x402basequality 0.35

Retrieve email attachments via x402 micropayment on Base for $0.02 per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/emails/15/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 15) 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 $0.02 per call (20,000 base units of USDC with 6 decimals).

lowpaymentfee.com is a broader platform offering a variety of pay-per-request APIs spanning data & analytics, AI/ML (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 at $0.02 per request with no API keys, no rate limits, and no minimum commitments. Payments are made via the x402 protocol on the Base L2 network.

The specific endpoint `/api/v1/emails/15/attachments` appears to serve attachment data for a particular email resource. There is no public documentation describing the request body schema, expected parameters, or response format beyond the MIME type `application/json`. The probe confirms the endpoint is live (HTTP 402 challenge returned correctly), but the lack of detailed docs or OpenAPI spec limits confidence in how to construct useful requests.

Capabilities

x402-paymentusdc-baseemail-attachmentspay-per-requestno-api-keyjson-response

Use cases

  • —Retrieving attachments from a specific email resource without needing API keys
  • —Programmatic access to email attachment data with per-request USDC micropayments
  • —Agent-driven workflows that need to fetch email attachments on demand

Fit

Best for

  • —Agents or bots that need keyless, pay-per-use access to email attachments
  • —Developers experimenting with x402 micropayment protocols
  • —Workflows requiring on-demand email attachment retrieval without subscription overhead

Not for

  • —Bulk email processing or high-volume attachment downloads (no documented batch support)
  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —Accessing arbitrary emails — this endpoint is scoped to email ID 15 only

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/15/attachments \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/15/attachments
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI spec, no documentation of request/response schemas, and the endpoint path suggests a single hardcoded email resource (ID 15) with unclear utility. The crawled docs/pricing/README pages all returned only 'Connect wallet' with no substantive content.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —Endpoint is scoped to a single email ID (15) — unclear if other email IDs are accessible
  • —No request body schema or response examples documented anywhere
  • —All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no useful content
  • —The broader platform lists many API categories but none appear to include an emails endpoint, raising questions about this resource's purpose

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 18:52:54Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/ZFFL7C
Retrieve email attachments via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart