Open Source Filings
OSF is a live marketplace of provenance stamped public domain government and scientific data, built for autonomous agents that pay per record over x402 micropayments on Base. A paid MCP server in the official MCP Registry, discoverable on the Coinbase CDP Bazaar.
The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
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.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"note": "x402 v2 clients: the canonical quote is the PAYMENT-REQUIRED response header (base64 JSON envelope). This body is a v1 compatibility rendering of the same quote.",
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x72f62dE8b70d6CFa8Cc2dF6f21F243f289F3396c",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://api.osf-master-server.com/x402/sample/:record_id",
"description": "Sample any single record in the OSF catalog for $0.001: the full JSON payload plus a provenance URL to the authoritative primary source. A low cost way for an autonomous agent to try the data before buying at the standard per record or search price. One verified record per call keyed by record_id from the free catalog, across 80 sources of US government and scientific data. Fair use daily cap per wallet.",
"maxAmountRequired": "1000",
"maxTimeoutSeconds": 300
}
],
"x402Version": 1
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
Pay 0.001 USDC on Base to 0x72f6…3396c. The signed payment is good for 5 minutes.
- Paid to
- 0x72f6…3396c
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 1000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x72f62dE8b70d6CFa8Cc2dF6f21F243f289F3396c",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"pathParams": {
"record_id": ":record_id"
},
"queryParams": {
"format": "json"
}
},
"output": {
"type": "json",
"example": {
"data": {
"data_type": "...",
"record_key": "SRC:ID"
},
"source": "CISA_KEV",
"status": "success",
"data_type": "CISA Known Exploited Vulnerability",
"record_id": 12345,
"provenance_url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
}
}
},
"schema": {
"type": "object",
"$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"
},
"pathParams": {
"type": "object"
},
"queryParams": {
"type": "object",
"required": [
"format"
],
"properties": {
"format": {
"type": "string",
"description": "Response format (json)."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"status",
"record_id",
"data",
"provenance_url"
],
"properties": {
"data": {
"type": "object"
},
"source": {
"type": "string"
},
"status": {
"type": "string"
},
"data_type": {
"type": "string"
},
"record_id": {
"type": "integer"
},
"provenance_url": {
"type": "string"
}
}
}
}
}
}
},
"routeTemplate": "/x402/sample/:record_id"
}
}Provenance
- Seen in the source catalog
- 2026-08-26 06:17Z
- Last indexed by Roundhouse
- 2026-09-25 06:10Z
- Last enriched (probe, favicon, geo)
- 2026-09-12 07:15Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 0
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
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Open Source Filings 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=Open%20Source%20Filings' 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://api.osf-master-server.com/x402/sample/:record_id, 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. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.