# Agent Evidence Labs – Free Seller API Quote & Purchase Guide

> Agent Evidence Labs – Free Seller API Quote & Purchase Guide is a free API for AI agents from agents.agentevidencelabs.com, callable via x402, Free, status healthy (last checked 2026-10-29).

Returns a free, wallet-proof quote with the matching API contract, pricing, prerequisites, and next steps for a described task against the Agent Evidence Labs seller API.

## Facts

- Endpoint: POST https://agents.agentevidencelabs.com/zeroclick/agent/quote?utm_source=zero.xyz
- Price: Free
- Payment: x402
- Status: healthy
- Last checked: 2026-10-29
- Activations on Zero: 0
- Provider: agents.agentevidencelabs.com
- Website: https://agents.agentevidencelabs.com
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agents-agentevidencelabs-com-agent-evidence-labs-free-seller-api-935f024a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_klRKYG06FZW27cFbcGdOD

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 agents-agentevidencelabs-com-agent-evidence-labs-free-seller-api-935f024a -d '<json body>'
```

Example prompt: I want to use Agent Evidence Labs for NSW mining tenement renewal checks — can you get me a free quote describing the API contract, pricing, and what I need to do next, assuming I'll be making roughly 200 calls with a $50 USD budget and paying by card?

## When to prefer this

Use this endpoint before any paid Agent Evidence Labs call to discover the correct API contract, understand pricing, and check prerequisites — especially when an agent is planning autonomously and needs to validate feasibility and cost without spending any money. Prefer this over guessing at the seller's API paths or pricing directly. Also use it when the agent lacks a wallet and needs guidance via the wallet-free path, or when the task is new and the right endpoint or quantity is not yet known.

## Known failure modes

- 'needs_input' status returned when goal description is too vague or missing required context
- 'unsupported' status when the described task has no matching API in the catalog
- 'unavailable' status when the upstream seller API is temporarily unreachable
- 'blocked' status when prerequisites (e.g. authentication, jurisdiction) cannot be satisfied
- 'unknown' status when the system cannot confidently map the goal to a contract
- Validation error if goal exceeds 2000 characters or quantity/budget values are out of allowed range

## How this service works

Describe your task to get the matching API contract, prices, prerequisites and next steps. This is a $0 wallet-proof lookup, not the seller's paid service. No purchase is executed. Without a wallet, use /zeroclick/agent/guide.

## Output

A JSON object containing: a status field (e.g. 'quoted', 'ready', 'needs_input', 'blocked', 'unsupported', 'unavailable', 'unknown'), a priceUsd field always equal to '0' (this lookup is free), a guide field with Markdown-formatted guidance covering the task result, exact API contract, pricing breakdown, and next steps, and a guideUrl pointing to a wallet-free advisor endpoint for further planning or error recovery.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "goal"
 ],
 "properties": {
  "goal": {
   "type": "string",
   "maxLength": 2000,
   "minLength": 1,
   "description": "Describe the task and known inputs. Do not include credentials."
  },
  "payment": {
   "enum": [
    "card"
   ],
   "type": "string",
   "description": "Known payment method for the eventual purchase. This seller accepts card payments only."
  },
  "quantity": {
   "type": "integer",
   "maximum": 1000000,
   "minimum": 1,
   "description": "Number of API calls, not returned items. Omit when unknown; describe desired output in goal."
  },
  "budgetUsd": {
   "type": "string",
   "pattern": "^(0|[1-9]\\d{0,8})(\\.\\d{1,6})?$",
   "description": "Total cash budget in USD. A quote does not authorize spending."
  },
  "requirements": {
   "type": "string",
   "maxLength": 300,
   "minLength": 1
  },
  "humanAvailable": {
   "type": "boolean",
   "description": "Whether a human is in the loop. False recommends anonymous auth for a new autonomous identity; omit when unknown. Executing a human's request without further interruptions does not by itself mean false."
  },
  "budgetExclusive": {
   "type": "boolean"
  },
  "reviewAfterCalls": {
   "type": "integer",
   "maximum": 1000000,
   "minimum": 1
  }
 },
 "additionalProperties": false
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "status",
  "priceUsd",
  "guide",
  "guideUrl"
 ],
 "properties": {
  "guide": {
   "type": "string",
   "description": "Markdown guidance containing the task result, exact contract, pricing and next steps when available. No purchase is executed."
  },
  "status": {
   "enum": [
    "quoted",
    "catalog",
    "ready",
    "needs_input",
    "blocked",
    "unknown",
    "unsupported",
    "unavailable"
   ],
   "type": "string"
  },
  "guideUrl": {
   "type": "string",
   "format": "uri",
   "description": "Wallet-free advisor endpoint for further planning or recovery."
  },
  "priceUsd": {
   "type": "string",
   "const": "0"
  }
 },
 "additionalProperties": false
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agents-agentevidencelabs-com-agent-evidence-labs-free-seller-api-935f024a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agents.agentevidencelabs.com](https://www.zero.xyz/host/agents.agentevidencelabs.com/llms.txt)