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Solidity Smart Contract Heuristic Linter
x402
Solidity Smart Contract Heuristic Linter is a paid API for AI agents from api.fadeandco.workers.dev, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-29).
Runs heuristic static analysis on Solidity source code to detect common security patterns like unchecked low-level calls, reentrancy risks, arithmetic overflow, and missing access controls, returning findings with line numbers and severity.
Price / call$0.004
Success—
StatusUnknown
How this service works
Heuristic Solidity linter for a snippet or file (up to 60000 characters): unchecked low-level call/send/delegatecall, value-sending external calls before a storage write (possible reentrancy), arithmetic under pragma below 0.8.0 (overflow risk), and public or external state-changing functions without a visible owner or sender check, with line numbers. Not an audit; misses most real bugs.
Output
A JSON object containing a verdict string (e.g. HIGH_RISK_PATTERNS or CLEAN), severity counts (high, medium, total), a list of individual findings each with line number, rule name, matched source text, and severity, plus a checkedAt timestamp and a disclaimer note that this is heuristic-only and not a formal audit.
Example use cases
Pre-deploy reentrancy check
“Before I deploy this contract, can you run it through the Solidity linter and tell me if there are any reentrancy risks or unchecked external calls? Here's the source code: `pragma solidity ^0.6.0; contract Bank { mapping(address => uint) balances; function withdraw(uint amt) external { msg.sender.call{value: amt}(""); balances[msg.sender] -= amt; } }`”
Overflow risk scan for legacy contract
“I have an old Solidity 0.7.0 contract that wasn't written with SafeMath — can you lint it for arithmetic overflow risks and any other high-risk patterns? Source: `pragma solidity ^0.7.0; contract Token { uint public totalSupply; function mint(uint amount) public { totalSupply += amount; } }`”
Access control audit for public functions
“Can you check this smart contract for public or external state-changing functions that don't have any owner or sender access control? I want to know which functions are exposed without a guard. Source: `pragma solidity ^0.8.0; contract Admin { uint public value; function setValue(uint v) external { value = v; } }`”
Technical details
Endpoint
POSThttps://api.fadeandco.workers.dev/api/agent-intel/smart-contract-linter-audit?utm_source=zero.xyzWhen to prefer
Choose this endpoint for fast, inexpensive ($0.004) pre-deploy sanity checks on Solidity contracts when you need line-numbered findings for common patterns like reentrancy, unchecked calls, and missing access control. It is not a replacement for a formal audit but is useful for quick CI/CD signal, early-stage review, or screening untrusted contract code. Prefer dedicated audit tools or manual expert review for production deployments.
Side effects
- Source code shorter than 10 characters or longer than 60000 characters returns a validation error
- Non-Solidity or malformed text may produce zero findings with no error, giving false confidence
- Heuristic rules miss most real bugs and may produce false positives — findings are not exhaustive
- Cloudflare Worker timeout on very large inputs near the 60000-character limit
- Payment failure or missing x402 payment header returns a 402 or 401 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| source | string | Solidity source text, 10 to 60000 characters |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Heuristic line rules only. Not a security audit. Real bugs are often missed and some findings are false alarms.",
"counts": {
"high": 2,
"total": 2,
"medium": 0
},
"source": "hand-written rules",
"verdict": "HIGH_RISK_PATTERNS",
"findings": [
{
"line": 1,
"rule": "unchecked-low-level-call",
"text": "function pay(address to) public { to.call{value: 1 ether}(\"\"); balance[to] = 0; }",
"severity": "high"
},
{
"line": 1,
"rule": "possible-reentrancy",
"text": "state write after external call at line 1 in pay",
"severity": "high"
}
],
"checkedAt": "2026-10-23T09:35:20.037Z"
}
}Tags
x402
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