x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol on the Base network. It is one of many endpoints offered by the provider, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform share a uniform pricing model of $0.02 per request, settled in USDC on Base with no API keys, rate limits, or commitments required.
The specific endpoint `/api/v1/charges/228` is labeled "Premium API Access" but the crawled material does not clarify what data or functionality this particular charge ID returns — it is not listed among the named endpoints on the homepage. The x402 challenge confirms the endpoint is live, accepting POST requests, and requires a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The provider's documentation pages (/docs, /pricing, /api, /README) all render only a "Connect wallet" prompt with no further technical documentation, so the request/response schema for this endpoint is unknown. Without documentation on what this endpoint actually returns, agents should treat this as a low-information listing.
Capabilities
Use cases
- —Programmatic access to a premium API resource with per-call USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment flows
- —Agents that can settle USDC on Base for per-request access
- —Users who want no-signup, no-API-key access to paid endpoints
Not for
- —Users who need detailed documentation or known response schemas before integrating
- —High-volume use cases where $0.02/request adds up without bulk discounts
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/228 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, the specific functionality behind /api/v1/charges/228 is undocumented — it does not appear in the homepage listing, and all doc pages render only 'Connect wallet'. No request or response schema is available, making this effectively a stub listing.
Warnings
- —The endpoint path /api/v1/charges/228 is not listed among the provider's named APIs; its actual functionality is unknown.
- —All documentation pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no technical content.
- —No request body schema or response schema is documented or inferable.
- —The 'Premium API Access' label is generic and does not describe what the endpoint does.
Citations
- —The provider lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.https://lowpaymentfee.com
- —Pricing is $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The x402 challenge confirms the endpoint is live, accepting POST, with maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.https://lowpaymentfee.com/api/v1/charges/228
- —Documentation pages render only a 'Connect wallet' prompt with no further content.https://lowpaymentfee.com/docs