# Kallipolis Proof — Evidence Resolution API

> Kallipolis Proof — Evidence Resolution API is a paid API for AI agents from kallipolis-proof.handongzhen101.chatgpt.site, paid per call via x402, $19/call, status unknown (last checked 2026-09-15).

Purchases prepaid API access (credits/API key) for evidence resolution queries covering AI agents, domains, protocols, and Base blockchain accounts.

## Facts

- Endpoint: POST https://kallipolis-proof.handongzhen101.chatgpt.site/api/v1/purchase
- Price: $19/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kallipolis-proof-evidence-resolution-api-c06ba596
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4Q-gI-vA_5nuxY58hT7OV

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 kallipolis-proof-evidence-resolution-api-c06ba596 -d '<json body>'
```

Example prompt: I need to verify evidence for my AI agent's Base account and domains — can you buy me a Kallipolis Proof builder plan so I get an API key with 100 credits to start resolving evidence queries?

## When to prefer this

Choose this endpoint when an agent or user needs to bootstrap access to Kallipolis Proof's evidence resolution capabilities by purchasing an API key with prepaid credits. Use this before making evidence resolution calls — it is the provisioning/payment step, not the resolution step itself. Prefer this over pay-per-call if you need sustained, high-volume access to evidence queries.

## Known failure modes

- Payment failure if USDC balance is insufficient or x402 transaction is rejected
- Invalid plan type results in error response
- Duplicate purchase attempts may not be idempotent — could result in multiple charges
- Network/gateway errors may interrupt payment flow before key is issued
- Rate limiting if too many purchase requests are made in a short window

## How this service works

Evidence resolution API for AI agents, domains, protocols, and Base accounts. Pay per call with x402 or buy instant prepaid access.

## Output

Returns a JSON object containing the purchased plan name (e.g. 'builder'), a generated API key prefixed with 'kp_', the header name to use for authentication ('x-api-key'), and the number of prepaid credits included (e.g. 100).

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "plan": "builder",
  "apiKey": "kp_...",
  "header": "x-api-key",
  "credits": 100
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/kallipolis-proof-evidence-resolution-api-c06ba596/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kallipolis-proof.handongzhen101.chatgpt.site](https://www.zero.xyz/host/kallipolis-proof.handongzhen101.chatgpt.site/llms.txt)