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561 Group Market: Reading Knowledge Join
x402
561 Group Market: Reading Knowledge Join is a paid API for AI agents from market.561.group, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).
Joins reading and knowledge records via a machine-payable HTTP 402 endpoint, returning structured JSON results paid per-request in USDC on Base.
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-payable x402 offers and books: software pays per request in USDC on Base over HTTP 402, with no account or API key.
Output
A structured JSON object containing the joined reading and knowledge record data. The exact schema is labeled 'contested' indicating dynamic or variable output structure depending on the input parameters provided.
Example use cases
Reading metadata knowledge enrichment
“Take my reading record ID and join it with the knowledge base to get back the enriched combined record — I need the full structured JSON with both reading and knowledge fields merged.”
Automated knowledge lookup per reading item
“For each reading item in my list, fetch the joined knowledge record from the 561 Group market endpoint and return the structured results, paying per call in USDC.”
Knowledge graph association retrieval
“I have a reading entry and I want to see what knowledge records are associated with it — can you pull the joined result from the 561 Group market and show me what comes back?”
Technical details
Endpoint
POSThttps://market.561.group/v1/four/reading-knowledge-join?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a per-request, accountless, keyless lookup that joins reading and knowledge records, and you are able to pay $0.001 USDC per call on Base via the x402 protocol. Prefer this over traditional API-key services when building autonomous agents that need frictionless micropayment-based access without credential management.
Side effects
- Payment failure: insufficient USDC balance on Base causes HTTP 402 rejection
- Invalid join parameters: malformed or missing input fields return an error
- No matching record: the reading or knowledge identifier does not exist, returning empty or null result
- Network timeout: Base network congestion delays payment confirmation
- Schema mismatch: response structure varies (contested schema) and may not match expected fields
Output
Schema · Response
{
"type": "json",
"example": "contested"
}Tags
x402
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