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Animica Transaction Preflight
x402
Animica Transaction Preflight 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).
Decodes a raw Animica CBOR transaction and performs a read-only admission dry-run against the node to reveal why it would be rejected before broadcast
Price / call$0.0018
Success—
StatusUnknown
How this service works
Find out why an Animica transaction would be rejected BEFORE you broadcast it. Decodes your canonical CBOR {body, sigs} envelope, returns the normalised fields and the CANONICAL HASH you are about to sign, then asks the node whether it would admit the transaction and why not. Both calls are read-only: nothing is inserted into the mempool and nothing is broadcast. Built for people writing Animica signers, where the alternative feedback loop is broadcast-and-see. No model.
Output
Returns the decoded normalised transaction fields, the canonical hash that will be signed, and (unless skip_admission is true) the node's admission dry-run result including any rejection reason — all without inserting anything into the mempool or broadcasting.
Example use cases
Debug rejected transaction before broadcast
“I keep getting rejections when I broadcast this Animica transaction. Can you run a preflight on this hex 0xd84f82a4... and tell me exactly why the node would reject it and what the decoded fields look like?”
Get canonical hash for signer development
“I'm building an Animica signer and need to verify I'm signing the right canonical hash — can you decode this CBOR hex 0xa50183... with skip_admission turned on and just show me the normalised fields and hash without hitting the node?”
Validate CBOR encoding before attaching signatures
“I've constructed an Animica transaction body but haven't attached signatures yet — can you preflight this hex 0xd81e9f... with decode-only mode to check whether my CBOR key ordering is canonical before I sign it?”
Technical details
Endpoint
POSThttps://animica.dev/x402/tx/preflightWhen to prefer
Use this endpoint when you are developing an Animica transaction signer or encoder and need to validate correctness before broadcast — especially when debugging CBOR encoding issues like non-canonical key ordering, verifying the canonical hash before signing, or understanding node admission rules. It is the only read-only preflight check that combines both CBOR decoding and live node admission simulation in a single call without side effects.
Side effects
- Non-canonical CBOR key ordering causes decoder to reject with explicit naming of the encoding error
- Malformed or truncated hex input returns a decode error
- Invalid 0x prefix handling if hex is malformed
- Node unreachable causes admission dry-run to fail even if decode succeeds
- Missing required body or sigs fields in the CBOR envelope returns a structural validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| raw_tx | string | the transaction as hex, 0x-prefixed or not. Animica expects canonical CBOR of {body, sigs} with strictly-increasing map keys — non-canonical key order is the most common first failure and the decoder names it explicitly. |
| skip_admission | boolean | decode only, skipping the admission dry-run (default false). Useful when you are iterating on encoding and do not yet have signatures attached. |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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