payment-ready 2026-08-04, probe currently failing
imported from the x402 Bazaar, not submitted by the operator · own this service? claim it · or ask to be removed
Checks a Base transaction hash for MEV exposure. Identifies whether it is a DEX swap and scans neighbouring transactions in the same block for sandwich, frontrunning or backrunning patterns, returning one of no_swap, swap_exposed, frontrun_risk or sandwich. Heuristic, Ed25519-signed.
Pay from $0.03 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.
ASSESSMENT
updated 3h agoEvidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.
reliability 89%
- uptime 24h
- 0%
- uptime 7d
- 0%
- uptime 30d
- 89%
- uptime 90d
- 89%
- response p95
- 1624ms
- avg response
- 1142ms
- total checks
- 1,374
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
compliance A (14/14), stale (probe failing)
14 of 14 x402 conformance checks pass. Full checklist below.
price $0.03 (p76 in Blockchain)
- price (min)
- $0.03
- category percentile (min)
- p76 in Blockchain
- endpoints / prices
- 1 / 1
- model
- flat
- stability
- 0%
risk clean
No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.
- domain age
- -
- registrar
- -
- hosting
- custom
- domain created
- ---
Identity facts, not a risk score.
traction ---
This service shares a payout address and its probe has been failing, so its on-chain volume is suppressed until it responds again. Settlements on a shared address while a member is down are not attributed to it.
CHANGES
3 events, detecting since 2026-07-24Payout, price, and schema changes detected on this service's x402 wire. A payout rotation at an unchanged price shows up here even when nothing else moves. Full feed at /changes.
changes price changed 9d ago (3 since 2026-07-24)
price changed · 9d ago
POST /service · eip155:8453 · USDC: 100000 → 30000
price changed · 12d ago
POST /service · eip155:8453 · USDC: 5000 → 100000
price changed · 19d ago
POST /service · eip155:8453 · USDC: 1000 → 5000
Amounts are on-wire atomic units in the named asset.
WHAT IT DOES
ai-derivedDetects MEV (Maximal Extractable Value) exposure in blockchain transactions, specifically identifying sandwich attacks, frontrunning, and backrunning on DEX swaps.
- category
- mev-detection
- in
- body
- auth
- api key
AI-generated summary. The measured data is never altered by it.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET | 402 CHANNEL |
|---|---|---|---|---|---|---|
| POST | /service | MEV Exposure Detector: detects sandwich attacks, frontrunning, and backrunning on DEX swaps by scanning block-adjacent transactions. Signal: no_swap/swap_exposed/frontrun_risk/sandwich. Ed25519-signed. POST 0x<txhash> or {"tx_hash":"0x..","chain":"base"}. | $0.03 | Base | USDC | header |
REQUEST / RESPONSE EXAMPLE
An unpaid request to POST /service returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i -X POST 'https://mevdetector.hergertsynthora.com/service'
// 402 response (captured by monitor) · 1 payload · click to expand
[
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x10800a5a5B9d72251566EC651E862A8b4B427dE0",
"amount": "30000",
"scheme": "exact",
"network": "eip155:8453",
"mimeType": "application/json",
"resource": "https://mevdetector.hergertsynthora.com/service",
"description": "MEV Exposure Detector: detects sandwich attacks, frontrunning, and backrunning on DEX swaps by scanning block-adjacent transactions. Signal: no_swap/swap_exposed/frontrun_risk/sandwich. Ed25519-signed. POST 0x<txhash> or {\"tx_hash\":\"0x..\",\"chain\":\"base\"}.",
"maxAmountRequired": "30000",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://mevdetector.hergertsynthora.com/service",
"mimeType": "application/json",
"description": "MEV Exposure Detector: detects sandwich attacks, frontrunning, and backrunning on DEX swaps by scanning block-adjacent transactions. Signal: no_swap/swap_exposed/frontrun_risk/sandwich. Ed25519-signed. POST 0x<txhash> or {\"tx_hash\":\"0x..\",\"chain\":\"base\"}."
},
"x402Version": 2
}
] OVER TIME
All charts use the 30d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/synthora-mev-exposure-detector/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.
checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression
Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.
COMPLIANCE
14/14 checks pass · grade A · stale (probe failing)last 402 captured 2026-08-04 · last up 2026-08-04
- 402 payload captured
- accepts[] array present
- payTo address recoverable
- payTo at accepts[0].payTo (conformant shape)
- payTo is a valid on-chain address
- atomic price declared
- atomic price in a sane range
- asset (token) address declared
- network resolves to CAIP-2
- payment scheme declared
- served over HTTPS
- declares the current x402 version (2)
- EIP-712 domain parameters present on every EVM entry
- x402 v2 envelope delivered in the payment-required header
SITE PILLARS
- homepage reachable
- openapi doc
- pricing page
- llms.txt
- robots.txt
- terms page
recent checks (18) live · click to expand
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