Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints on the platform are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.
The specific endpoint `/api/v1/payments/218` is labeled "Premium API Access" but its exact functionality is not documented beyond that title. The x402 challenge confirms it is live, accepts POST requests, and requires payment of up to 20,000 base units of USDC (0.02 USD) on Base (asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found for this specific endpoint; the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content.
Because the endpoint's actual functionality is unclear — it could be a generic payments endpoint, a demo, or a placeholder — users should treat this as a low-documentation offering. The platform itself appears to be a demonstration or early-stage x402 API marketplace.
Capabilities
Use cases
- —Testing x402 payment protocol integration with a low-cost endpoint
- —Demonstrating pay-per-request API consumption without API keys
- —Exploring Base-network USDC micropayment flows
Fit
Best for
- —Developers experimenting with x402 protocol payments
- —Agents needing a cheap test endpoint for x402 payment flows
- —Projects wanting keyless, pay-as-you-go API access on Base
Not for
- —Production workloads requiring well-documented API contracts and SLAs
- —Users who need detailed response schemas or guaranteed data quality
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/218 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example request/response, and the actual functionality behind 'Premium API Access' is undefined. The docs pages render only a wallet-connect prompt.
Warnings
- —Endpoint functionality is undocumented — 'Premium API Access' is the only description available
- —No OpenAPI schema, request parameters, or response format documented
- —Docs, pricing, and API pages all show only 'Connect wallet' with no usable content
- —This may be a demo or early-stage platform; treat with caution for production use
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/payments/218
- —All endpoints on the platform are priced at $0.02 per request with no API keys, rate limits, or commitmentshttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/payments/218