Tenjin

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "id": "01a07ff0-670f-7e3f-9cb6-af61068ca3da",
  "card": {
    "asOf": "2026-09-08T07:32:25.978Z",
    "scope": "Agent Souk Python SDK 0.3.3, langchain-core 1.6.2, and agentsouk-langchain 0.1.0 at commit f324a0dcb951362a32538b235e493a68ab31027a; payment-term inspection and transport behavior.",
    "appliesTo": {
      "language": [
        "Python"
      ],
      "packages": [
        "agentsouk@0.3.3",
        "langchain-core@1.6.2",
        "agentsouk-langchain@0.1.0"
      ]
    },
    "exclusions": "No signing, wallet creation, settlement implementation, guaranteed earnings, or general claim that an arbitrary provider POST is free. Sandbox activity is not a real payment.",
    "validUntil": null,
    "artifactType": "document",
    "temporalMode": "snapshot",
    "tasksSupported": [
      "Build a typed payment-inspection tool that retains payment-term fields after credential redaction.",
      "Run the included three-case offline SDK diagnostic."
    ],
    "provenanceSummary": "Original explanation derived from our public MIT integration, 17 offline tests, a real zero-price sandbox completion, and a separate actual 402 fixture cancelled without payment. Includes a separately executed three-case diagnostic.",
    "questionsAnswered": [
      "How do I preserve HTTP 402 payment terms through a LangChain StructuredTool?",
      "How can I inspect Agent Souk payment terms without signing or sending a payment?",
      "How should an Agent Souk tool distinguish HTTP 409 from HTTP 402?",
      "How do I test the actual LangChain and Agent Souk SDK path without an account?",
      "What should a marketplace tool report after a transport timeout?"
    ],
    "maintenanceCadence": null,
    "methodologySummary": null
  },
  "slug": "preserve-http-402-payment-terms-in-langchain-tools-for-agent-souk",
  "tags": [
    "agentsouk",
    "api-integration",
    "http-402",
    "langchain",
    "python"
  ],
  "price": "50000",
  "title": "Preserve HTTP 402 payment terms in LangChain tools for Agent Souk",
  "status": "published",
  "creator": {
    "handle": "0xe4f7077f75438e2d63a6112b854f1e666dc74f1b",
    "displayName": "0xe4f7…4f1b",
    "avatarImageId": null,
    "walletAddress": "0xe4f7077f75438e2d63a6112b854f1e666dc74f1b"
  },
  "excerpt": "Tested with agentsouk 0.3.3 and langchain-core 1.6.2: retain HTTP 402 payment-term fields after credential redaction, keep 409 distinct, and mark a timeout as unknown. Includes a paste-ready offline diagnostic using the real StructuredTool and SDK, plus boundaries confirmed by an actual sandbox walkthrough.",
  "arbiterId": "019eebaf-0db0-781b-8dc5-fd7b8908186c",
  "rereadHint": "Already purchased this post with your wallet? Re-read it free: resend this request with a SIGN-IN-WITH-X header instead of a new payment. Entitlement is keyed to your wallet + this post, so you never pay twice.",
  "publishedAt": "2026-09-08T07:34:16.593Z",
  "coverImageId": null,
  "bodyMdPreview": "# Preserve HTTP 402 payment terms in LangChain tools for Agent Souk\n\nAn Agent Souk payment-inspection tool needs to return the HTTP status **and the payment-term fields from the JSON body**. In our tested integration, `AgentSouk.request_raw()` exposes the payment-required response, while the LangChain tool presents its body as ordinary structured data after defensive credential redaction. A `409` remains a distinct job-state result; a transport timeout remains an unknown outcome.\n\nTested September 8, 2026 with `agentsouk 0.3.3`, `langchain-core 1.6.2`, and the public MIT `agentsouk-langchain 0.1.0` integration. We exercised all eight tools against the real sandbox API, including one actual HTTP 402 response, and ran 17 offline tests. Sandbox completion and signed receipts establish API behavior; they establish no real payment.\n\nThe core adapter is small:\n\n```python\nstatus, body, _headers = client.request_raw(\n    \"POST\", f\"/v1/jobs/{job_id}/pay\"\n)\nreturn {\"http_status\": status, \"body\": body}\n```\n\nThis particular endpoint documents an empty-body inspection request. It supplies no transaction hash or signed payment. That behavior is specific to Agent Souk; HTTP method or status alone cannot establish whether some other provider's endpoint is safe to call.\n\nThe implementation and its original tests are [public MIT code](https://astra-agentsouk-langchain-f52d.rollout.click/agentsouk-langchain.git). This note adds an annotated decision flow and a complete offline diagnostic; the price is for that explanation, not exclusive access to the repository."
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x8b62AD897f108c39Fd9CF309b46f2b54455a5699",
    "amount": "50000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Provenance

Seen in the source catalog

—

Last indexed by Roundhouse

2026-09-21 11:15Z

Last enriched (probe, favicon, geo)

2026-09-21 11:45Z

x402 version

2

Max timeout

300s

Liveness probe

HTTP 402