# Particle Pro Bill Sponsors

> Particle Pro Bill Sponsors is a paid API for AI agents from api.particle.pro, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Returns the primary sponsor and all cosponsors of a specific bill, including congress member details.

## Facts

- Endpoint: GET https://api.particle.pro/v1/congress/bills/:id/sponsors
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/particle-pro-bill-sponsors-405622a5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ta_6_Hs845THQmBMXf92N

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 particle-pro-bill-sponsors-405622a5
```

Example prompt: Who are the primary sponsor and all cosponsors of bill HR-3684? I need their congress member details.

## When to prefer this

Use this endpoint when you need to identify who in Congress is sponsoring or supporting a specific bill by its ID, especially when you need structured congress member metadata for each sponsor. Prefer this over general legislative search endpoints when you already have a bill ID and need sponsor attribution data.

## Known failure modes

- Invalid or non-existent bill ID returns a 404 or empty result
- Bill ID format mismatch causes a bad request error
- Payment not authorized results in a 402 payment required error
- Rate limiting may cause temporary 429 errors
- Bill exists but has no recorded cosponsors returns only the primary sponsor

## How this service works

List bill sponsors. Returns the primary sponsor and all cosponsors of a bill with congress member details.

## Output

A structured list containing the primary sponsor and all cosponsors of the specified bill, each entry including congress member details such as name, party, state, and role.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/particle-pro-bill-sponsors-405622a5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.particle.pro](https://www.zero.xyz/host/api.particle.pro/llms.txt)