Cross-DEX arbitrage scanner on Base — pay $0.03 per scan via x402 USDC micropayments.
What it does
The Silverback Arbitrage Scanner is a pay-per-use x402 endpoint that scans for arbitrage opportunities across decentralized exchanges on Base (chain ID 8453). Given an input token and output token (by symbol or contract address), it queries multiple DEXes and returns spread analysis showing where price discrepancies exist.
This endpoint is part of the Silverback x402 DeFi Intelligence API, which offers 11 paid endpoints covering swap execution, technical analysis, yield intelligence, token audits, whale tracking, and more. Payment is handled via the x402 micropayment protocol using USDC on Base, Solana, or SKALE. Each call to the arbitrage scanner costs $0.03. You can optionally specify an amount to check (defaults to "1"). The endpoint accepts POST requests with a JSON body containing `tokenIn` and `tokenOut` (required) and `amount` (optional).
The API is live and returns a 402 Payment Required challenge when called without payment. The OpenAPI 3.1.0 spec is published and covers all 11 endpoints. Token identifiers can be symbols (e.g., WETH, USDC) or 0x contract addresses. All responses include a `success` boolean field. The $BACK token can also be used for payment via Permit2 on Base at a 15% discount.
Capabilities
Use cases
- —Scanning for price discrepancies between DEXes on Base before executing trades
- —Automated arbitrage bots checking spreads across multiple decentralized exchanges
- —Monitoring token pair spreads to identify profitable trading opportunities
- —Agent-driven DeFi strategies that need real-time arbitrage intelligence
Fit
Best for
- —AI agents executing DeFi arbitrage strategies on Base
- —Developers building automated trading bots that need cross-DEX spread data
- —Pay-per-use arbitrage scanning without API key subscriptions
Not for
- —Arbitrage scanning on chains other than Base (only chain 8453 supported)
- —Direct trade execution (this returns analysis only; use the swap endpoint separately)
- —High-frequency trading requiring sub-second latency (hosted on Render)
Quick start
curl -X POST https://silverback-x402.onrender.com/api/v1/arbitrage-scanner \
-H "Content-Type: application/json" \
-d '{"tokenIn": "WETH", "tokenOut": "USDC", "amount": "1"}'Example
Request
{
"amount": "1",
"tokenIn": "WETH",
"tokenOut": "USDC"
}Endpoint
Quality
The OpenAPI 3.1.0 spec is complete with request schemas, pricing metadata, and clear guidance. The endpoint is live (402 challenge captured). However, no example response body is documented, the /docs path returns 404, and the 402 challenge object was empty (no payment details captured), so the exact payment flow details are inferred from the spec's guidance section rather than directly observed.
Warnings
- —The /docs URL returns 'Cannot GET /docs' — external documentation link (docs.silverbackdefi.app) was not crawled and may or may not be available.
- —The captured x402 challenge object was empty — payment parameters (token address, amount in base units, network) were not directly observed in the probe.
- —No example response schema or sample response is provided in the OpenAPI spec for this endpoint.
- —Hosted on Render free/starter tier — cold starts and latency spikes are possible.
Citations
- —The arbitrage scanner costs $0.03 per call and is categorized as 'heavy analysis' pricing tier.https://silverback-x402.onrender.com
- —Endpoint scans for arbitrage opportunities across DEXes on Base with spread analysis.https://silverback-x402.onrender.com
- —Payment supported via USDC on Base, Solana, or SKALE; $BACK token gives 15% discount via Permit2 on Base.https://silverback-x402.onrender.com
- —11 paid endpoints available; x402 v2 protocol used.https://silverback-x402.onrender.com
- —The endpoint is live and returns HTTP 402 on unauthenticated POST requests.https://silverback-x402.onrender.com/api/v1/arbitrage-scanner