x402-gated email data endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides premium API access to an email-related resource (specifically `/api/v1/emails/28`) via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request.
Payment is settled on the Base network using USDC (contract `0x8335...2913`). The x402 challenge advertises a `maxAmountRequired` of 20,000 base units, which at 6 decimals equals $0.02. No API keys or rate limits are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The endpoint accepts HTTP POST requests and returns `application/json`.
The specific functionality of `/api/v1/emails/28` is not documented beyond the generic label "Premium API Access." The provider's landing page lists many endpoint categories but does not include an emails category, so the exact data returned by this particular resource is unclear. Documentation pages (`/docs`, `/pricing`, `/README`) all resolve to a minimal "Connect wallet" page with no further technical detail. Prospective callers should be aware that the endpoint's behavior is essentially undocumented.
Capabilities
Use cases
- —Retrieving email-related data on a per-request payment basis
- —Integrating a zero-signup, wallet-authenticated API into agent workflows
- —Demonstrating x402 payment protocol integration on Base
Fit
Best for
- —Agents or developers who want keyless, pay-per-call API access
- —x402 protocol experimentation and integration testing
- —Scenarios requiring no subscription commitment for occasional API calls
Not for
- —Users who need well-documented, production-grade email APIs with clear schemas
- —High-volume use cases where per-request pricing may add up without bulk discounts
- —Anyone without a Base-compatible wallet or USDC balance
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/28 \
-H "X-PAYMENT: <x402_payment_proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /emails/28 resource — no request schema, no response schema, no examples, and the docs/pricing/README pages are all blank. The endpoint's actual functionality is unknown.
Warnings
- —The specific functionality of /api/v1/emails/28 is completely undocumented; the provider's landing page does not list an emails category.
- —All documentation pages (/docs, /pricing, /README) return only a 'Connect wallet' stub with no technical content.
- —No request or response schema is available; callers cannot know what to send or what to expect back.
- —The endpoint description is a generic 'Premium API Access' label that provides no information about the resource.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/emails/28
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/emails/28
- —Documentation pages resolve to minimal 'Connect wallet' contenthttps://lowpaymentfee.com/docs