Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com hosts a collection of x402-enabled API endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/27` is labeled "Premium API Access" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol: callers attach an X-PAYMENT header with a signed payment proof, and the server fulfills the request once payment is verified. No API keys, accounts, or rate limits are advertised.
The broader platform advertises four categories of endpoints: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All are listed at $0.02 per request on the landing page.
The specific functionality behind `/api/v1/messages/27` is unclear — the description is simply "Premium API Access" with no further documentation, schema, or example responses available. The crawled docs pages (/api, /pricing, /README) all returned only a "Connect wallet" prompt with no additional content. Treat this endpoint with caution until more documentation surfaces.
Capabilities
Use cases
- —Programmatic access to a pay-per-call API without needing an account or API key
- —Agent-driven workflows that settle per-request costs in USDC on Base
- —Testing x402 payment flows against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol integrations
- —AI agents that need frictionless, keyless API access settled on-chain
- —Low-volume consumers who prefer pay-as-you-go over subscriptions
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume production workloads where $0.02/request adds up significantly
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/27 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-proof>" \
-d '{}'Example
Request
{
"url": "https://lowpaymentfee.com/api/v1/messages/27",
"body": {},
"method": "POST",
"headers": {
"X-PAYMENT": "<signed-x402-payment-proof>",
"Content-Type": "application/json"
}
}Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no indication of what /api/v1/messages/27 actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation available — /api, /pricing, and /README pages all return only 'Connect wallet' with no content.
- —The purpose of /api/v1/messages/27 is unknown; 'Premium API Access' is the only description provided.
- —No request or response schema is documented; callers must guess at the expected input format.
- —No examples of successful responses are available anywhere in the crawled material.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/messages/27
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/messages/27
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com