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 69) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled in USDC on the Base network using the x402 "exact" scheme, costing 20,000 base units of USDC (6 decimals), which equals $0.02 per request.
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/crypto data feeds, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments required. However, this specific listing covers only the `/api/v1/emails/69/attachments` endpoint, whose purpose is to retrieve attachments for a particular email resource.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The endpoint is confirmed live (returns a valid x402 402 challenge), but the actual behavior, required POST body fields, and response format are unknown.
Capabilities
Use cases
- —Retrieving attachments from a specific email resource via programmatic API call
- —Agent-driven email attachment fetching with automatic USDC micropayment
- —Integrating email attachment access into automated workflows without API key management
Fit
Best for
- —Agents or scripts that need to fetch email attachments and can pay per-call in USDC on Base
- —Developers wanting keyless, pay-as-you-go access to email data
- —Workflows requiring low-friction access to email attachments without subscription overhead
Not for
- —Bulk email processing requiring thousands of attachment fetches (costs add up at $0.02 each)
- —Users who need comprehensive email management (send, search, organize) — this is a single-resource endpoint
- —Anyone without a Base-compatible USDC wallet for x402 payments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/69/attachments \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of this specific email attachment endpoint is unclear beyond the URL path. The listing is effectively a stub.
Warnings
- —No documentation available — all doc/API/pricing/README pages return only 'Connect wallet' with no content.
- —No request body schema or response schema documented; actual POST payload requirements are unknown.
- —The endpoint targets a hardcoded email ID (69); unclear if this is a demo resource or a real data endpoint.
- —No OpenAPI or AI plugin manifest found.
- —The broader platform advertises many API categories but none appear to include an email/attachments endpoint, raising questions about this resource's purpose.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20,000 base units in USDC on Base network.https://lowpaymentfee.com/api/v1/emails/69/attachments
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network.https://lowpaymentfee.com/api/v1/emails/69/attachments