{
  "format": "delx/intent-card/v1",
  "id": "csv-join-by-key-api",
  "intent": "CSV Join By Key for an agent workflow",
  "title": "CSV Join By Key API for agents",
  "description": "CSV Join By Key: CSV Join By Key inner-joins two bounded CSV tables on one key column from bounded caller-supplied values without an external provider. Call CSV Join By Key before an agent hands structured data or a batch plan to a downstream tool with a stricter contract. Returns the bounded transformation or validation finding with counts, normalized values, and a versioned result contract for CSV Join By Key as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, memory-only execution with no paid upstream, live RPC, web search, credentials, custody, signing, media generator, or input retention. Honest limit: Processes bounded caller-supplied data in memory only; it performs no file fetch, database write, code execution, or retention. Advisory output only; the buyer owns authorization, payment policy, and production decisions.",
  "keywords": [
    "CSV Join By Key API",
    "CSV Join By Key for agents",
    "pay per result API",
    "x402 API",
    "no API key"
  ],
  "updated_at": "2026-08-23",
  "canonical_url": "https://commerce.delx.ai/intents/csv-join-by-key-api",
  "machine_url": "https://commerce.delx.ai/intents/csv-join-by-key-api.json",
  "recommendation": {
    "tool_name": "util_csv_join_by_key",
    "service_name": "CSV Join By Key",
    "method": "POST",
    "resource": "https://api.delx.ai/api/v1/x402/csv-join-by-key",
    "price_usdc": "0.001",
    "payment_protocols": [
      "x402",
      "mpp"
    ],
    "input_schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "left": {
          "type": "string",
          "maxLength": 8192,
          "description": "Left supplied to CSV Join By Key; used only for this bounded calculation and processed in memory without retention."
        },
        "right": {
          "type": "string",
          "maxLength": 8192,
          "description": "Right supplied to CSV Join By Key; used only for this bounded calculation and processed in memory without retention."
        },
        "key": {
          "type": "string",
          "maxLength": 8192,
          "description": "Key supplied to CSV Join By Key; used only for this bounded calculation and processed in memory without retention."
        }
      },
      "required": [
        "left",
        "right",
        "key"
      ],
      "additionalProperties": false
    },
    "example_input": {
      "left": "id,name\n1,Ada\n2,Lin",
      "right": "id,score\n1,10\n3,20",
      "key": "id"
    },
    "example_output": {
      "schema": "delx/util-csv-join-by-key/v1",
      "operation": "data_batch:csv_join_by_key",
      "status": "pass",
      "result": {
        "csv": "id,name,score\n1,Ada,10",
        "row_count": 1
      },
      "evidence": {
        "input_sha256": "57022525cee3a1a6a7c28356dba473bc310bef220434f10ff449553cbb91cf73",
        "retained": false,
        "external_calls": 0
      }
    },
    "agentcash": {
      "buy": "npx agentcash@latest fetch https://api.delx.ai/api/v1/x402/csv-join-by-key -m POST -H 'x-delx-source: intent-card-csv-join-by-key-api' --max-amount 0.001 -b '{\"left\":\"id,name\\n1,Ada\\n2,Lin\",\"right\":\"id,score\\n1,10\\n3,20\",\"key\":\"id\"}'",
      "max_amount_usdc": "0.001"
    }
  },
  "attribution": {
    "header": "x-delx-source",
    "value": "intent-card-csv-join-by-key-api"
  },
  "evidence": {
    "paid_openapi": "https://api.delx.ai/openapi.x402.json",
    "governed_portfolio": "https://api.delx.ai/x402-portfolio.json",
    "live_contract": "https://api.delx.ai/api/v1/x402/csv-join-by-key"
  }
}