Pay-per-request email API on Base via x402 — $0.02/call in USDC, no API keys required.
What it does
This endpoint at lowpaymentfee.com provides a pay-per-request email-related API accessible via the x402 payment protocol. The specific resource path `/api/v1/emails/15` suggests retrieval or interaction with a particular email record (ID 15). Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, subscriptions, or rate limits are advertised — callers simply attach an x402 payment header to each POST request.
The provider, lowpaymentfee.com, hosts a broader catalog of x402-gated endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced uniformly at $0.02 per call. Documentation beyond the landing page is extremely thin — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what request body to send or what response shape to expect.
Capabilities
Use cases
- —Fetching or interacting with email data on a per-request payment basis
- —Agent-driven email retrieval without needing pre-provisioned API keys
- —Programmatic access to email records settled via on-chain USDC micropayments
Fit
Best for
- —AI agents that need keyless, pay-as-you-go email data access
- —Developers experimenting with x402 payment-gated APIs
- —Use cases requiring low-friction, no-subscription API access on Base
Not for
- —High-volume email operations where per-request pricing becomes expensive
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/15 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts payments. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific purpose of /api/v1/emails/15 is unclear. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown
- —All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no technical content
- —The specific function of /api/v1/emails/15 is unclear — it could be email retrieval, sending, or something else
- —The provider lists many endpoint categories but none are documented beyond titles and prices
Citations
- —Endpoint returns a valid x402 402 challenge with USDC on Base networkhttps://lowpaymentfee.com/api/v1/emails/15
- —maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02https://lowpaymentfee.com/api/v1/emails/15
- —Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Documentation pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs