Pay-per-call email data endpoint on Base via x402, settled in USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides premium API access to an email-related resource (specifically `/api/v1/emails/23`) using the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.
Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge specifies a `maxAmountRequired` of 20000 base units, which at 6 decimals equals $0.02 USD per call. The endpoint accepts POST requests and returns `application/json` responses. The x402 version is 1, using the "exact" payment scheme with a 300-second timeout.
The specific functionality of the `/api/v1/emails/23` endpoint is not documented on the site — the landing page lists analytics, AI, finance, and utility endpoints but does not mention email-specific APIs. The crawled docs, pricing, and README pages all returned only a "Connect wallet" prompt with no additional documentation. As a result, the exact request format and response schema for this particular endpoint are unknown and must be discovered by the caller.
Capabilities
Use cases
- —Retrieving email-related data on a per-call payment basis
- —Integrating pay-per-use email data into agent workflows without API key management
- —Accessing premium data endpoints with crypto micropayments on Base
Fit
Best for
- —Agents or developers who want keyless, pay-per-call API access
- —Users who prefer USDC micropayments on Base over subscription billing
- —Workflows needing on-demand email data without rate limits
Not for
- —Users who need detailed API documentation or schema guarantees before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/23 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /api/v1/emails/23 endpoint — no request schema, no response schema, no examples, and the email endpoint is not even listed on the provider's landing page. All docs/pricing/README pages returned only 'Connect wallet' with no content.
Warnings
- —The /api/v1/emails/23 endpoint is not listed among the provider's advertised APIs on the landing page — its purpose is unclear.
- —No API documentation is available; docs, pricing, and README pages all render only a 'Connect wallet' prompt with no useful content.
- —Request and response schemas are completely unknown — no OpenAPI spec, no examples, no field descriptions.
- —The specific resource '/emails/23' suggests a hardcoded or demo resource ID; it may not represent a general-purpose email API.
Citations
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The x402 challenge specifies maxAmountRequired of 20000 base units in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.https://lowpaymentfee.com/api/v1/emails/23
- —The platform lists endpoints for analytics, AI, finance, and infrastructure but does not list any email-specific endpoints.https://lowpaymentfee.com
- —Docs, pricing, and README pages returned only 'Connect wallet' with no documentation content.https://lowpaymentfee.com/docs