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 are priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/payments/345` is listed under the title "Premium API Access" but the crawl material does not clarify what data or functionality this particular path returns — it is not among the named endpoints on the landing page (analytics, AI, finance, or utils). 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) on Base, and returns `application/json`. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`.
Documentation is extremely thin — the /docs, /api, /pricing, 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 usage examples available from the crawl. Prospective callers should be aware that the exact input parameters and response format for this endpoint are undocumented.
Capabilities
Use cases
- —Programmatic access to a premium API resource with per-call USDC micropayments
- —Agent-driven workflows that need keyless, on-demand API access settled on Base
- —Testing x402 payment flows against a live, low-cost endpoint
Fit
Best for
- —Developers exploring x402 payment protocol integrations
- —AI agents that can settle USDC payments on Base autonomously
- —Use cases requiring no-signup, no-rate-limit API access
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/345 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and the specific purpose of /api/v1/payments/345 is not described anywhere in the crawl. Effectively a stub listing.
Warnings
- —The exact functionality of /api/v1/payments/345 is not documented — it does not appear in the provider's listed API catalog.
- —All documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no usable content.
- —No OpenAPI spec, request schema, or response schema is available.
- —Input parameters for this endpoint are completely unknown.
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is live on Base with USDChttps://lowpaymentfee.com/api/v1/payments/345
- —All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base; maxAmountRequired 20000 base units = $0.02https://lowpaymentfee.com/api/v1/payments/345
- —Provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com