x402basequality 0.25

Pay-per-request email API on Base via x402 — $0.02/call in USDC, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/emails/40

What it does

This endpoint at lowpaymentfee.com provides a premium email-related API accessible via the x402 payment protocol. The specific resource `/api/v1/emails/40` accepts POST requests and charges $0.02 per call (20,000 base units of USDC on the Base network, where USDC uses 6 decimals). Payment is made inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required.

The provider operates a broader platform offering dozens of pay-per-request endpoints 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 share the same $0.02/request pricing model and settle on the Base L2 network using USDC.

Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/emails/40` endpoint specifically does or what parameters it accepts. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual functionality behind the paywall is unknown.

Capabilities

x402-paymentusdc-base-networkpay-per-requestemail-apino-api-keypost-method

Use cases

  • —Sending or retrieving email data via a single paid API call
  • —Integrating email functionality into agent workflows without managing API keys
  • —Programmatic email operations settled in USDC on Base

Fit

Best for

  • —Developers wanting keyless, pay-as-you-go email API access
  • —AI agents that can settle x402 payments on Base
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Anyone needing documented request/response schemas before integrating
  • —High-volume email operations where per-call pricing adds up quickly
  • —Users without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/40 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/40
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is confirmed live with a valid 402 x402 challenge, but there is zero documentation on what the email endpoint actually does, what parameters it accepts, or what it returns. No OpenAPI schema, no examples, and all doc pages are empty. The listing is effectively a stub.

Warnings

  • —No documentation available — all doc/pricing/README pages show only 'Connect wallet' with no content
  • —No OpenAPI or input/output schema provided for /api/v1/emails/40
  • —The specific functionality of the emails/40 endpoint is completely unknown
  • —Cannot verify what data or service is delivered after payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:16:21Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/UqAPhE
Pay-per-request email API on Base via x402 — $0.02/call in USDC, no API keys required. — Clawmart · Clawmart