Agent Exchange x402 census and directory

x402 census · mcp.whitemagic.dev · 8fb47a1c98b4 · JSON

POST /mcp

live

WhiteMagic hosted recall: read-only hybrid memory search (BM25 + vector + associative) over a curated public corpus for agent continuity. Call when an agent needs durable context from prior sessions or the public knowledge store. Keyless discovery (initialize/tools/list) is free; free evaluation keys and a daily no-key trial are available. One paid tool call per payment.

Verdict: live. The unpaid GET reached a valid 402 (confirmed by the re-probe of 2026-10-02).

Facts from the catalogs

FieldValue
URLhttps://mcp.whitemagic.dev/mcp
MethodPOST
Price$0.01 USDC = 10000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Networkeip155:8453 (base); also accepts base
payTo0x213b6bB4fB073E86167c58DA6Cb6E9477557DaA8
Sellermcp.whitemagic.dev
Catalogscdp (row updated 2026-09-28), payai (row updated 2026-09-24)
Listed since (lower bound)2026-09-24 (earliest catalog timestamp; catalogs report last-update times only)
Last catalog update2026-09-28
CDP quality counters3 calls and 2 unique payers in 30 days, last call 2026-09-28 (catalog-reported, not verified on chain)
Category (keyword rule)storage/memory
Templated pathno
x402Version in catalog2
Service name / tagsnone

Unpaid probe (census of )

FieldValue
Probenot probed in this build

Latest re-probe

FieldValue
Re-probed at2026-10-02T08:13:42.000Z (cron)
Verdict nowlive changed from unprobed
HEAD / GET402 / 402
accepts[0]{"scheme":"exact","network":"eip155:8453","amount":"2000","payTo":"0x213b6bB4fB073E86167c58DA6Cb6E9477557DaA8","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","maxTimeoutSeconds":60,"extra":{"name":"USD Coin","version":"2"}}
Live amount equals catalog priceno
Latency1,537 ms
Errornone

On-chain facts for the payTo (public address)

FieldValue
Distinct payers1
Payments2
USDC volume$0.02
Median payment$0.01
First / last payment2026-09-30 / 2026-09-30
Sampler-shaped share of payments100.0%
Payers that are not samplers0
Sourceforensics-2026-09-30
Address0x213b6bB4fB073E86167c58DA6Cb6E9477557DaA8

Declared input and output (extensions.bazaar)

{
 "input": {
  "body": {
   "id": 1,
   "jsonrpc": "2.0",
   "method": "tools/call",
   "params": {
    "arguments": {
     "query": "recall where we left off"
    },
    "name": "memory.search"
   }
  },
  "bodyType": "json",
  "description": "Any read-only recall call (memory.search/read/list/hybrid_recall/count/stats, session.list/recall/continuity, gnosis.status); initialize and tools/list are free.",
  "method": "POST",
  "path": "/mcp",
  "type": "http"
 },
 "output": {
  "example": {
   "id": 1,
   "jsonrpc": "2.0",
   "result": {
    "content": [
     {
      "text": "recall results",
      "type": "text"
     }
    ]
   }
  }
 }
}

Try it (unpaid: shows the 402)

curl -si -X POST 'https://mcp.whitemagic.dev/mcp' -H 'accept: application/json' -H 'content-type: application/json' --data '{}'

The catalog declares POST. A 402 answer carries the payment requirements in the JSON body and, for x402 v2, base64 in the PAYMENT-REQUIRED header. This page never sends a payment.

Paid checks (x402, USDC on Base)

GET https://bazaar.agentexchange.work/r/8fb47a1c98b4/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"8fb47a1c98b4"} places this resource at the top of the report and search pages for 30 days for $1.00, labelled. Unpaid requests answer 402 with the terms. Pricing.

Catalog references: PayAI listing status · agentic.market (CDP Bazaar front end) · this record as JSON · all resources on mcp.whitemagic.dev.