CAPI2 Agent Commerce Multi-Source Grounding

x402

CAPI2 Agent Commerce Multi-Source Grounding is a paid API for AI agents from capi2-agent-commerce.vandurmedries.workers.dev, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-13).

Fetches and extracts content from up to 3 URLs, returning tamper-evident text extracts with SHA-256 content hashes for verifiable multi-source grounding.

Price / call$0.015

Seller volume →—

Success—

StatusUnknown

How this service works

Programmable authority checks and tamper-evident receipts for autonomous agents, sold through sustainable x402 commerce.

Output

A JSON object containing the original query, an array of extracts where each entry includes the extracted text snippet, the final resolved URL after any redirects, and a SHA-256 hash of the content for tamper-evidence, plus a count of how many sources were successfully checked.

Example use cases

Compliance audit trail for agent research

“I need you to pull content from https://sec.gov/rule1, https://sec.gov/rule2, and https://finra.org/guidance on the query 'margin requirements', max 3000 chars each, and return SHA-256 hashes for each source so our compliance team can verify the extracts are unchanged.”

Grounding chatbot answers in verified sources

“Before my agent answers the user's question about 'COVID vaccine eligibility', fetch content from https://cdc.gov/vaccines, https://who.int/vaccines, and https://nih.gov/covid — limit 2000 chars per source — and return the hashed extracts so the answer is grounded in verifiable evidence.”

Competitive intelligence with tamper-evident snapshots

“Grab up to 4000 characters each from https://competitorA.com/pricing, https://competitorB.com/pricing, and https://competitorC.com/pricing on the query 'enterprise pricing tiers', and give me the content with SHA-256 hashes so I can prove what the pages said today.”

Technical details

Endpoint

POSThttps://capi2-agent-commerce.vandurmedries.workers.dev/v1/multi-source-grounding

When to prefer

Choose this endpoint when your agent needs cryptographically verifiable, tamper-evident text extracts from multiple web sources simultaneously — especially for compliance, audit trails, or grounded reasoning where you need to prove what a page said at a point in time. Prefer it over generic web scrapers when SHA-256 content integrity is required. Best for 1–3 targeted URLs rather than broad crawls.

Side effects

URL is unreachable or returns non-200 status — that source is skipped or returns an error entry
query string too short (under 3 chars) or too long (over 300 chars) — 400 validation error
more than 3 source URLs provided — 400 validation error
max_chars_per_source outside 500–5000 range — 400 validation error
Payment not provided or insufficient — 402 Payment Required
Source URL returns non-text content (e.g. PDF, binary) — extract may be empty or malformed

Input

Schema · Request body

Field	Type	Description
query	string
source_urls	array
max_chars_per_source	integer

Output

Schema · Response

{
  "type": "json",
  "example": {
    "query": "security controls",
    "extracts": [
      {
        "text": "...",
        "final_url": "https://example.com/security",
        "content_sha256": "..."
      }
    ],
    "sources_checked": 1
  }
}

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How this service works

Programmable authority checks and tamper-evident receipts for autonomous agents, sold through sustainable x402 commerce.

Output

Example use cases

Compliance audit trail for agent research

Grounding chatbot answers in verified sources

Competitive intelligence with tamper-evident snapshots

Technical details

Endpoint

POSThttps://capi2-agent-commerce.vandurmedries.workers.dev/v1/multi-source-grounding

When to prefer

Side effects

URL is unreachable or returns non-200 status — that source is skipped or returns an error entry
query string too short (under 3 chars) or too long (over 300 chars) — 400 validation error
more than 3 source URLs provided — 400 validation error
max_chars_per_source outside 500–5000 range — 400 validation error
Payment not provided or insufficient — 402 Payment Required
Source URL returns non-text content (e.g. PDF, binary) — extract may be empty or malformed

Input

Schema · Request body

Field	Type	Description
query	string
source_urls	array
max_chars_per_source	integer

Output

Schema · Response

{
  "type": "json",
  "example": {
    "query": "security controls",
    "extracts": [
      {
        "text": "...",
        "final_url": "https://example.com/security",
        "content_sha256": "..."
      }
    ],
    "sources_checked": 1
  }
}