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Animica Post-Quantum JSON Envelope Signing
x402
Animica Post-Quantum JSON Envelope Signing is a paid API for AI agents from animica.dev, paid per call via x402, $0.0018/call, status unknown (last checked 2026-09-14).
Seals any JSON value in a post-quantum ML-DSA-65 (FIPS 204) signed envelope with SHA3-256 canonicalisation, proving integrity and Animica-origin across brokers, caches, and resellers.
Price / call$0.0018
Success—
StatusUnknown
How this service works
Seal any JSON in a post-quantum signed envelope: canonicalise (keys sorted, stable bytes), SHA3-256, then sign that digest with ML-DSA-65 (FIPS 204, scheme 4099) — the scheme the Animica L1 admits transactions with. Buy it when a response you emit must cross a broker, cache or reseller and still be provably unaltered. Proves INTEGRITY and ANIMICA ORIGIN, not that the content is true and not anyone's real-world identity. Key and verification are free. No signature, no charge.
Output
A signed envelope object containing: the ML-DSA-65 signature over the SHA3-256 digest of the canonicalised JSON, the digest itself, the label bound inside the signature, metadata about the signing scheme (FIPS 204 / scheme 4099), optionally the canonical byte representation of the payload, and optionally an observed Animica chain head (height + hash) as a temporal lower-bound anchor.
Example use cases
Tamper-proof agent API responses
“I'm about to send this JSON price response through a reseller channel — please seal it in a post-quantum signed envelope with the label 'market-data:feed' so recipients can verify it came from us unaltered: {"asset": "BTC", "price": 67500, "ts": 1720000000}.”
Blockchain-anchored compliance record
“Sign this compliance report JSON with an Animica ML-DSA-65 envelope, anchor it to the chain head for a timestamp lower bound, and use the label 'compliance:audit-2024' — I need proof of when and from whom it was issued: {"report_id": "CR-9921", "status": "passed", "auditor": "acme-corp"}.”
Debug canonicalisation for interop
“Seal this small JSON object with label 'test:canon' and also return the exact canonical bytes so I can check my own canonicalisation logic matches yours: {"z": 1, "a": 2, "m": 3}.”
Technical details
Endpoint
POSThttps://animica.dev/x402/pq/envelopeWhen to prefer
Choose this endpoint when a JSON payload must cross an untrusted intermediary — broker, cache, reseller, or multi-agent pipeline — and the receiver needs cryptographic proof that the content originated from Animica and was not altered in transit. Prefer it over classical ECDSA or RSA signing when quantum-resistance is required (FIPS 204 / ML-DSA-65). Use the anchor_chain option when a verifiable temporal lower bound is needed without writing anything to the chain.
Side effects
- 503 with no charge if anchor_chain is true and the Animica node is unreachable
- Malformed or oversized label (over 64 chars or invalid characters) returns a 4xx error
- Payload that cannot be JSON-serialised returns a validation error
- Payment not provided or insufficient results in a 402 response with challenge details
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| label | string | your filing tag, bound INSIDE the signature as kind "api-response/<label>". Up to 64 chars of [A-Za-z0-9._:- ]. Namespaced so it can never impersonate one of this gateway's own attestations. |
| payload | — | the JSON value to seal — object, array, string, number, boolean or null. Sealed verbatim; nothing is normalised, rewritten or interpreted. |
| anchor_chain | boolean | default false. When true the signed object also carries an observed Animica chain head {height, hash}: a lower bound on when the seal happened that this gateway cannot inflate, because a block hash cannot exist before its block. Nothing is written to the chain — the head is read from a node. If the node is unreachable the call 503s and you are NOT charged. |
| include_canonical_form | boolean | default false. Return the exact hashed bytes (only when under 8192 chars) as a debugging aid for canonicalisation interop. |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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