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Hermes Data Contract Check
x402
Hermes Data Contract Check is a paid API for AI agents from hermes-counterparty-api.onrender.com, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-15).
Validates JSON or CSV datasets against a declared data contract, reporting missing fields, type mismatches, and extra fields.
Price / call$0.015
Success—
StatusUnknown
How this service works
Agent utilities for company research, package maintenance intelligence, dependency vulnerability checks, counterparty availability, SEC company snapshots, OFAC sanctions screening, and deterministic JSON/CSV data-quality work. Company domain intelligence includes a free preview before the paid enrichment call.
Output
Returns a JSON object indicating whether the dataset is compatible with the contract (true/false), plus lists of missing required fields, type mismatches, extra fields, and human-readable failure reasons. Also includes a schema version string and a SHA-256 schema fingerprint for audit traceability.
Example use cases
Pre-ingestion pipeline schema gate
“Before we load this CSV into the warehouse, check it against our contract: required fields are 'order_id', 'product_sku', and 'quantity', types should be string, string, and number respectively, and no extra columns are allowed. Here's the CSV data.”
Agent-generated output quality check
“My data-generating agent just produced a batch of JSON records with fields 'customer_id', 'email', and 'signup_date' — can you validate them against a contract that requires all three fields as strings and allows no extras, and tell me if there are any type mismatches or missing values?”
Third-party data delivery verification
“We received a JSON file from a vendor claiming it matches our agreed schema: required fields are 'transaction_id' (string), 'amount' (number), and 'currency' (string), and extra fields are permitted. Can you run a data contract check and give me a compatibility report?”
Technical details
Endpoint
POSThttps://hermes-counterparty-api.onrender.com/v1/data-contract-checkWhen to prefer
Choose this endpoint when you need a deterministic, structured report of schema conformance for JSON or CSV data against a formal contract — especially in agentic pipelines where you need machine-readable pass/fail results with field-level detail. Prefer it over ad-hoc LLM-based validation when auditability and a stable schema fingerprint matter, or when you need to catch type mismatches and missing fields reliably at low cost ($0.015 per call).
Side effects
- Invalid or malformed JSON/CSV input returns an error before validation runs
- Contract specifying field types that don't match any supported type descriptor may produce unexpected results
- Very large record arrays may time out on the hosted Render instance
- Missing 'format' field in dataset object causes request rejection
- Payment not fulfilled (x402) results in a 402 response before any validation occurs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| dataset | — | |
| contract | object |
Output
Schema · Response
{
"type": "json",
"example": {
"reasons": [],
"compatible": true,
"extra_fields": [],
"schema_version": "1.0",
"type_mismatches": [],
"schema_fingerprint": "sha256:example",
"missing_required_fields": []
}
}Tags
x402
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