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Strale Tool Call Validator
x402
Strale Tool Call Validator is a paid API for AI agents from api.strale.io, paid per call via x402, $0.054/call, status unknown (last checked 2026-09-15).
Validates AI agent tool call inputs against an expected schema, returning a cryptographically audited pass/fail result
Price / call$0.054
Success—
StatusUnknown
How this service works
The trust layer for AI agents — 250+ independently tested data capabilities across 27 countries. Execute capabilities via REST, MCP, A2A, or x402 micropayments. Every call returns an audit record with cryptographic chain hashing.
Output
Returns a pass/fail validation result indicating whether the tool_input conforms to the expected_schema, along with a cryptographic audit record including a chain hash for tamper-evident logging of the validation event.
Example use cases
Pre-execution agent tool guard
“Before my AI agent fires this tool call, validate the input '{"invoice_id": "INV-2045", "amount": 299.99}' against the schema '{"type":"object","properties":{"invoice_id":{"type":"string"},"amount":{"type":"number"}}}' and tell me if it passes, plus give me the audit hash.”
Compliance audit trail for agent actions
“I need a cryptographic audit record for every tool call my agent makes — can you validate this tool input '{"user_id": "u_8812", "action": "delete_record"}' against its expected schema and return the chain hash so I can log it for compliance?”
Schema conformance check for LLM outputs
“My LLM just generated this function call payload: '{"query": "top 10 customers", "limit": 10}' — check it against the expected schema '{"type":"object","properties":{"query":{"type":"string"},"limit":{"type":"integer"}}}' and tell me if it's valid before I send it downstream.”
Technical details
Endpoint
GEThttps://api.strale.io/x402/v2/tool-call-validateWhen to prefer
Choose this endpoint when you need to validate AI agent tool call inputs against a defined schema with a cryptographically auditable record. It is especially valuable in agentic pipelines where compliance, auditability, and trust verification are required — for example, before executing high-stakes or irreversible tool calls. Prefer it over generic JSON schema validators when you need the cryptographic chain hash audit trail that Strale provides, or when operating within a multi-agent system that requires tamper-evident logging of every capability invocation.
Side effects
- Malformed JSON in tool_input causes parse error and validation failure
- Invalid or unparseable expected_schema returns schema-error response
- Missing required parameters (tool_input or expected_schema) returns 400 bad request
- Network timeout on slow connections returns 5xx error
- Input payload exceeds size limits returns payload-too-large error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tool_input | string | |
| expected_schema | string |
Tags
x402
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