# Firely FHIR R4 Observation List

> Firely FHIR R4 Observation List is a paid API for AI agents from clonecho.builda.company, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Lists Observation resources from the public Firely FHIR R4 server, returning a specified number of entries as a FHIR Bundle in JSON format.

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/s/firely-fhir-observation-list
- 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/firely-fhir-r4-observation-list-91b7687e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KPT_UvFvUnzIp48WHUM0C

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 firely-fhir-r4-observation-list-91b7687e -d '<json body>'
```

Example prompt: Pull 10 Observation resources from the public Firely FHIR R4 server and give me the results as a FHIR Bundle.

## When to prefer this

Choose this endpoint when you need to access real FHIR R4 Observation data from the public Firely reference server for testing, prototyping, or healthcare interoperability workflows. Ideal when you want a standards-compliant FHIR Bundle without maintaining your own FHIR infrastructure.

## Known failure modes

- Invalid or missing q parameter may return an empty bundle or error
- Upstream Firely server.fire.ly unavailability causes request failure
- Non-integer q value may cause a parse or validation error
- Rate limiting or payment failure may block the request
- q value too large may result in timeout or partial results

## How this service works

List Observation resources from the public Firely (server.fire.ly) FHIR R4 server, returning {q} observation entries as a FHIR Bundle. Query: ?q= Returns JSON.

## Output

A FHIR R4 Bundle in JSON format containing the requested number of Observation resources, including standard FHIR fields such as resource type, id, status, code, subject, effectiveDateTime, and value.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/firely-fhir-r4-observation-list-91b7687e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clonecho.builda.company](https://www.zero.xyz/host/clonecho.builda.company/llms.txt)