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/68` 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 HTTP POST requests and returns JSON. Payment is settled in USDC (contract `0x8335…2913` on Base) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The x402 challenge was successfully captured, confirming the endpoint is live.
Documentation is extremely sparse. The landing page lists available endpoints and pricing, but the `/docs`, `/pricing`, `/api`, and `/README` routes all render only a "Connect wallet" stub with no further technical detail. There is no OpenAPI spec, no request/response schema, and no description of what the `/emails/68` resource actually returns or what input it expects. The endpoint's purpose (email lookup, email sending, email validation, etc.) cannot be determined from the available material.
Capabilities
Use cases
- —Accessing email-related data or functionality via a single micropayment per call
- —Integrating pay-per-use email services into agent workflows without managing API keys
- —Programmatic email operations settled on Base L2 in USDC
Fit
Best for
- —Developers wanting key-free, pay-per-call email API access
- —AI agents that can settle x402 micropayments on Base
- —Users who prefer crypto-native API billing with no subscriptions
Not for
- —Anyone needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume use cases where $0.02/request adds up significantly
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/68 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what the /emails/68 resource actually does. This is effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' stub.
- —The purpose of /api/v1/emails/68 is unknown; it could be email lookup, sending, validation, or something else entirely.
- —No OpenAPI spec or request/response schema is provided.
- —No example requests or responses are available to verify functionality.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).https://lowpaymentfee.com/api/v1/emails/68
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The /docs, /pricing, /api, and /README pages render only a 'Connect wallet' stub with no technical documentation.https://lowpaymentfee.com/docs