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 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 the Base network with no API keys, rate limits, or commitments required.
The specific endpoint `/api/v1/payments/219` is labeled "Premium API Access" but the crawled material does not clarify what data or functionality this particular path returns — it is not listed among the provider's publicly advertised API catalog (which covers analytics, AI inference, finance, and utility endpoints). The x402 challenge confirms the endpoint is live, accepts POST requests, charges a maximum of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals), and pays out to a specified Ethereum address on Base.
Because the docs pages, pricing page, and README all returned only a "Connect wallet" stub with no further documentation, there is no schema, example request/response, or detailed description available for this specific endpoint. Agents should treat this as a generic pay-per-call x402 endpoint whose actual response payload is unknown without making a paid request.
Capabilities
Use cases
- —Programmatic access to premium API functionality with per-call USDC micropayments
- —Agent-driven workflows that need keyless, on-demand API access settled on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —AI agents that can settle USDC micropayments on Base
- —Users who want no-commitment, no-signup API access
Not for
- —Users who need detailed API documentation or guaranteed SLAs before paying
- —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/payments/219 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific endpoint's purpose is not described anywhere in the crawled material. Docs, pricing, and README pages all returned empty 'Connect wallet' stubs.
Warnings
- —The endpoint path /api/v1/payments/219 is not listed in the provider's public API catalog — its actual functionality is unknown.
- —All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' stub with no usable content.
- —No OpenAPI spec, input schema, or output schema is available — the response payload is entirely unknown.
- —No examples or error handling documentation found.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/payments/219
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/payments/219
- —All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com