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/44` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific resource at `/api/v1/emails/44` is listed under "Premium API Access" but its exact functionality is not well-documented — the path suggests an email-related resource (possibly email lookup, validation, or retrieval for record ID 44), though the site's landing page does not explicitly list email endpoints among its categories.
Pricing is $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02). Payment is handled via the x402 `exact` scheme: callers attach an `X-PAYMENT` header with a signed payment to the specified `payTo` address. There are no API keys, no rate limits, and no subscription commitments — each call is independently settled on-chain. The endpoint accepts POST requests and returns `application/json`.
Documentation is extremely sparse. The `/docs`, `/pricing`, `/api`, and `/README` pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is difficult to know what request body to send or what response to expect.
Capabilities
Use cases
- —Retrieving or validating email data on a per-request payment basis
- —Agent-driven email lookups without requiring API key registration
- —Programmatic access to email resources with on-chain USDC settlement
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go email API access
- —AI agents that can settle x402 payments autonomously on Base
- —Use cases requiring no rate limits or subscription commitments
Not for
- —Users needing well-documented APIs with clear request/response schemas
- —High-volume email operations where per-request on-chain settlement adds overhead
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/44 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The exact purpose of '/api/v1/emails/44' is unclear — it is not listed on the site's landing page among the advertised API categories. This is effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content
- —The endpoint path '/api/v1/emails/44' is not listed among the site's advertised API categories, making its purpose unclear
- —No request body schema or response schema is available; callers cannot determine what to send
- —No OpenAPI specification or ai-plugin manifest found
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC on Base networkhttps://lowpaymentfee.com/api/v1/emails/44
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/emails/44
- —Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs