x402-gated email endpoint on Base, pay $0.02 per request in USDC — no API keys required.
What it does
This endpoint at lowpaymentfee.com provides premium API access via the x402 payment protocol. The specific resource `/api/v1/emails/70` 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 micropayments 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, and instant access — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.
Documentation is extremely sparse: the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no description of what the `/emails/70` resource actually returns. The endpoint path suggests it retrieves or processes email-related data (possibly a specific email record by ID), but this is speculative. The x402 challenge is live and well-formed, confirming the endpoint is operational.
Capabilities
Use cases
- —Retrieving or processing email data on a per-request payment basis
- —Agent-driven email lookups without needing pre-provisioned API keys
- —Programmatic access to email resources with crypto micropayments
Fit
Best for
- —Agents or scripts that need on-demand email data without subscription commitments
- —Developers experimenting with x402 payment-gated APIs on Base
- —Low-volume, pay-as-you-go email data access
Not for
- —High-volume email processing where per-request costs add up quickly
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/70 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what /api/v1/emails/70 actually does. The docs/pricing/README pages are all blank 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 request/response schema provided; the actual function of /api/v1/emails/70 is unknown
- —The purpose of the 'emails/70' resource is entirely unclear — it could be email retrieval, validation, or something else
- —No agents.txt or robots.txt present
Citations
- —The endpoint returns a 402 challenge requiring USDC payment of 20,000 base units ($0.02) on Base networkhttps://lowpaymentfee.com/api/v1/emails/70
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/emails/70
- —Docs, pricing, API, and README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs