Echo Sentiment API
ชำระเงินต่อการเรียกใช้ใน USDC ผ่าน x402 — HTTP 402 → ลงนาม EIP-3009 permit (หรือการโอน Solana) → 200 ไม่ต้องมีบัญชี ไม่ต้องมี API key ไม่ต้องสมัครสมาชิก
เอกสาร
🌀 Echo Sentiment API
Real-time XLM (Stellar) market intelligence for AI agents. Composite sentiment from the Crypto Fear & Greed Index, SDEX order-flow imbalance, and 24h price momentum — rules only, no LLM in the loop.
Live on 8453 Base + Solana x402 v2 2 rails · parity pricing
Pay per call in USDC via x402 — HTTP 402 → sign an EIP-3009 permit (or Solana transfer) → 200. No account, no API key, no subscription. The payment is the authentication.
⭐ Top agent picks
Built from real agent-purchase data — the categories agents actually pay for (gas, prediction markets, wallet intel, verifiable data).
| Endpoint | Price | Why agents buy it |
|---|---|---|
/v1/gas | $0.10 | Base gas oracle — single-number answer: price, base fee, submit-now verdict (top category in agent demand) |
/v1/prediction | $0.10 | Top Polymarket markets by 24h volume with yes-probabilities |
/v1/wallet | $0.10 | Wallet intel: ENS name + activity + USDC balance for any Base address |
/v1/attested-quote | $0.10 | Oracle-grade signed price — Ed25519 verifiable, for agents that need provable data |
/v1/sentiment | $0.10 | Flagship XLM sentiment (−1..1) + components + live price — the original |
Paid endpoints
| Endpoint | Price | What you get |
|---|---|---|
/v1/sentiment | $0.10 | Composite XLM sentiment (−1..1), components, live price, spread |
/v1/gas | $0.10 | Base gas oracle: price, base fee, priority fee, submit-now verdict |
/v1/prediction | $0.10 | Top Polymarket markets by 24h volume + yes-probabilities |
/v1/wallet | $0.10 | Wallet intel: ENS name, tx activity, USDC balance (?address=0x…) |
/v1/quote | $0.10 | XLM price, best bid/ask, spread, book depth |
/v1/arb-opportunities | $0.10 | CEX↔SDEX arbitrage scan (Kraken, Upbit), net % after fees |
/v1/multi-asset | $0.10 | Strategy screen across 8 assets (SMA/RSI/Bollinger vs Buy&Hold) |
/v1/fng | $0.01 | Crypto Fear & Greed index + label (cheap decision tick) |
/v1/xlm-network | $0.10 | Stellar on-chain pulse — ledger, supply, SDEX trade stats |
/v1/attested-quote | $0.10 | Oracle-grade price + Ed25519 signature (verifiable) |
/v1/breadth | $0.10 | Market regime — top-50 breadth %, BTC dominance, risk-on/off verdict, XLM vs BTC/ETH |
/v1/sentiment-report | $0.25 | Premium: verdict, confidence, raw components, arb context |
/v1/bundle | $1.00 | 10 prepaid credits — bulk discount, one payment |
/v1/sentiment-history | $0.25 | 24h hourly sentiment series + trend direction |
Try it free
GET /v1/sample — free, rate-limited: https://api.6766587364.lol/v1/sample
Payment flow
- Agent requests any paid endpoint → server replies HTTP 402 +
payment-requiredheader (amount, asset, network, payTo). - Agent signs the payment (EIP-3009 permit on Base, or SPL transfer on Solana) via its x402 facilitator.
- Agent retries with
payment-signature→ server verifies on-chain → 200 + data.
For agents
/llms.txt · OpenAPI · manifest · MCP server: /mcp (tool get_xlm_sentiment)
Builders
Open source MCP server: github.com/MikeDorian375/echo-sentiment-mcp (MIT). Pay with bundle credits via X-Bundle-Token header.