Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transfers/16` is listed as "Premium API Access" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an x402 payment header to each request.
The broader platform advertises multiple API categories including 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 endpoints are priced at $0.02 per request.
However, the specific functionality behind `/api/v1/transfers/16` is not documented beyond the label "Premium API Access." The crawled docs, pricing, and README pages all returned only a "Connect wallet" prompt with no additional technical documentation, schemas, or example payloads. Without further documentation it is unclear what data or service this particular endpoint returns when a valid payment is provided.
Capabilities
Use cases
- —Programmatic access to premium API services without traditional API key signup
- —Agent-driven workflows that need instant, keyless API access paid in USDC
- —Testing x402 protocol integrations on Base network
Fit
Best for
- —Developers or agents wanting frictionless pay-per-use API access
- —Users who prefer crypto micropayments over subscription billing
- —x402 protocol integrators looking for low-cost endpoints on Base
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —Anyone without access to USDC on the Base network
- —High-volume consumers who would benefit from bulk pricing or subscriptions
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/16 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid 402 challenge, but there is essentially no documentation about what the endpoint actually does or returns. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. The label 'Premium API Access' is generic and uninformative. Without an output schema, example responses, or any description of the service, this is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.
- —The specific functionality of /api/v1/transfers/16 ('Premium API Access') is completely undocumented.
- —No OpenAPI schema, no example request/response payloads, and no output schema beyond the basic HTTP POST input declaration.
- —The broader platform lists many API categories (AI, finance, analytics, etc.) but none are documented with schemas or examples.
Citations
- —Endpoint returns 402 with x402 challenge requiring up to 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transfers/16
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transfers/16
- —Platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categorieshttps://lowpaymentfee.com