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x402-solvers Arbitrage Cycle Probe
x402
x402-solvers Arbitrage Cycle Probe is a paid API for AI agents from x402-solvers.onrender.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-20).
Scans a directed token swap-rate graph for negative-weight cycles (arbitrage opportunities), returning a boolean signal and magnitude estimate without revealing the path.
Price / call$0.001
Success—
StatusUnknown
How this service works
Detect whether an arbitrage opportunity exists in a set of token exchange rates (multi-pool negative-cycle scan). Cheap boolean + magnitude signal for trading agents. POST a swap-rate graph, get back whether a profitable cycle exists and how large — without the path.
Output
Returns a boolean indicating whether a profitable arbitrage cycle exists in the submitted swap-rate graph, along with a magnitude signal quantifying the size of the opportunity — without revealing the specific cycle path.
Example use cases
Pre-trade arbitrage sanity check
“Before I run my full path-finding solver, quickly check these 12 swap-rate edges across three Uniswap and Curve pools — ETH/USDC, USDC/DAI, DAI/WBTC, WBTC/ETH at the rates I've collected — and tell me whether any profitable cycle exists and roughly what magnitude.”
High-frequency rate monitoring filter
“I'm polling DEX rates every 5 seconds; here's the latest snapshot of edges for WETH, USDC, USDT, and DAI across four pools with their fees — probe it for a negative cycle so I know whether to bother running the expensive full solver this tick.”
Multi-pool strategy feasibility check
“I'm building a trading bot and want to know if the spread between these Balancer and Uniswap V3 pools for stablecoin pairs creates any arbitrage loop — can you scan these rate edges with their 0.01% and 0.05% fees and give me the boolean plus magnitude?”
Technical details
Endpoint
POSThttps://x402-solvers.onrender.com/v1/cycles/probe?utm_source=zero.xyzWhen to prefer
Choose this endpoint as a cheap, fast pre-filter before running expensive full arbitrage path-finding algorithms. It is ideal for high-frequency trading agents that need a boolean signal and rough magnitude to decide whether to invoke a heavier solver. Prefer it over full cycle-enumeration endpoints when you don't need the actual path — only the existence and scale of the opportunity. Best suited for agents that supply their own observed rates (the server makes no RPC calls).
Side effects
- Missing required fields (from, to, rate) on any edge returns a validation error
- Rate value of 0 or negative is rejected (exclusiveMinimum: 0)
- Fee value ≥ 1 is rejected (exclusiveMaximum: 1)
- Empty edges array (minItems: 1 violated) returns 400
- Payment not included or insufficient USDC results in 402 Payment Required
- Malformed JSON body returns parsing error
- Timeout if graph is extremely large
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| edges | array | Directed exchange-rate edges describing a token swap graph. Supply the rates you observed; the server makes no RPC calls of its own. |
Tags
x402
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