x402basequality 0.30

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/12/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 12) 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, with a maximum cost of $0.02 per request (20,000 base units of USDC with 6 decimals).

The provider lowpaymentfee.com hosts a broader 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 minimum commitments. However, this specific listing covers only the `/api/v1/emails/12/attachments` endpoint.

Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The endpoint is confirmed live (returns a valid 402 challenge), but the actual functionality, expected request body format, and response structure are unknown beyond the generic "Premium API Access" description.

Capabilities

x402-paymentusdc-baseemail-attachmentspay-per-requestno-api-key

Use cases

  • —Retrieving attachments from a specific email via programmatic API call
  • —Agent-driven email attachment access with per-request USDC micropayment
  • —Automated document retrieval from email storage

Fit

Best for

  • —Agents needing on-demand email attachment retrieval without API key management
  • —Developers experimenting with x402 micropayment-gated APIs
  • —Low-volume, pay-as-you-go email data access

Not for

  • —Bulk email processing or high-volume attachment downloads (no documented batch support)
  • —Users who need detailed API documentation or guaranteed SLAs
  • —Accessing arbitrary emails — this endpoint is scoped to email ID 12 only

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/12/attachments \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/12/attachments
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it exists and accepts payment. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The endpoint path suggests a very narrow scope (single email ID). Effectively a stub listing.

Warnings

  • —No API documentation available — docs, pricing, README pages all return only 'Connect wallet' with no content
  • —No request or response schema documented; request body format is unknown
  • —Endpoint is scoped to a single email ID (12) with no explanation of what this email contains
  • —Provider hosts many endpoints but none have documented schemas or usage examples
  • —Cannot verify what data is actually returned upon successful payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:02:41Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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