Pay-per-use DeFi intelligence API with 11 endpoints via x402 micropayments in USDC.
What it does
Silverback is a DeFi intelligence API suite designed for the agent economy. It exposes 11 pay-per-use endpoints covering swap execution (via Permit2), swap quoting, technical analysis, DeFi yield discovery, cross-DEX arbitrage scanning, token security audits, whale transaction tracking, wallet portfolio lookups, liquidity pool analysis, Jupiter DEX quotes on Solana, and token holder analytics. All endpoints use the x402 micropayment protocol, settling in USDC on Base, Solana, or SKALE (with a 15% discount available when paying with the $BACK token via Permit2 on Base).
Pricing is tiered by endpoint complexity: execution endpoints (swap) cost $0.05 per call, heavy analysis endpoints (technical-analysis, defi-yield, arbitrage-scanner) cost $0.03, intelligence endpoints (token-audit, whale-moves, wallet-portfolio) cost $0.02, and lighter analysis endpoints (pool-analysis, swap-quote, jupiter-quote, holder-analytics) cost $0.01. Token identifiers use CoinGecko IDs for market data endpoints and 0x contract addresses for on-chain endpoints. The default chain is Base (chain ID 8453). All responses include a `success` boolean field.
Note: The specific `/api/v1/top-coins` endpoint listed here returned 404 during probing on both GET and POST, though the broader Silverback API platform at `x402.silverbackdefi.app` appears operational with a full OpenAPI spec describing 11 endpoints. The top-coins endpoint may have been removed or renamed. Agents should consult the discovery endpoint or OpenAPI spec for current available routes.
Capabilities
Use cases
- —AI agents autonomously executing token swaps on Base via Permit2
- —Automated technical analysis of crypto assets with RSI, MACD, and Bollinger Bands
- —Scanning cross-DEX arbitrage opportunities with spread analysis
- —Running security audits on token contracts to detect honeypots and ownership risks
- —Tracking whale wallet movements and large transactions in real time
Fit
Best for
- —AI agents needing pay-per-call DeFi intelligence without subscriptions
- —Developers building autonomous trading or portfolio management bots
- —On-chain analysts who want programmatic access to yield, liquidity, and holder data
Not for
- —Users needing free or subscription-based API access
- —Applications requiring non-crypto financial data
- —High-frequency trading requiring sub-second latency (hosted on Render)
Quick start
# Get a swap quote on Base (requires x402 payment header)
curl -X POST https://x402.silverbackdefi.app/api/v1/swap-quote \
-H 'Content-Type: application/json' \
-d '{"tokenIn": "WETH", "tokenOut": "USDC", "amountIn": "1.0"}'Example
Request
{
"tokenIn": "WETH",
"amountIn": "1.0",
"tokenOut": "USDC"
}Endpoint
Quality
The specific /api/v1/top-coins endpoint returned 404 on both GET and POST, indicating it may not exist or has been removed. The broader Silverback platform has a detailed OpenAPI spec with 11 documented endpoints and clear pricing, but the listed endpoint itself is not live. No example response data is available.
Warnings
- —The /api/v1/top-coins endpoint returned 404 on both POST and GET — it may have been removed or renamed.
- —The OpenAPI spec server URL is x402.silverbackdefi.app, not silverback-x402.onrender.com — the listed endpoint host may be a legacy or alternate deployment.
- —The /docs path returns 'Cannot GET /docs' — external docs at docs.silverbackdefi.app were not crawled.
- —No example response data available for any endpoint.
- —The 'top-coins' endpoint is not listed in the OpenAPI spec's 11 documented paths.
Citations
- —Silverback provides 11 pay-per-use endpoints via x402 micropayments in USDC on Base, Solana, and SKALE.https://silverback-x402.onrender.com
- —Pricing tiers: Execution $0.05, Heavy analysis $0.03, Intelligence $0.02, Analysis $0.01.https://silverback-x402.onrender.com
- —$BACK token payments receive a 15% discount via Permit2 on Base.https://silverback-x402.onrender.com
- —The /api/v1/top-coins endpoint returned 404 on both POST and GET.https://silverback-x402.onrender.com/api/v1/top-coins
- —The OpenAPI spec lists server URL as x402.silverbackdefi.app.https://silverback-x402.onrender.com