Pay-per-call email API endpoint on Base via x402, settled in USDC at $0.02/request.
What it does
This endpoint at `/api/v1/emails/43` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML, finance, infrastructure utilities, and more. Each call is settled on-chain via the x402 protocol using USDC on the Base network. The specific endpoint probed (`/api/v1/emails/43`) is listed under "Premium API Access" but does not appear on the site's public landing page among the documented API categories, making its exact functionality unclear.
The x402 challenge confirms the endpoint is live and accepts POST requests. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request — consistent with the platform's uniform $0.02/request pricing. Payment is made via the `exact` scheme to address `0x1A2B…85F3`, with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.
Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no description of what the `/api/v1/emails/43` endpoint actually returns or what input it expects. The endpoint's purpose — whether it retrieves email data, sends emails, or performs some other email-related operation — cannot be determined from available materials.
Capabilities
Use cases
- —Programmatic email data retrieval or sending via a single pay-per-call transaction
- —Agent-driven workflows that need email functionality without API key management
- —On-chain settled email operations for Web3 applications
Fit
Best for
- —Developers wanting zero-signup, pay-per-use email API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer on-chain micropayments over subscription billing
Not for
- —Production email workflows requiring documented schemas and SLAs
- —High-volume email operations where $0.02/request adds up significantly
- —Users who need clear documentation before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/43 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear at $0.02/request in USDC on Base. However, there is no documentation, no OpenAPI spec, no request/response schema, and the specific purpose of /api/v1/emails/43 is unknown. The endpoint doesn't appear in the site's public API listing, and all doc pages are empty beyond a wallet connect prompt.
Warnings
- —The endpoint /api/v1/emails/43 is not listed among the publicly documented APIs on the landing page — its purpose is unknown.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no actual content.
- —No request or response schema is available; callers cannot know what input is expected or what output is returned.
- —The 'emails/43' path suggests a resource-specific endpoint (e.g., email ID 43) but this is unconfirmed.
Citations
- —Uniform pricing of $0.02 per request across all endpointshttps://lowpaymentfee.com
- —No API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02)https://lowpaymentfee.com/api/v1/emails/43
- —Payment asset is USDC at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/emails/43