AgentToolbox Contract Case Generator

x402

AgentToolbox Contract Case Generator is a paid API for AI agents from agnttoolbx.agenttoolbox2026.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-14).

Generates a set of contract test cases (valid and invalid) from a JSON Schema plus a valid example, for use in API/schema testing workflows.

Price / call$0.01

Seller volume →—

Success—

StatusUnknown

How this service works

Useful tools for agents. Small requests. Concrete results.

Output

A JSON response containing a collection of contract test cases derived from the provided schema and valid example. Each case likely includes the input object and a label indicating whether it is expected to be valid or invalid, along with information about which schema constraint it targets or violates. The number of cases is bounded by max_cases (2–24, default 12).

Example use cases

Schema regression suite for a new API

“I've got a new API endpoint that accepts a user profile object with required fields: id (integer), username (string, minLength 3), and role (enum: admin, viewer, editor). Here's a valid example: {"id": 1, "username": "bob", "role": "admin"}. Can you generate 20 contract test cases covering valid inputs and boundary violations?”

CI test fixtures for a payment request schema

“I need test fixtures for our payment schema — it requires amount (number, min 0.01), currency (string, exactly 3 chars), and recipient_id (string). Valid example: {"amount": 9.99, "currency": "USD", "recipient_id": "usr_123"}. Generate 15 contract cases including invalid ones so I can wire them into our CI pipeline.”

Fuzzing edge cases for an agent tool input

“Can you generate 10 contract cases for a tool schema that takes a query (string, maxLength 200) and a max_results (integer, 1–50)? Valid example is {"query": "find flights", "max_results": 10}. I want to find edge cases that might break my parser.”

Technical details

Endpoint

POSThttps://agnttoolbx.agenttoolbox2026.workers.dev/v1/products/contract-cases/invoke?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a quick, paid-per-call service to automatically generate structured contract test cases from a JSON Schema without writing them manually. It is well-suited for CI pipelines, agent tool testing, and schema regression suites where you have a known valid example and want both positive and negative cases enumerated rapidly. Prefer it over manual case authoring or LLM prompting when you want deterministic, schema-grounded outputs at low cost ($0.01/call).

Side effects

Schema includes unsupported features (references, patterns, formats, composition) — rejected with a validation error
Schema nodes missing explicit single 'type' — rejected as malformed
max_cases out of range (below 2 or above 24) — rejected
valid_example does not match the provided schema — may result in an error or degenerate cases
Payment amount does not match quoted amount — payment rejected
Missing required fields (schema, valid_example, max_cases) — request rejected

Input

Schema · Request body

Field	Type	Description
input	object
version	string
agent_id	string
quote_id	string
prepared_id	string
review_secret_hash	string	Optional SHA-256 hex of caller-kept atbr_ secret (32 random bytes). Bound to this paid request; never send the raw secret here.
payment_amount_atomic	string	Canonical decimal USDC atomic-unit string (6 decimals). Protocol uint256 maximum 115792089237316195423570985008687907853269984665640564039457584007913129639935. No business maximum. Product minimum: 10000. Must equal the exact quoted/signed amount.
max_charge_usdc_atomic	—	Caller spending cap. Canonical decimal string recommended; safe integer numbers accepted for compatibility. Does not select an amount.

Output

Schema · Response

{
  "type": "json"
}

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How this service works

Useful tools for agents. Small requests. Concrete results.

Output

Example use cases

Schema regression suite for a new API

CI test fixtures for a payment request schema

Fuzzing edge cases for an agent tool input

Technical details

Endpoint

POSThttps://agnttoolbx.agenttoolbox2026.workers.dev/v1/products/contract-cases/invoke?utm_source=zero.xyz

When to prefer

Side effects

Schema includes unsupported features (references, patterns, formats, composition) — rejected with a validation error
Schema nodes missing explicit single 'type' — rejected as malformed
max_cases out of range (below 2 or above 24) — rejected
valid_example does not match the provided schema — may result in an error or degenerate cases
Payment amount does not match quoted amount — payment rejected
Missing required fields (schema, valid_example, max_cases) — request rejected

Input

Schema · Request body

Field	Type	Description
input	object
version	string
agent_id	string
quote_id	string
prepared_id	string
review_secret_hash	string	Optional SHA-256 hex of caller-kept atbr_ secret (32 random bytes). Bound to this paid request; never send the raw secret here.
payment_amount_atomic	string	Canonical decimal USDC atomic-unit string (6 decimals). Protocol uint256 maximum 115792089237316195423570985008687907853269984665640564039457584007913129639935. No business maximum. Product minimum: 10000. Must equal the exact quoted/signed amount.
max_charge_usdc_atomic	—	Caller spending cap. Canonical decimal string recommended; safe integer numbers accepted for compatibility. Does not select an amount.

Output

Schema · Response

{
  "type": "json"
}