x402-gated premium API access on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific resource path `/api/v1/trades/168` suggests a trade-data or financial-data endpoint, though the exact response payload is not documented. The site hosts a broader suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.
Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge advertises a maxAmountRequired of 20000 base units, which at 6 decimals equals $0.02 USD — consistent with the site's stated pricing. The endpoint accepts POST requests and returns application/json. A 300-second payment timeout is allowed.
Documentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The specific behavior of the `/api/v1/trades/168` path (whether it returns a single trade record, aggregated trade data, or something else) cannot be determined from the available material.
Capabilities
Use cases
- —Fetching trade data or financial records on a per-request payment basis
- —Integrating pay-per-call data access into autonomous agents via x402
- —Accessing premium API content without traditional API key registration
Fit
Best for
- —Agents or applications that need keyless, pay-per-use API access
- —Developers experimenting with x402 micropayment protocols on Base
- —Use cases requiring low-friction access to trade or financial data
Not for
- —Users needing well-documented API schemas and response contracts before integration
- —High-volume consumers who need bulk pricing or subscription plans
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/168 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no request/response schema, no examples, and the specific purpose of /api/v1/trades/168 is unclear. The docs pages are empty beyond a wallet-connect prompt.
Warnings
- —No OpenAPI spec or request/response schema available
- —All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content
- —The specific behavior and response format of /api/v1/trades/168 is undocumented and cannot be verified
- —The endpoint path suggests trade data but no details confirm what data is returned
Citations
- —The site lists APIs at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge shows maxAmountRequired of 20000 base units in USDC on Base with 300-second timeouthttps://lowpaymentfee.com/api/v1/trades/168
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/168
- —Documentation pages render only a Connect wallet prompt with no further contenthttps://lowpaymentfee.com/docs