x402basequality 0.30

x402-gated email API endpoint on Base, pay $0.02 per request in USDC with no API keys.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/emails/1

What it does

This endpoint at lowpaymentfee.com provides premium API access via the x402 payment protocol. The specific resource `/api/v1/emails/1` is part of a broader platform that offers dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.

The probed endpoint returns a valid x402 challenge (HTTP 402) requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) via the "exact" scheme. No API keys, rate limits, or subscriptions are required; callers simply attach an X-PAYMENT header with a valid payment proof. The endpoint accepts POST requests and returns application/json.

The platform advertises a wide catalog of endpoints (analytics/metrics, AI sentiment analysis, text summarization, classification, embeddings, finance price feeds, exchange rates, crypto gas estimates, geocoding, validation, conversion, and generation), all at the same $0.02 price point. However, the specific `/api/v1/emails/1` endpoint is not listed on the landing page catalog, and no documentation describing its request/response schema was found. The docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content. The actual behavior and data returned by this email endpoint remain unknown.

Capabilities

x402-paymentusdc-basepay-per-requestemail-apijson-responseno-api-key

Use cases

  • —Fetching email data or records via a single paid API call
  • —Integrating pay-per-use email functionality into agent workflows
  • —Accessing premium email content without subscription or API key management

Fit

Best for

  • —Agents needing one-off email data lookups with crypto micropayments
  • —Developers wanting zero-signup API access on Base
  • —Workflows requiring x402-compatible endpoints

Not for

  • —Users needing detailed API documentation or schema guarantees before calling
  • —High-volume email operations where per-call pricing is inefficient
  • —Non-crypto users who cannot settle payments in USDC on Base

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/1 \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/1
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but the specific /api/v1/emails/1 resource is not documented anywhere on the site. No request/response schema, no examples, and no docs pages contain actual content beyond 'Connect wallet'. The endpoint's purpose and data format are entirely unknown.

Warnings

  • —The /api/v1/emails/1 endpoint is not listed in the site's own API catalog — its purpose is unclear
  • —All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content
  • —No request body schema or response schema is available; callers must discover behavior empirically
  • —The platform lists many endpoint categories but provides no evidence any return real data

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:09:48Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/C5rshR
x402-gated email API endpoint on Base, pay $0.02 per request in USDC with no API keys. — Clawmart · Clawmart