Retrieve email attachments via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 74) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02), with no API keys, rate limits, or subscriptions required.
The provider lowpaymentfee.com hosts a broader suite of x402-gated APIs spanning data & analytics, AI/ML inference (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 uniformly at $0.02 per request and settle on the Base network using USDC.
Documentation is extremely sparse — the docs, API, pricing, 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 usage examples available. The specific purpose and data format of the email attachments endpoint is unclear from the available material.
Capabilities
Use cases
- —Retrieving email attachments programmatically via micropayment
- —Integrating pay-per-call email data access into agent workflows
- —Accessing email content without API key registration
Fit
Best for
- —Agents needing on-demand email attachment retrieval without subscription
- —Developers experimenting with x402 micropayment protocols
- —Low-volume, pay-as-you-go email data access
Not for
- —High-volume email processing where per-request costs add up
- —Users needing detailed API documentation or guaranteed SLAs
- —Production systems requiring well-documented request/response schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/74/attachments \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (returns 402 with a valid x402 challenge), but documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples. The endpoint path suggests email attachments for a hardcoded email ID (74), which is unusual and unexplained. The broader site lists many endpoints but provides no technical docs beyond wallet-connect prompts.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —Endpoint path references a specific email ID (74); unclear if this is a demo or production resource
- —Purpose and data returned by this specific endpoint are not documented
- —The site lists many diverse API categories but none have visible documentation, raising questions about completeness
Citations
- —Endpoint returns 402 with x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/emails/74/attachments
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/emails/74/attachments
- —Docs, API, pricing, and README pages render only 'Connect wallet'https://lowpaymentfee.com/docs