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 88) behind an x402 paywall. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals). The endpoint accepts POST requests and returns application/json responses.
The broader lowpaymentfee.com platform advertises a 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 priced at $0.02 per call. The platform emphasizes no API keys, no rate limits, and instant access via the x402 protocol.
However, the specific endpoint being listed here (`/api/v1/emails/88/attachments`) is not documented on the site's landing page among the advertised API categories. Its purpose — retrieving attachments for a specific email — is unclear in context. There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional documentation. The endpoint is live (returns a valid 402 challenge), but the lack of documentation makes it difficult to determine what data it actually returns or what input it expects.
Capabilities
Use cases
- —Retrieving email attachments programmatically via micropayment
- —Agent-driven access to email data without API keys
- —Pay-per-request email attachment download
Fit
Best for
- —Agents needing one-off email attachment retrieval without signup
- —Developers experimenting with x402 micropayment protocols
- —Automated workflows that need to fetch specific email attachments
Not for
- —Bulk email processing or mailbox management
- —Users who need documented request/response schemas before integrating
- —Production systems requiring SLA guarantees or support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/88/attachments \
-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 request/response examples, and no documentation beyond a wallet-connect prompt. The specific email attachments endpoint is not listed among the site's advertised APIs, making its purpose and expected behavior unclear. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The /api/v1/emails/88/attachments path is not listed among the site's advertised APIs — its purpose is unclear
- —All doc/pricing/API pages render only 'Connect wallet' with no usable content
- —No request body schema or response examples available — integration requires guesswork
- —Endpoint appears to target a hardcoded email ID (88), which may indicate a demo or test resource
Citations
- —The endpoint returns a 402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/emails/88/attachments
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/emails/88/attachments
- —The site lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com