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/21`) 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 listed at $0.02 per request with no API keys, no rate limits, and no commitments required. However, the specific `/api/v1/emails/21` endpoint is not listed on the homepage's catalog, and no documentation or schema details are available for it beyond the x402 challenge metadata.
The endpoint accepts POST requests and returns `application/json`. No OpenAPI spec, detailed input/output schema, or usage examples were found in the crawl. The docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no substantive content. The exact nature of the data returned by this email endpoint is unclear from available materials.
Capabilities
Use cases
- —Retrieving email-related data on a per-request payment basis without API keys
- —Agent-driven workflows that need to fetch email content or metadata with micropayments
- —Integrating pay-as-you-go email data access into automated pipelines
Fit
Best for
- —Developers wanting keyless, pay-per-request email data access
- —AI agents that can settle x402 payments in USDC on Base
- —Use cases requiring low-friction, no-commitment API access
Not for
- —Users needing detailed documentation or guaranteed SLAs before integrating
- —High-volume email processing where per-request pricing is cost-prohibitive
- —Anyone who needs to understand the exact response schema before paying
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/21 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, no examples, and the specific email endpoint is not even listed on the provider's homepage. The docs/pricing/API pages are all empty beyond a wallet connect prompt. The purpose and response format of /api/v1/emails/21 are unknown.
Warnings
- —The /api/v1/emails/21 endpoint is not listed in the provider's public API catalog on the homepage
- —No documentation, OpenAPI spec, or response schema is available for this endpoint
- —All doc/pricing/API pages returned only a 'Connect wallet' prompt with no content
- —The exact nature of the data returned (email content, metadata, etc.) is completely unclear
- —Cannot verify what data is actually served after payment
Citations
- —The endpoint returns a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/emails/21
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/emails/21
- —The docs, pricing, and API pages render only a Connect wallet prompthttps://lowpaymentfee.com/docs