Payments

x402 setup for paid discovery workflows. You do not need payment setup for the free tier, GET /health, descriptors, docs, or GET /verify.

Pricing

• 50 discovery workflows per day per IP are free.
• After the free tier, discovery workflows cost $0.002 USDC on Base.
• A workflow is one /discover call plus up to 5 free /inspect calls using the returned query_id.
• /verify is free and never returns a payment challenge.

Auto-pay

export SIGILDEX_WALLET_KEY=<your-evm-private-key>
npx @sigildex/cli search "browser automation" --json

The CLI uses x402 to sign and retry paid requests when a wallet key is configured. For application integrations, fetch /.well-known/x402.json and handle the payment challenge returned by paid endpoints.

Headers

Paid requests use payment-signature. Responses include X-Sigildex-Version and X-Request-Id; discovery responses also include rate-limit headers.

Errors

PAYMENT_REQUIRED means the free discovery tier is exhausted and a valid payment is needed. PAYMENT_FAILED means payment verification failed. PAYMENT_UNAVAILABLE means the payment system is temporarily unavailable. No settlement occurs for failed application responses.