Travel · x402

Find out why an Animica transaction would be rejected BEFORE you broadcast it

by animica.dev · discovered, not yet claimed by its owner · updated 2026-08-23

Not responding. This endpoint did not answer its last liveness check (2026-10-13). It may be temporarily down.

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

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.

Tags: animica · bazaar · discovery

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/7538.json for the price and payment options.
Pay. Call GET https://animica.dev/x402/tx/preflight. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, animica:1, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.006 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, animica:1
Uptime: 0 of the last 1 checks answered
Calls (30d): 1 · 1 unique payers (third-party data from the public x402 Bazaar)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.006	0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD	60s
exact	animica:1 animica:1	ANM	71519389701	anim1zqpsmegc0qcvzjfukm89xs0zeu3eqyyyel7kelehuszvwfarqypky2gr946ga	60s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "6000",
    "amountUsd": 0.006,
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "animica:1",
    "payTo": "anim1zqpsmegc0qcvzjfukm89xs0zeu3eqyyyel7kelehuszvwfarqypky2gr946ga",
    "asset": "ANM",
    "amount": "71519389701",
    "maxTimeoutSeconds": 60
  }
]

Schemas

Output schema (JSON Schema)

{
  "animica": {
    "catalog": "https://animica.dev/.well-known/x402",
    "content_type": "application/json",
    "currency": "USDC",
    "description": "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.",
    "documentation": "https://animica.dev/x402#product-tx_preflight",
    "name": "Animica transaction preflight — decode and admission dry-run",
    "openapi": "https://animica.dev/x402/openapi.json",
    "price": "0.006000",
    "product": "tx_preflight",
    "provider": "Animica",
    "terms": {
      "amount_atomic": "6000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "chain_id": 8453,
      "network": "eip155:8453",
      "pay_to": "0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD",
      "scheme": "exact"
    },
    "x402_version": 2
  },
  "bazaar": {
    "discoverable": true,
    "info": {
      "input": {
        "body": {
          "raw_tx": "0xa264626f6479a761760163676173a2656c696d69741952086570726963651a001bf5386466726f6d784030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030656e6f6e63650067636861696e496401677061796c6f6164a26174006176a362746f78403131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313164646174616066616d6f756e74016a6163636573734c69737480647369677380"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "properties": {
            "body": {
              "properties": {
                "raw_tx": {
                  "description": "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.",
                  "type": "string"
                },
                "skip_admission": {
                  "description": "decode only, skipping the admission dry-run (default false). Useful when you are iterating on encoding and do not yet have signatures attached.",
                  "type": "boolean"
                }
              },
              "required": [
                "raw_tx"
              ],
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "queryParams": {
              "properties": {
                "raw_tx": {
                  "description": "same as body.raw_tx for GET callers",
                  "type": "string"
                },
                "skip_admission": {
                  "description": "same as body.skip_admission (\"1\"/\"true\")",
                  "type": "string"
                }
              },
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {},
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  },
  "discovery": {
    "discoverable": true,
    "info": {
      "input": {
        "bodyFields": {
          "raw_tx": {
            "description": "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.",
            "required": true,
            "type": "string"
          },
          "skip_admission": {
            "description": "decode only, skipping the admission dry-run (default false). Useful when you are iterating on encoding and do not yet have signatures attached.",
            "required": false,
            "type": "boolean"
          }
        },
        "bodyType": "json",
        "method": "POST",
        "queryParams": {
          "raw_tx": {
            "description": "same as body.raw_tx for GET callers",
            "type": "string"
          },
          "skip_admission": {
            "description": "same as body.skip_admission (\"1\"/\"true\")",
            "type": "string"
          }
        },
        "type": "http"
      },
      "output": {
        "description": "as_of {read_at}; input {bytes, hex_chars}; decode {ok, canonical_hash, type, decoded_length, transaction, error {message, code, kind, cause, hint}}; admission {checked, allowed, txid, wtxid, reject_reason, error, note}; next_step; what_we_have_observed; broadcast {performed:false, how_to}; inference {used:false}.",
        "type": "json"
      }
    }
  }
}

Example shape — generated from the schema, not a captured live response

null

Examples

curl

curl "https://animica.dev/x402/tx/preflight"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://animica.dev/x402/tx/preflight");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://animica.dev/x402/tx/preflight")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: animica.dev
Endpoint: https://animica.dev/x402/tx/preflight
Machine-readable: /resources/7538.json