Detect whether an arbitrage opportunity exists in a set of token exchange rates
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.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
192 msmedian answer time
$0.001listed price per call
$0.001price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://x402-solvers.onrender.com/v1/cycles/probe
| Category | Market data |
|---|---|
| Provider host | x402-solvers.onrender.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 4 from 4 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.001 | 192 ms |
Example input (from the provider)
{
"body": {
"edges": [
{
"dex": "aerodrome",
"fee": 0.0005,
"from": "USDC",
"rate": 0.00031,
"to": "WETH"
},
{
"dex": "uniswap",
"fee": 0.0005,
"from": "WETH",
"rate": 3300,
"to": "USDC"
}
]
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"edges": {
"description": "Directed exchange-rate edges describing a token swap graph. Supply the rates you observed; the server makes no RPC calls of its own.",
"items": {
"properties": {
"dex": {
"description": "Venue label; echoed back untouched.",
"type": "string"
},
"fee": {
"description": "Fractional swap fee, e.g. 0.003 for 0.30%. Defaults to 0.",
"exclusiveMaximum": 1,
"minimum": 0,
"type": "number"
},
"from": {
"description": "Source token symbol.",
"type": "string"
},
"pool": {
"description": "Pool address; echoed back untouched.",
"type": "string"
},
"rate": {
"description": "Units of `to` per 1 unit of `from`, BEFORE fees.",
"exclusiveMinimum": 0,
"type": "number"
},
"to": {
"description": "Destination token symbol.",
"type": "string"
}
},
"required": [
"from",
"to",
"rate"
],
"type": "object"
},
"minItems": 1,
"type": "array"
}
},
"required": [
"edges"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"description": "Fast arbitrage-existence signal for a token swap graph: whether a profitable negative cycle exists and roughly how big, WITHOUT revealing the cycle path (that is the report tier).",
"properties": {
"edgesEvaluated": {
"type": "number"
},
"hasArbitrage": {
"description": "True if a profitable round-trip cycle exists.",
"type": "boolean"
},
"hops": {
"description": "Swaps in the detected cycle (0 if none).",
"type": "number"
},
"nodesEvaluated": {
"type": "number"
},
"profitBucket": {
"description": "Coarse magnitude of the best cycle gross profit.",
"enum": [
"none",
"<=0.1%",
"0.1-0.5%",
"0.5-2%",
">2%"
],
"type": "string"
},
"tier": {
"const": "probe"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}