x402-gated account balance endpoint on Base, paying $0.02 per request in 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/74/balance` is described by the provider as "Premium API Access" and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum charge of 20,000 base units (i.e., $0.02 per request, since USDC uses 6 decimals).
The provider's landing page advertises a broader suite of endpoints spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, the specific endpoint being listed here is the account balance resource, and no documentation beyond the landing page was available (docs, API reference, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content).
Because there is no OpenAPI schema, no request/response examples, and no detailed documentation for this endpoint, the actual data returned by `/api/v1/accounts/74/balance` is unknown. The x402 challenge was successfully captured (HTTP 402 with a well-formed accepts array), confirming the endpoint is live and correctly advertising its payment terms.
Capabilities
Use cases
- —Querying account balance data with per-request USDC micropayments
- —Integrating x402-compatible agents that pay for API calls on Base
- —Accessing premium data without traditional API key provisioning
Fit
Best for
- —Agents or apps that already support x402 payment protocol
- —Users who want pay-per-use access without subscriptions or API keys
- —Developers experimenting with crypto-native micropayment APIs on Base
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-volume consumers who prefer flat-rate or subscription pricing
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/74/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint exists and its pricing. However, there is no OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect prompt with no content. The purpose of this specific endpoint (account 74 balance) is unclear beyond its generic title.
Warnings
- —No API documentation available — docs, API, pricing, and README pages all returned only 'Connect wallet' with no substantive content.
- —The specific data returned by /api/v1/accounts/74/balance is undocumented; request body format and response schema are unknown.
- —The endpoint path references a hardcoded account ID (74), suggesting it may be a demo or single-purpose resource rather than a general-purpose API.
Citations
- —The endpoint returns HTTP 402 with x402 version 1 challenge advertising USDC on Base with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/accounts/74/balance
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/74/balance
- —Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Provider lists additional endpoints for analytics, AI/ML, finance, and infrastructure utilitieshttps://lowpaymentfee.com