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/71` 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 the Base network using USDC via the x402 protocol — no API keys, no subscriptions, no rate limits. The specific resource at `/emails/71` is labeled "Premium API Access" and accepts POST requests.
The x402 challenge confirms the endpoint is live and requires a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no explanation of what the `/emails/71` endpoint actually returns or what input it expects. The endpoint's purpose (email-related data, email sending, or something else) cannot be determined from available material. Agents should treat this as a minimally documented endpoint until the provider publishes proper docs.
Capabilities
Use cases
- —Retrieving or interacting with email-related data via a single paid API call
- —Integrating a no-signup, pay-per-use email endpoint into an agent workflow
- —Testing x402 payment flows against a low-cost live endpoint
Fit
Best for
- —Agents needing a no-auth, pay-per-call email endpoint
- —Developers experimenting with x402 protocol payments on Base
- —Use cases where avoiding API key management is a priority
Not for
- —Production email workflows requiring documented request/response schemas
- —High-volume email sending where bulk pricing matters
- —Users who need detailed API documentation before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/71 \
-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 ($0.02 USDC on Base), but there is zero documentation on what the endpoint does, what inputs it accepts, or what it returns. No OpenAPI spec, no examples, no request/response schemas. The /docs and other pages are empty. This is effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content
- —No OpenAPI or schema definition for this endpoint; request body and response format are unknown
- —The purpose of /api/v1/emails/71 is unclear — it could be email retrieval, sending, or something else entirely
- —No examples or sample responses provided by the provider
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/emails/71
- —The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/emails/71
- —Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs