# pulsefeed.dev Lab Insertion-Path Positive Control (e1)

> pulsefeed.dev Lab Insertion-Path Positive Control (e1) is a paid API for AI agents from pulsefeed.dev, paid per call via x402, $0.011/call, status unknown (last checked 2026-10-10).

Acts as an insertion-path positive control for a measurement experiment, confirming whether a v1-envelope x402 settlement still creates a catalog row at the current epoch by returning a static acknowledgement.

## Facts

- Endpoint: POST https://pulsefeed.dev/lab/e1?utm_source=zero.xyz
- Price: $0.011/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pulsefeed-dev-lab-insertion-path-positive-control-e1-3e196be8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_06OQMGHy0ANMRnTZ19kOU

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 pulsefeed-dev-lab-insertion-path-positive-control-e1-3e196be8 -d '<json body>'
```

Example prompt: Run the x402 insertion-path positive control probe at pulsefeed.dev to confirm that a v1-envelope settlement still creates a catalog row at the current epoch and give me the static acknowledgement back.

## When to prefer this

Use this endpoint when you need a positive control baseline for x402 settlement and catalog insertion experiments — specifically when you need to confirm that v1-envelope settlements correctly register catalog rows at the current epoch. It is a diagnostic/measurement tool, not a production data endpoint.

## Known failure modes

- Non-200 HTTP response if the service is down or misconfigured
- Payment settlement failure if x402 protocol handshake is incomplete
- Static acknowledgement may not reflect real-time catalog state beyond epoch confirmation
- Network timeout if pulsefeed.dev infrastructure is unavailable

## How this service works

Insertion-path positive control for a measurement experiment (x402-foundation/x402#3045): does a v1-envelope settlement still create a catalog row at the current epoch? Returns a static acknowledgement.

## Output

A static acknowledgement confirming whether a v1-envelope x402 settlement creates a catalog row at the current epoch. The response serves as a positive control signal for measurement experiments, indicating the insertion path is functioning correctly.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pulsefeed-dev-lab-insertion-path-positive-control-e1-3e196be8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pulsefeed.dev](https://www.zero.xyz/host/pulsefeed.dev/llms.txt)