x402-gated email endpoint on Base, pay $0.02 per request in USDC with no API keys.
What it does
This endpoint at lowpaymentfee.com provides premium API access via the x402 payment protocol. The specific resource `/api/v1/emails/8` is part of a broader platform that offers dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind x402 micro-payments on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, no minimums, and instant access. The x402 challenge was successfully captured with version 1 of the protocol and a 300-second payment timeout.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no description of what the `/api/v1/emails/8` endpoint actually does or what input it expects. The "emails/8" path suggests it may retrieve or interact with a specific email resource (ID 8), but this is purely speculative. Without documentation or example payloads, integrators will need to experiment to determine the expected request body and response format.
Capabilities
Use cases
- —Accessing email data or functionality via a single micro-payment call
- —Integrating pay-per-use email operations into agent workflows
- —Testing x402 payment protocol integrations on Base
Fit
Best for
- —Developers experimenting with x402 micro-payment APIs
- —Agents needing keyless, pay-per-call email access
- —Low-volume, on-demand email operations without subscriptions
Not for
- —Production email workflows requiring documented schemas and SLAs
- —High-volume email sending where per-request pricing is inefficient
- —Users who need detailed API documentation before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/8 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation for this specific endpoint — no OpenAPI spec, no request/response examples, no description of what 'emails/8' does. Docs pages render only 'Connect wallet'. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No OpenAPI or schema provided for request or response
- —Purpose of /api/v1/emails/8 is unknown — 'Premium API Access' is a generic label used across all endpoints
- —The platform lists many endpoint categories but none specifically mention an 'emails' category, raising questions about this resource
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC on Basehttps://lowpaymentfee.com/api/v1/emails/8
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/emails/8