# SALT19 Base Transaction Status

> SALT19 Base Transaction Status is a paid API for AI agents from api.salt19.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Looks up the on-chain status of a Base (EVM) transaction by its hash, returning state, network, gas used, and block number

## Facts

- Endpoint: POST https://api.salt19.com/v1/base-transaction-status
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/salt19-base-transaction-status-aae8d3d8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_i3nb5uqObWPgNZTPJ-dah

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability salt19-base-transaction-status-aae8d3d8 -d '<json body>'
```

Example prompt: Can you check the status of my Base network transaction 0x3f1a2b...d4e5 — I want to know if it's still pending or has been confirmed and what block it landed in?

## When to prefer this

Use this endpoint when you need to check the status of a specific transaction on the Base (EIP-155:8453) network and want a simple, structured JSON response with state, gas, and block info. Prefer it over raw RPC calls when operating within the SALT19 Agent Utility Grid or when you need a metered, agent-friendly interface without managing your own RPC provider.

## Known failure modes

- Invalid transaction hash format (not matching ^0x[0-9a-fA-F]{64}$) returns a validation error
- Transaction hash not found on the Base network returns a not-found or unknown state
- Network connectivity issues to the Base RPC may cause timeouts
- Payment of $0.01 USDC required per call; missing or invalid x402 payment header will result in 402 Payment Required

## How this service works

SALT19 is an independent applied AI systems lab behind EvoMind governed cognition, the MCP-native Agent Utility Grid, the ARCS research community, AeroClear UAS flight intelligence, and practical software for real-world work.

## Output

A JSON object containing the transaction state (e.g. PENDING, CONFIRMED), the network identifier (e.g. eip155:8453 for Base), gas used (null if not yet mined), and the block number (null if not yet mined).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "transaction_hash": {
   "type": "string",
   "pattern": "^0x[0-9a-fA-F]{64}$"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "state": "PENDING",
  "network": "eip155:8453",
  "gas_used": null,
  "block_number": null
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/salt19-base-transaction-status-aae8d3d8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.salt19.com](https://www.zero.xyz/host/api.salt19.com/llms.txt)