# [SAMPLE / TEST CONTENT] ATK Magazine (EXAMPLE, NOT PUBLISHED)

> Per-article x402 v2 on Base mainnet. $0.20 per article (USDC on Base mainnet; SAMPLE / TEST CONTENT, not a published article).

All content here is SAMPLE / TEST CONTENT. Nothing is a published article; paid responses return a JSON excerpt/placeholder only.

## How to buy one article

1. GET the pay URL. Without payment it answers HTTP 402 with a base64 `PAYMENT-REQUIRED` header (x402 v2).
2. Terms: scheme exact, network eip155:8453 (Base mainnet), asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USDC contract), amount 200000 (6 decimals = 0.20 USDC), payTo 0x3Ba0697Ac5A3abE7e6b467af8abB6D7ddEcbd92c, maxTimeoutSeconds 120.
3. Retry with a signed `PAYMENT-SIGNATURE` header. Browsers get a wallet paywall page instead.

Free: landing pages, JSON-LD, https://atk-bazaar-linec-production.up.railway.app/api/search?q=..., MCP tool `search` at https://atk-bazaar-linec-production.up.railway.app/mcp (abstracts and prices only).

## Articles

### [SAMPLE / TEST CONTENT] [EXAMPLE] SIGNAL: ResearchAgent pays writers per article with x402 v2 (upstream testnet demo)

- id: atk-signal-2026-10-researchagent-x402 (version v1)
- status: draft / example, not published
- abstract: EXAMPLE, not published. A public demo agent buys single paywalled articles inside a user budget, checks signed promises after delivery, and claws back money on-chain when a promise breaks.
- tags: example, agent-economy, x402, testnet-demo, paid-retrieval
- landing page (free): https://atk-bazaar-linec-production.up.railway.app/articles/atk-signal-2026-10-researchagent-x402
- JSON-LD (free): https://atk-bazaar-linec-production.up.railway.app/ld/atk-signal-2026-10-researchagent-x402.jsonld
- pay (x402, 0.20 USDC on Base mainnet): https://atk-bazaar-linec-production.up.railway.app/bazaar/atk-magazine/articles/atk-signal-2026-10-researchagent-x402

### [SAMPLE / TEST CONTENT] [EXAMPLE] ATK VERIFY: three numbers on the ResearchAgent project map, checked against its source

- id: atk-verify-2026-10-project-map-numbers (version v1)
- status: draft / example, not published
- abstract: EXAMPLE, not published. We rechecked an honesty penalty, a currency-conversion example and the corpus size against code and repo history. One holds, one is off tenfold, one uses an older count.
- tags: example, atk-verify, agent-economy, trust-score, x402
- landing page (free): https://atk-bazaar-linec-production.up.railway.app/articles/atk-verify-2026-10-project-map-numbers
- JSON-LD (free): https://atk-bazaar-linec-production.up.railway.app/ld/atk-verify-2026-10-project-map-numbers.jsonld
- pay (x402, 0.20 USDC on Base mainnet): https://atk-bazaar-linec-production.up.railway.app/bazaar/atk-magazine/articles/atk-verify-2026-10-project-map-numbers

## Machine interfaces

- [OpenAPI](https://atk-bazaar-linec-production.up.railway.app/openapi.json)
- [x402 resources](https://atk-bazaar-linec-production.up.railway.app/.well-known/x402)
- [MCP endpoint](https://atk-bazaar-linec-production.up.railway.app/mcp)
- [Sitemap](https://atk-bazaar-linec-production.up.railway.app/sitemap.xml)