# Signal Nodus Credit Registration

> Signal Nodus Credit Registration is a paid API for AI agents from api.signalnodus.ai, paid per call via x402, $9/call, status unknown (last checked 2026-09-15).

Registers a new Signal Nodus account by settling an x402 payment, returning an API key and credit balance for accessing SEC filing year-over-year diff data.

## Facts

- Endpoint: GET https://api.signalnodus.ai/v1/credit
- Price: $9/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signal-nodus-credit-registration-04b3c49f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zmuuavK0fFbRR6oDA6Ixp

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 signal-nodus-credit-registration-04b3c49f
```

Example prompt: I want to start using Signal Nodus to pull year-over-year diffs of SEC filing sections — go ahead and register me by settling the 9 USDC payment so I get an API key and $10 in credit.

## When to prefer this

Use this endpoint when you need to provision a new Signal Nodus API key and initial credit balance to access SEC filing year-over-year diff data. This is the entry point for the Signal Nodus platform; there is no separate account sign-up flow — settling the x402 payment IS the registration. Prefer this over manual account creation portals when building automated agent workflows that need self-provisioning access to SEC filing comparative analysis.

## Known failure modes

- Payment not settled — no API key or credit returned if the x402 payment fails or is rejected
- Insufficient USDC balance — payment cannot be processed if the caller lacks the required 9 USDC
- Network timeout — payment may be in-flight but response not received, risking duplicate payment attempts
- Invalid payment channel — x402 protocol misconfiguration results in 402 response without fulfillment

## How this service works

Signal Nodus: year-over-year diffs of SEC filing sections, pinned to accession numbers. The diff is the product; raw data is the on-ramp.

## Output

Returns a JSON object containing a confirmation note that payment settlement constitutes registration (no separate account creation needed), a starting credit balance (e.g. '$10.00'), and a live API key (prefixed 'sn_live_') that can be used to query Signal Nodus's SEC filing year-over-year diff endpoints.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "settling the 402 IS the registration; no account exists",
  "credit": "$10.00",
  "api_key": "sn_live_..."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signal-nodus-credit-registration-04b3c49f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.signalnodus.ai](https://www.zero.xyz/host/api.signalnodus.ai/llms.txt)