Base
Fit
Best for
- —Agents or services that need on-demand account balance data without API key management
- —Developers experimenting with x402 micropayment-gated APIs
- —Automated workflows requiring low-friction, per-call payment
Not for
- —High-volume balance polling where $0.02/request adds up quickly
- —Use cases requiring detailed documentation or guaranteed SLAs
- —Users who need free or subscription-based access
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/79/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page listing, and the purpose of 'accounts/79/balance' is unclear. This is effectively a stub listing.
Warnings
- —No documentation found — /docs, /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no content.
- —The exact meaning of 'accounts/79/balance' is undocumented; the resource semantics are unknown.
- —No request body schema or response schema available; callers must discover behavior empirically.
- —No OpenAPI or ai-plugin manifest detected.
Citations
- —The endpoint returns a 402 challenge with x402 version 1, exact scheme, on Base network using USDC at max 20000 base units.https://lowpaymentfee.com/api/v1/accounts/79/balance
- —USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, making 20000 base units equal to $0.02.https://lowpaymentfee.com/api/v1/accounts/79/balance
- —The provider lists all APIs at $0.02/request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The provider offers additional endpoints for analytics, AI/ML, finance, and utility services.https://lowpaymentfee.com