x402-gated email data endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides x402-protocol-gated API access to an email-related resource (specifically `/api/v1/emails/53`). It is part of a broader platform offering dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The maximum amount required is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. No API keys are needed, and the platform advertises no rate limits.
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 schema, no request/response examples, and no description of what the `/api/v1/emails/53` resource actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but the exact functionality behind this specific email endpoint is unclear from available materials.
Capabilities
Use cases
- —Retrieving email-related data behind a per-call paywall
- —Agent-driven data access without API key management
- —Programmatic pay-per-use email lookups
Fit
Best for
- —AI agents that can settle x402 payments on Base
- —Developers wanting keyless, pay-per-call API access
- —Low-volume consumers who prefer no subscription commitments
Not for
- —Users needing detailed API documentation or schemas before integrating
- —High-volume batch email processing where per-call pricing is inefficient
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/53 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what '/api/v1/emails/53' actually does. The crawled docs/pricing/API pages are all empty beyond a wallet connect prompt. 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 describing request parameters or response format
- —The specific purpose of /api/v1/emails/53 is unknown — 'Premium API Access' is a generic label
- —No request or response examples available anywhere in crawled content
- —The platform lists many endpoint categories but none appear to include an 'emails' category, making this endpoint's role unclear
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/emails/53
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/emails/53