x402-gated premium API endpoint on Base, pay-per-request with USDC.
What it does
This endpoint at lowpaymentfee.com is an x402 protocol-gated API resource (resource ID 149) labeled "Premium API Access." It accepts POST requests and requires an X-PAYMENT header carrying a USDC payment on the Base network. The maximum amount required per call is 20,000 units of USDC (the asset at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which is USDC on Base with 6 decimals, so this equates to $0.02 per request). The response MIME type is application/json.
The provider site lowpaymentfee.com hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, 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 with no API keys, no rate limits, and no commitments — payment is handled entirely via the x402 protocol on the Base L2 network.
However, the specific functionality behind resource 149 is not documented. The endpoint's description is simply "Premium API Access" with no further detail on what data or computation it returns. The docs, pricing, and README pages on the site all resolve to a minimal "Connect wallet" prompt with no additional technical documentation. Without an OpenAPI schema, example requests/responses, or any description of the resource's purpose, it is impossible to confirm what this endpoint actually does. Prospective callers should be aware of this ambiguity.
Capabilities
Use cases
- —Programmatic access to an unknown premium resource via x402 micropayment
- —Agent-driven API consumption without API keys using on-chain USDC payments
- —Testing x402 protocol integration with a live Base-network endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Agents that need keyless, pay-per-call API access settled in USDC
- —Exploring micropayment-gated API patterns
Not for
- —Users who need documented, well-specified API contracts before calling
- —Production workloads requiring SLA guarantees or detailed error handling docs
- —Anyone needing free or fiat-only payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/149 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no documentation, no OpenAPI schema, no example requests or responses, and the purpose of resource 149 is entirely unspecified. The site's docs/pricing/README pages are all empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —The specific functionality of resource 149 is completely undocumented — the description is only 'Premium API Access' with no further detail.
- —All documentation pages (docs, pricing, README, api) on the provider site return only a 'Connect wallet' prompt with no technical content.
- —No OpenAPI or output schema is provided; callers cannot know what request body to send or what response to expect.
- —The broad catalog on the landing page lists many endpoints but resource 149 does not clearly map to any of them.
Citations
- —The endpoint returns a 402 challenge with x402Version 1, requiring USDC payment on Base network with maxAmountRequired of 20000 (≈$0.02).https://lowpaymentfee.com/api/v1/generate/resource/149
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/generate/resource/149
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —Documentation, pricing, README, and API pages all show only a 'Connect wallet' prompt.https://lowpaymentfee.com/docs