api.signalfuse.co
11 MCP tools for autonomous trading agents. Real-time signals, sentiment, macro regime, web search, code execution. Pay per call with USDC on Base — no API keys needed.
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.
{
"error": "Payment required",
"price": "$0.008",
"endpoint": "/v1/gateway/search/brave",
"how_to_pay": {
"option_1": {
"docs": "https://api.signalfuse.co/.well-known/x402",
"method": "x402 micropayment",
"protocol": "Attach USDC payment on Base (eip155:8453) per x402 spec"
},
"option_2": {
"method": "Credit token",
"step_1": "POST https://api.signalfuse.co/v1/credits/trial with {\"wallet\": \"0x...\"} (5 free credits)",
"step_2": "Add header: x-credit-token: <token from step 1>",
"step_3": "Retry this request"
},
"option_3": {
"url": "https://signalfuse.co/play",
"method": "Browser playground (no setup)",
"description": "Try every paid endpoint from your browser. 25 free calls per day, no wallet, no signup."
}
},
"playground_url": "https://signalfuse.co/play",
"sample_response": {
"count": "[paid]",
"results": [
{
"url": "https://example.com",
"title": "Sample headline",
"description": "[paid]"
}
]
},
"free_alternatives": {
"/v1/health": "Service status — free",
"/v1/regime/preview": "Regime + confidence (no reasoning) — free",
"/v1/arena/leaderboard": "Strategy performance — free"
}
}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 0.008 USDC on Base to 0xf080…Be035. The signed payment is good for 5 minutes.
- Paid to
- 0xf080…Be035
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 8000 smallest units
- Buys
- Web search via Brave Search API
- Returns
- application/json
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xf080a1Aab08650946acDa41410a7eDC14f7Be035",
"amount": "8000",
"scheme": "exact",
"network": "eip155:8453",
"mimeType": "application/json",
"resource": "https://api.signalfuse.co/v1/gateway/search/brave",
"description": "Web search via Brave Search API",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": {
"type": "string",
"required": true,
"description": "Search query"
},
"count": {
"type": "integer",
"default": 10,
"description": "Number of results (max 20)"
}
}
},
"output": {
"type": "json",
"example": {
"web": {
"results": [
{
"url": "https://example.com",
"title": "Bitcoin Price...",
"description": "..."
}
]
}
}
}
},
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": {
"type": "string",
"required": true,
"description": "Search query"
},
"count": {
"type": "integer",
"default": 10,
"description": "Number of results (max 20)"
}
}
},
"output": {
"type": "json",
"example": {
"web": {
"results": [
{
"url": "https://example.com",
"title": "Bitcoin Price...",
"description": "..."
}
]
}
}
}
},
"schema": {
"output": {
"required": [
"web"
],
"properties": {
"web": {
"type": "object",
"properties": {
"results": {
"type": "array",
"items": {
"type": "object",
"properties": {
"url": {
"type": "string",
"format": "uri"
},
"title": {
"type": "string"
},
"description": {
"type": "string"
}
}
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-21 22:56Z
- Last indexed by Roundhouse
- 2026-09-24 10:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-21 06:45Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 402
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 api.signalfuse.co 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.signalfuse.co' 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.signalfuse.co/v1/gateway/search/brave, 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.