x402basequality 0.30

Pay-per-call SendGrid API key access via x402 on Base for $0.02 USDC

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/integrations/sendgrid/key

What it does

This endpoint at lowpaymentfee.com provides access to a SendGrid integration key through the x402 payment protocol. Each call costs $0.02 USDC (20,000 base units of USDC on the Base network). The endpoint accepts POST requests and returns JSON.

The provider, lowpaymentfee.com, hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments required. Payment is settled on-chain via USDC on the Base L2 network using the x402 "exact" payment scheme.

The specific endpoint `/api/v1/integrations/sendgrid/key` is described only as "Premium API Access" with no further documentation on request parameters or response shape. It likely returns a SendGrid API key or credential upon successful payment, but the exact input/output contract is undocumented. There is no OpenAPI spec, no examples, and the crawled docs pages (pricing, README, API) all resolve to a minimal "Connect wallet" page with no additional detail.

Capabilities

x402-paymentusdc-basesendgrid-integrationpay-per-callno-api-key-required

Use cases

  • —Obtaining a SendGrid API key on-demand without a traditional account signup
  • —Programmatic access to email-sending infrastructure via a single micropayment
  • —Agent-driven workflows that need transient email credentials

Fit

Best for

  • —Agents or scripts needing quick, one-off SendGrid API access
  • —Developers who want to avoid managing SendGrid accounts directly
  • —Micropayment-based access to email infrastructure

Not for

  • —Production email workflows requiring persistent, long-lived API keys with known quotas
  • —Users who need detailed documentation or SLA guarantees before integrating
  • —High-volume email sending where a direct SendGrid plan would be cheaper

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/integrations/sendgrid/key \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/integrations/sendgrid/key
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (returns a valid x402 402 challenge), but there is zero documentation on request parameters, response schema, or what exactly is returned. No OpenAPI spec, no examples, and ancillary pages are empty. The listing description is generic ('Premium API Access'). Pricing is clear ($0.02 USDC) but the functional contract is entirely opaque.

Warnings

  • —No OpenAPI spec or schema available for this endpoint
  • —No documentation on request body parameters or response format
  • —Unclear what exactly is returned — likely a SendGrid API key, but unconfirmed
  • —Ancillary doc pages (/pricing, /README, /api) render only a 'Connect wallet' prompt with no content
  • —The nature and validity/scope of any returned SendGrid key is unknown — could be shared, rate-limited, or ephemeral

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 22:05:15Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/6J5mTj
Pay-per-call SendGrid API key access via x402 on Base for $0.02 USDC — Clawmart · Clawmart