Pay-per-call email API on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
This endpoint at lowpaymentfee.com provides a premium email-related API accessible via the x402 payment protocol. The specific path `/api/v1/emails/60` suggests an email data or email-processing resource (the exact functionality is not documented beyond the generic "Premium API Access" label). Payment is settled on the Base network using USDC at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, accounts, or rate limits are advertised — callers simply attach an x402 payment header to each POST request.
The provider, lowpaymentfee.com, hosts a broader catalog of x402-gated endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per call. However, the `/api/v1/emails/60` endpoint is not listed on the provider's public landing page among the advertised APIs, and no dedicated documentation, request schema, or response schema is available for it. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation means callers will need to experiment or contact the provider to understand the expected POST body and response format.
Capabilities
Use cases
- —Fetching email-related data or metadata on a per-call basis without subscription
- —Integrating email functionality into agent workflows that settle payments via x402
- —Accessing premium email resources with micropayments in USDC on Base
Fit
Best for
- —Developers wanting zero-signup, pay-per-use email API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-cost, on-demand email data without rate limits
Not for
- —Users who need detailed API documentation and guaranteed schemas before integrating
- —High-volume email sending — no evidence this is a transactional email sending service
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/60 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and the endpoint is not even listed on the provider's own landing page. The exact functionality behind '/api/v1/emails/60' is unknown, making this effectively a stub listing.
Warnings
- —Endpoint /api/v1/emails/60 is not listed among the provider's publicly advertised APIs — may be unlisted, experimental, or deprecated.
- —No request body schema or response schema is documented anywhere; callers must guess the expected input.
- —The crawled docs, pricing, API, and README pages all returned only 'Connect wallet' with no useful content.
- —Exact functionality (email lookup, email sending, email validation, etc.) is completely unspecified.
Citations
- —The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The x402 challenge specifies maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, which equals $0.02.https://lowpaymentfee.com/api/v1/emails/60
- —The endpoint is not listed among the provider's publicly advertised API catalog on the landing page.https://lowpaymentfee.com