Echo Sentiment API

Pay-per-call sentiment analysis and market intelligence, built on x402. Dual-chain: Base + Solana. USDC. No API keys, no subscriptions — the payment is the authentication.

Try it live

• Free tier: GET https://abstain-eliminate-unison.ngrok-free.dev/v1/sample
• Paid endpoints return HTTP 402 with an x402 payment-required header
• OpenAPI: /openapi.json

Agent resources

• llms.txt
• robots.txt
• sitemap.xml
• README

Repos

• echo-sentiment-mcp — MCP server
• x402-paywall-starter — seller-side starter template