Cross-DEX arbitrage scanner on Base — find spread opportunities via x402 micropayments at $0.03/call.
What it does
The Silverback Arbitrage Scanner is a pay-per-use x402 endpoint that scans for arbitrage opportunities across decentralized exchanges (DEXes) on Base (chain ID 8453). Given an input token and output token pair, it queries multiple DEX venues and returns spread analysis showing price discrepancies that could be exploited for profit.
The endpoint accepts POST requests with a JSON body specifying `tokenIn` and `tokenOut` (as symbols like WETH/USDC or 0x contract addresses) and an optional `amount` parameter (defaults to "1"). It returns arbitrage opportunities with quotes and spread data. Payment is $0.03 per call in USDC, settled via the x402 micropayment protocol on Base, Solana, or SKALE. A 15% discount is available when paying with the $BACK token via Permit2 on Base.
This endpoint is part of the broader Silverback x402 API suite, which offers 11 DeFi intelligence and execution endpoints covering swap routing, technical analysis, yield optimization, whale tracking, token audits, and more. All endpoints follow the x402 flow: an initial request returns a 402 Payment Required challenge, the caller signs a USDC authorization, and resends with payment proof to receive the JSON response. The arbitrage scanner is categorized in the "heavy analysis" pricing tier alongside technical-analysis and defi-yield endpoints.
Capabilities
Use cases
- —Scanning for price discrepancies between DEXes on Base before executing trades
- —Automated trading agents checking for profitable arbitrage routes in real time
- —Monitoring token pair spreads across multiple Base DEX venues
- —Building arbitrage dashboards that aggregate cross-DEX pricing data
- —Backtesting arbitrage strategies by querying historical spread patterns
Fit
Best for
- —DeFi trading agents that need real-time cross-DEX spread data on Base
- —Developers building automated arbitrage bots with pay-per-use pricing
- —AI agents that need on-demand arbitrage intelligence without API key management
Not for
- —Arbitrage across non-Base chains (endpoint is Base-focused, chain 8453)
- —High-frequency trading requiring sub-second latency without per-call payment overhead
- —Users who need trade execution — this endpoint only returns quotes and spreads, not transactions
Quick start
curl -X POST https://x402.silverbackdefi.app/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
Full OpenAPI schema with clear endpoint description, request parameters, and pricing. The endpoint is live (402 challenge captured). However, no example response body is documented, the external docs link returns a 404, and the 402 challenge object was empty, so payment details (asset address, network, exact base-unit amount) could not be independently verified from the probe.
Warnings
- —External docs at https://x402.silverbackdefi.app/docs returns 'Cannot GET /docs' — documentation link is broken.
- —The x402 challenge object captured in the probe was empty (no accepts array), so payment parameters could not be independently verified beyond the OpenAPI metadata.
- —No example response schema is provided — response structure must be inferred from the summary ('arbitrage opportunities with quotes and spreads').
Citations
- —The arbitrage scanner scans for arbitrage opportunities across DEXes on Base with spread analysis, priced at $0.03 per call.https://x402.silverbackdefi.app
- —Silverback provides 11 pay-per-use intelligence and execution endpoints via x402 micropayments, with USDC on Base, Solana, and SKALE.https://x402.silverbackdefi.app
- —The arbitrage-scanner endpoint accepts tokenIn, tokenOut, and optional amount parameters via POST.https://x402.silverbackdefi.app
- —$BACK token payments via Permit2 on Base receive a 15% discount.https://x402.silverbackdefi.app
- —The endpoint returned HTTP 402 confirming it is live via x402 protocol.https://x402.silverbackdefi.app/api/v1/arbitrage-scanner