# Pricing State API – Devtools Set Change Feed

> Pricing State API – Devtools Set Change Feed is a paid API for AI agents from pricing-state-api.replit.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Returns a paginated, cursor-based feed of pricing changes across all devtools-category products, newest first, charged only when results exist.

## Facts

- Endpoint: GET https://pricing-state-api.replit.app/api/sets/devtools/changes?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pricing-state-api-devtools-set-change-feed-99c33bd1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sg3LlCUFhrfPS7ZXNnI3f

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 pricing-state-api-devtools-set-change-feed-99c33bd1
```

Example prompt: Check the devtools pricing change feed for any updates since 2025-06-01T00:00:00Z and return the first 20 results — pay the $0.01 USDC fee automatically if there's anything new to report.

## When to prefer this

Use this endpoint when you need to monitor or batch-collect pricing changes across the entire devtools product category rather than a single slug. It is the right choice for change-polling agents, competitive intelligence pipelines, and pricing dashboards that need to process multiple devtools products at once. Prefer it over per-slug endpoints when you don't know which slugs changed and want a unified feed with cursor-based resumption.

## Known failure modes

- Empty result window: returns HTTP 200 with charged=false and no payment deducted
- Payment failure: x402 wallet lacks sufficient USDC on Base, request blocked
- Invalid since timestamp format: rejected if not ISO 8601 with timezone
- Invalid before cursor: rejected if cursor string is malformed or expired
- Rate limits or server errors from the Replit-hosted API
- Limit parameter out of range (must be 1–100)

## How this service works

$0.01 USDC required (x402 / Base)

Paid 0.01 USDC, and only when there is something to deliver. Changes recorded across every member of a named set (inference or devtools) after your since cursor, newest first, each with the slug, detection time, source page and the same change object the per-slug endpoint returns. An empty window is answered free (charged false) and never reaches this paywall. Public list prices only; not negotiated rates.

No API key needed. Pay with any x402-compatible wallet that holds USDC on Base. If your agent does not yet have a funded wallet, set one up via Coinbase Agentic Wallet or Base MCP — then standard x402 clients will pay and retry automatically.

## Output

A paginated JSON array of pricing change records across all devtools-set products after the given cursor, each including slug, detection timestamp, source page URL, and the same structured change object as the per-slug endpoint. Includes a nextBefore opaque cursor for subsequent requests and a charged boolean (false when the result window is empty and no payment was taken).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "set"
     ],
     "properties": {
      "set": {
       "enum": [
        "inference",
        "devtools"
       ],
       "type": "string",
       "example": "inference",
       "description": "One named set: inference or devtools (free: GET /api/sets)."
      }
     }
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "limit": {
       "type": "integer",
       "default": 20,
       "example": 20,
       "maximum": 100,
       "minimum": 1
      },
      "since": {
       "type": "string",
       "example": "2026-09-01T00:00:00Z",
       "description": "ISO 8601 timestamp with a zone. Only changes detected strictly after it are returned; an empty window is free. Pass back the previous response's cursor."
      },
      "before": {
       "type": "string",
       "pattern": "^[A-Za-z0-9_-]{8,128}$",
       "description": "Opaque cursor from a previous response's nextBefore (optional)."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pricing-state-api-devtools-set-change-feed-99c33bd1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pricing-state-api.replit.app](https://www.zero.xyz/host/pricing-state-api.replit.app/llms.txt)