Pay-per-call email data endpoint on Base via x402, settled in USDC at $0.02/request.
What it does
This endpoint at `/api/v1/emails/92` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance, infrastructure, and more. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific resource at `/api/v1/emails/92` is listed under "Premium API Access" but its exact functionality is not well-documented — the path suggests it returns data related to a specific email record (ID 92), though the crawled documentation is extremely sparse and provides no schema or field-level details.
The endpoint is live and returns a valid x402 challenge. The price is 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints. Payment is made via the x402 `exact` scheme to the specified wallet address on Base. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised; access is gated purely by micropayment.
Documentation beyond the landing page is effectively empty (all subpages just show "Connect wallet"), so the request/response schema, required POST body fields, and the precise nature of the returned email data are unknown. This limits the endpoint's usefulness for agents that need to understand input/output contracts before calling.
Capabilities
Use cases
- —Retrieving email-related data records by ID via micropayment
- —Agent-driven data access without API key provisioning
- —Programmatic pay-per-use data retrieval on Base network
Fit
Best for
- —Agents needing keyless, pay-per-call data access
- —Developers experimenting with x402 micropayment protocols
- —Scenarios where low-friction, no-subscription API access is preferred
Not for
- —Production use cases requiring documented request/response schemas
- —Bulk email operations or sending emails
- —Use cases needing guaranteed SLAs or support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/92 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but documentation is nearly nonexistent — all doc/pricing/API pages render only 'Connect wallet'. No request or response schema is available, and the purpose of the /emails/92 resource is unclear. This is effectively a stub listing.
Warnings
- —No documentation available — all doc pages return only 'Connect wallet'
- —Request body schema is unknown; no examples or field descriptions provided
- —Response schema is unknown; the exact data returned by this endpoint is undocumented
- —The specific purpose of /api/v1/emails/92 is unclear from available materials
- —The site lists many diverse API categories but provides no evidence of actual implementation behind them
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/emails/92
- —Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limitshttps://lowpaymentfee.com
- —USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/emails/92