x402-gated email data endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides premium API access to an email-related resource (specifically `/api/v1/emails/83`) via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The cost per request is $0.02 (20,000 base units of USDC with 6 decimals), settled to a specified wallet address.
The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request with no API keys, no rate limits, and no commitments required. Payments are made via x402 using USDC on the Base network.
The specific `/api/v1/emails/83` endpoint is not listed on the site's main catalog, and its exact functionality is unclear — the description simply reads "Premium API Access." There is no OpenAPI schema, no documentation beyond the landing page, and the docs/pricing/API pages all render only a "Connect wallet" prompt with no additional content. The endpoint accepts POST requests and returns `application/json`.
Capabilities
Use cases
- —Retrieving email-related data on a per-request payment basis
- —Agent-driven workflows that need email data without API key provisioning
- —Programmatic access to premium email content gated by crypto micropayment
Fit
Best for
- —Agents or scripts that can settle x402 payments in USDC on Base
- —Use cases requiring no-signup, no-API-key access to email data
- —Low-volume, pay-as-you-go consumption of premium data
Not for
- —Users who need detailed documentation or schema before integrating
- —High-volume use cases where per-request pricing may add up
- —Anyone unable to pay with USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/83 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI schema, no documentation, no example requests or responses, and the specific /emails/83 resource is not described anywhere on the site. The endpoint's actual functionality is unknown beyond the generic 'Premium API Access' label.
Warnings
- —The /api/v1/emails/83 endpoint is not listed in the site's public API catalog — its purpose is unclear.
- —No documentation, OpenAPI spec, or response schema is available for this endpoint.
- —The docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no useful content.
- —The exact data returned by this endpoint is unknown; integrate with caution.
Citations
- —The endpoint returns a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/emails/83
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/emails/83