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/77/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 77) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02), with no API keys, rate limits, or commitments required.

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/Web3 data (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 x402 payment protocol on Base. However, this specific listing covers only the `/api/v1/emails/77/attachments` endpoint.

Documentation 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 schema, no request/response examples, and no description of what the email attachments endpoint actually returns or what input parameters it expects. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to use without experimentation.

Capabilities

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

Use cases

  • —Retrieving email attachments programmatically via micropayment
  • —Integrating email data access into agent workflows without API key management
  • —Paying per-request for on-demand email attachment retrieval

Fit

Best for

  • —Agents needing one-off email attachment retrieval without subscription
  • —Developers experimenting with x402 payment protocol
  • —Low-volume, pay-as-you-go email data access

Not for

  • —High-volume email processing requiring bulk pricing or rate guarantees
  • —Users needing detailed API documentation or schema validation before integration
  • —General-purpose email sending or inbox management

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/77/attachments \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/77/attachments
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of this specific email attachments endpoint is opaque. Effectively a stub listing.

Warnings

  • —No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
  • —No OpenAPI or request/response schema provided
  • —The endpoint path references a specific email ID (77); unclear if this is parameterized or fixed
  • —Purpose and content of the email attachments endpoint is undocumented and unclear

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:18:46Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/S37vqL
Retrieve email attachments via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart