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 97) 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 pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto data (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced uniformly at $0.02 per request with no API keys, no rate limits, and no commitments — payment is handled entirely via the x402 protocol using USDC on Base.
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 of the /api/v1/emails/97/attachments endpoint is unclear — it is not listed among the advertised APIs on the homepage, and its function (retrieving attachments for a specific email) seems like it may be a demo or placeholder resource rather than a general-purpose API.
Capabilities
Use cases
- —Retrieving email attachments programmatically via micropayment
- —Agent-driven document retrieval from email storage
- —Demonstrating x402 payment protocol integration
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing pay-per-call access without API key management
- —Retrieving specific email attachment data on demand
Not for
- —Bulk email processing or mailbox management
- —Users needing well-documented, production-grade email APIs
- —Anyone requiring free or subscription-based access
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/97/attachments \
-H "X-PAYMENT: <x402_payment_token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response examples, and the specific endpoint (/emails/97/attachments) is not listed on the homepage. The docs pages are empty. The endpoint's actual utility is unclear.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or schema specification provided
- —This specific endpoint (/api/v1/emails/97/attachments) is not listed among the advertised APIs on the homepage — may be a demo or placeholder
- —Request body schema and response format are completely unknown
- —The endpoint references a hardcoded email ID (97), suggesting it may not be a general-purpose API
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC on Basehttps://lowpaymentfee.com/api/v1/emails/97/attachments
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs