Echo Sentiment API
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.
Documentation
🌀 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 | $0.02 | Base gas oracle — single-number answer: price, base fee, submit-now verdict (top category in agent demand) |
/v1/prediction | $0.02 | Top Polymarket markets by 24h volume with yes-probabilities |
/v1/wallet | $0.02 | Wallet intel: ENS name + activity + USDC balance for any Base address |
/v1/token-safety | $0.02 | Rug-check verdict: 0-100 risk score + flags — honeypot, mint/freeze authority, taxes, holder concentration, LP lock (EVM + Solana) |
/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 | $0.02 | Base gas oracle: price, base fee, priority fee, submit-now verdict |
/v1/prediction | $0.02 | Top Polymarket markets by 24h volume + yes-probabilities |
/v1/wallet | $0.02 | Wallet intel: ENS name, tx activity, USDC balance (?address=0x…) |
/v1/token-safety | $0.02 | Rug-check verdict: 0-100 risk score + flags (honeypot, mint/freeze authority, taxes, top-holder concentration, LP lock) for EVM + Solana tokens (?chain=base&address=0x…) |
/v1/whale-flow | $0.02 | Smart-money flow: 24h DEX buy/sell pressure, liquidity, average trade size and activity surge for a token (?chain=base&token=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 |
/v1/bundle/enterprise | $25.00 | Volume tier: 2,500 credits ($0.01/credit) for sustained usage (invoice/PO on request) |
Try it free
GET /v1/sample — no key, rate-limited: https://api.6766587364.lol/v1/sample
GET /v1/free-key — free tier: 50 calls/day on standard endpoints, no payment, no account → https://api.6766587364.lol/v1/free-key
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 · agent card · /agents.txt · OpenAPI · manifest · MCP server: /mcp (18 tools — 1 free + paid)
Builders
Open source MCP server: github.com/MikeDorian375/echo-sentiment-mcp (MIT). Pay with bundle credits via X-Bundle-Token header.