# FHIR Immunization List – HL7 R4 Test Server

> FHIR Immunization List – HL7 R4 Test Server is a paid API for AI agents from clonecho.builda.company, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Returns a paginated list of FHIR R4 Immunization records from the public HL7 FHIR test server, specified by count.

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/s/fhir-immunization-list
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fhir-immunization-list-hl7-r4-test-server-cd681834
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_I8d9w1N2hk-mcFGLfOiNb

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 fhir-immunization-list-hl7-r4-test-server-cd681834 -d '<json body>'
```

Example prompt: Can you fetch me 10 FHIR R4 Immunization records from the public HL7 test server so I can see what the immunization resource structure looks like?

## When to prefer this

Use this endpoint when you need sample or test FHIR R4 Immunization records for development, testing, or demonstration purposes, and you need a specific number of records in standard HL7 FHIR JSON format. Prefer this over building your own FHIR queries when you just need a quick paginated list of immunization resources.

## Known failure modes

- Invalid or non-integer value for q parameter returns an error or empty result
- Public FHIR test server downtime causes upstream failure
- q=0 or very large q may return empty bundle or timeout
- Missing q parameter may return default page or error

## How this service works

Return a page of {q} FHIR Immunization records from the public HL7 FHIR R4 test server. Query: ?q= Returns JSON.

## Output

A JSON response containing a page of FHIR R4 Immunization resources (as a FHIR Bundle or array), including fields like vaccine code, patient reference, occurrence date, status, and performer, sourced from the public HL7 FHIR R4 test server.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fhir-immunization-list-hl7-r4-test-server-cd681834/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)