API Direct

Name: API Direct
Price: 0.004 USDC

Get an author's public activity feed: their Notes and the posts they publish or restack, newest first, or only their notes, posts, replies, restacks or likes.

DataUnknowneip155:8453Exactvia cdp

https://x402.apidirect.io/v1/substack/user/activity

Substack

Settlements · 30d

169

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.

$1.00

Verified settled volume

169 settlements proven x402 by their on-chain EIP-3009 marker.

$0.0040

Listed price

As published in the catalog. Always read the live 402 before paying.

Calls · 30d

Upstream's own call count for this endpoint, not ours.

Unique payers · 30d

Last called 2026-10-25 12:23Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0x5d07Cc2a0FB4Eb123A525CA0b51cf6fB485014fc

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Accepts

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

0.004USDC≈ $0.004 USD

on Base · exact scheme

Pay 0.004 USDC on Base to 0x5d07…014fc. The signed payment is good for 15 minutes.

Paid to: 0x5d07…014fc
USD Coin contract: 0x8335…02913
Payment window: 15 minutes
As published: 4000 smallest units

0.004USDC≈ $0.004 USD

on Base · upto scheme

Pay 0.004 USDC on Base to 0x5d07…014fc. The signed payment is good for 15 minutes.

Paid to: 0x5d07…014fc
USD Coin contract: 0x8335…02913
Payment window: 15 minutes
As published: 4000 smallest units

The catalog’s raw entry

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x5d07Cc2a0FB4Eb123A525CA0b51cf6fB485014fc",
    "amount": "4000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 900
  },
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "facilitatorAddress": "0x93F6601151cCB08F333AB4B1CCcfb1e188c0bE44",
      "assetTransferMethod": "permit2"
    },
    "payTo": "0x5d07Cc2a0FB4Eb123A525CA0b51cf6fB485014fc",
    "amount": "4000",
    "scheme": "upto",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 900
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "username": "hamish"
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET",
                "HEAD",
                "DELETE"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "required": [],
              "properties": {
                "url": {
                  "type": "string",
                  "maxLength": 500,
                  "description": "Profile URL, e.g. https://substack.com/@lenny (max 500 characters). Provide one of username, user_id or url."
                },
                "type": {
                  "enum": [
                    "note",
                    "post",
                    "reply",
                    "restack",
                    "like"
                  ],
                  "type": "string",
                  "description": "Only one kind of activity: note, post, reply, restack or like. Omit for notes, posts and restacks."
                },
                "pages": {
                  "type": "integer",
                  "default": 1,
                  "maximum": 250,
                  "minimum": 1,
                  "description": "Number of pages to fetch and merge into one response (1-250, billed per page returned). Each page returns 12 items. Fetching stops early when there are no more results."
                },
                "user_id": {
                  "type": "string",
                  "description": "Numeric Substack user ID, as returned in user_id. Provide one of username, user_id or url."
                },
                "username": {
                  "type": "string",
                  "maxLength": 100,
                  "description": "Substack handle, e.g. lenny, with or without a leading @ (max 100 characters). Provide one of username, user_id or url."
                }
              }
            }
          },
          "additionalProperties": false
        }
      }
    }
  },
  "eip2612GasSponsoring": {
    "info": {
      "version": "1",
      "description": "The facilitator accepts EIP-2612 gasless Permit to Permit2 canonical contract."
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "from",
        "asset",
        "spender",
        "amount",
        "nonce",
        "deadline",
        "signature",
        "version"
      ],
      "properties": {
        "from": {
          "type": "string",
          "pattern": "^0x[a-fA-F0-9]{40}$",
          "description": "The address of the sender."
        },
        "asset": {
          "type": "string",
          "pattern": "^0x[a-fA-F0-9]{40}$",
          "description": "The address of the ERC-20 token contract."
        },
        "nonce": {
          "type": "string",
          "pattern": "^[0-9]+$",
          "description": "The current EIP-2612 nonce of the sender."
        },
        "amount": {
          "type": "string",
          "pattern": "^[0-9]+$",
          "description": "The amount to approve (uint256)."
        },
        "spender": {
          "type": "string",
          "pattern": "^0x[a-fA-F0-9]{40}$",
          "description": "The address of the spender (Canonical Permit2)."
        },
        "version": {
          "type": "string",
          "pattern": "^[0-9]+(\\.[0-9]+)*$",
          "description": "Schema version identifier."
        },
        "deadline": {
          "type": "string",
          "pattern": "^[0-9]+$",
          "description": "The timestamp at which the signature expires."
        },
        "signature": {
          "type": "string",
          "pattern": "^0x[a-fA-F0-9]+$",
          "description": "The 65-byte concatenated signature (r, s, v) as a hex string."
        }
      }
    }
  }
}

Provenance

Seen in the source catalog: 2026-10-25 12:23Z
Last indexed by Roundhouse: 2026-10-26 18:50Z
Last enriched (probe, favicon, geo): —
x402 version: 2
Max timeout: 900s
Liveness probe: Not probed

Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md

Show the prompt

Using Roundhouse, look up the x402 service API Direct and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=API%20Direct'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://x402.apidirect.io/v1/substack/user/activity, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.