# Zero Signal Phase0 Capability Taxonomy Resolver

> Zero Signal Phase0 Capability Taxonomy Resolver is a paid API for AI agents from zero-signal-phase0.polar-tern.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Evaluates a non-personal capability taxonomy identifier and returns a synthetic match signal indicating relevance or alignment

## Facts

- Endpoint: POST https://zero-signal-phase0.polar-tern.workers.dev/v1/resolve/x402
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/zero-signal-phase0-capability-taxonomy-resolver-d1833c97
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a8o4pFiSs_Kd5jwZ0r80z

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 zero-signal-phase0-capability-taxonomy-resolver-d1833c97 -d '<json body>'
```

Example prompt: Can you resolve capability taxonomy identifier 'CAP-042' through the zero-signal phase0 resolver and tell me what synthetic match signal comes back?

## When to prefer this

Use this endpoint when you need to evaluate a specific non-personal capability taxonomy identifier against a synthetic match signal framework, particularly in workflows involving x402-protocol-gated capability discovery or classification pipelines built around the polar-tern worker infrastructure.

## Known failure modes

- Invalid or unrecognized taxonomy identifier returns no match or error signal
- Malformed POST body causes 400 bad request
- Payment failure via x402 protocol prevents resolution
- Identifier outside supported taxonomy namespace returns null or zero signal
- Rate limiting or worker timeout on the Cloudflare edge returns 5xx

## How this service works

Evaluate a non-personal capability taxonomy identifier and return a synthetic match signal

## Output

Returns a synthetic match signal indicating the degree or nature of alignment between the submitted capability taxonomy identifier and known taxonomy entries; likely includes a match score or boolean signal along with relevant metadata about the resolved identifier.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/zero-signal-phase0-capability-taxonomy-resolver-d1833c97/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from zero-signal-phase0.polar-tern.workers.dev](https://www.zero.xyz/host/zero-signal-phase0.polar-tern.workers.dev/llms.txt)