Pay-per-use DeFi intelligence API: swaps, yields, audits, and analytics via x402 micropayments.
What it does
Silverback is a DeFi intelligence API suite designed for the agent economy. It exposes 11 pay-per-use endpoints covering token swaps (Base via Permit2), swap quotes, Jupiter DEX quotes (Solana), technical analysis, DeFi yield opportunities, cross-DEX arbitrage scanning, token security audits, whale transaction tracking, wallet portfolio lookups, liquidity pool analysis, 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 or 0x contract addresses for on-chain queries. All responses return JSON with a `success` boolean field.
Note: The specific endpoint `/api/v1/top-protocols` listed here returned 404 during probing, though the broader Silverback API (served from `x402.silverbackdefi.app`) has a full OpenAPI spec describing the 11 endpoints above. The `/api/v1/top-protocols` path is not documented in the OpenAPI spec, suggesting it may have been removed or renamed. Agents should target the canonical server at `https://x402.silverbackdefi.app` and use the documented endpoint paths.
Capabilities
Use cases
- —AI agents autonomously executing token swaps on Base via Permit2
- —Automated DeFi yield scanning with risk-adjusted portfolio allocation recommendations
- —Monitoring whale wallet movements to detect large buy/sell signals
- —Running security audits on tokens before purchasing to detect honeypots and ownership risks
- —Getting cross-DEX arbitrage opportunities with spread analysis
Fit
Best for
- —AI agents needing pay-per-call DeFi data without subscriptions
- —Autonomous trading bots requiring swap routing and quote comparison
- —DeFi researchers analyzing liquidity pools, holder concentration, and yield opportunities
Not for
- —High-frequency trading requiring sub-second latency (hosted on Render)
- —Non-crypto use cases with no need for DeFi intelligence
- —Users who need free or subscription-based access without x402 wallet setup
Quick start
# Get a swap quote on Base (x402 payment required)
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 OpenAPI spec is comprehensive with 11 documented endpoints, clear pricing, and detailed schemas. However, the specific listed endpoint (/api/v1/top-protocols) returned 404 and is not present in the OpenAPI spec, indicating it may be removed or undocumented. The canonical server differs from the listed endpoint's host. No example responses are available.
Warnings
- —The endpoint /api/v1/top-protocols returned 404 on both GET and POST — it is not documented in the OpenAPI spec and may have been removed or renamed.
- —The OpenAPI spec lists the canonical server as https://x402.silverbackdefi.app, but this listing targets https://silverback-x402.onrender.com which may be a staging or legacy host.
- —The /docs path returns 'Cannot GET /docs' — external docs at docs.silverbackdefi.app were not crawled.
- —No example response bodies are available from the probe or crawl.
Citations
- —Silverback provides 11 pay-per-use endpoints via x402 micropayments with 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 via Permit2 on Base offer a 15% discount.https://silverback-x402.onrender.com
- —The /api/v1/top-protocols endpoint returned 404 on both POST and GET.https://silverback-x402.onrender.com/api/v1/top-protocols