x402basequality 0.25

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/13/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 13) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — callers simply include an X-PAYMENT header with a valid x402 payment proof.

The broader lowpaymentfee.com platform advertises a suite of APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02-per-request pricing model and x402 payment protocol on Base. However, this specific listing covers only the `/api/v1/emails/13/attachments` endpoint.

Documentation on the site 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 example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual behavior, required request body fields, and response format are unknown.

Capabilities

x402-paymentemail-attachmentsusdc-base-networkmicropaymentpost-endpointjson-response

Use cases

  • —Programmatically retrieving email attachments behind a paywall
  • —Agent-driven access to stored email data with per-request micropayments
  • —Integrating email attachment retrieval into automated workflows without API key management

Fit

Best for

  • —Agents needing on-demand email attachment access with no subscription
  • —Developers experimenting with x402 micropayment protocols
  • —Workflows requiring keyless, pay-per-use email data retrieval

Not for

  • —Bulk email processing or high-volume attachment downloads (no documented batch support)
  • —Users needing detailed API documentation or guaranteed SLAs
  • —Accessing arbitrary email IDs (this endpoint is hardcoded to email 13)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/13/attachments \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/13/attachments
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the endpoint path suggests a single hardcoded resource (email 13) with no explanation of what it returns. Effectively a stub listing.

Warnings

  • —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
  • —No OpenAPI or JSON schema for request or response bodies
  • —Endpoint path is hardcoded to email ID 13; unclear if other email IDs are accessible
  • —The purpose and content of the email attachments are completely undocumented
  • —No examples of successful responses available

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 18:52:27Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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