Horizon Pulse
Verified brief (schema brief-verified/1), on-chain live values and x402 spec facts only: answer plus 2-8 claims, each with an evidence array (verbatim quote, URL, retrieval time, body hash, offset; or chain, block and block time for on-chain reads). Charged only if >=2 claims are confirmed (2 publishers, 2 nodes, or 2 x402 spec documents) and every quote verifies; otherwise unpaid. Contract: horizonpulse.dev/contracts/brief-verified. Not advice. No personal data in q.
SearchLiveeip155:8453Exactvia cdp
ResearchVerified-briefx402Gas-feesUsdc
Calls · 30d
5
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 6 snapshots so far.
$60.19
Verified settled volume
263 settlements proven x402 by their on-chain EIP-3009 marker.
$1.00
Listed price
As published in the catalog. Always read the live 402 before paying.
5
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-24 14:42Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x5b32c973596078a967562ca652761404f19be0e9The 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.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x5b32c973596078a967562ca652761404f19be0e9",
"amount": "1000000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://horizonpulse.dev/api/research/report/brief",
"tags": [
"research",
"verified-brief",
"x402",
"gas-fees",
"usdc",
"base",
"ethereum"
],
"terms": "https://horizonpulse.dev/premium-terms",
"iconUrl": "https://horizonpulse.dev/icon.png",
"mimeType": "application/json",
"description": "Verified brief (schema brief-verified/1), on-chain live values and x402 spec facts only: answer plus 2-8 claims, each with an evidence array (verbatim quote, URL, retrieval time, body hash, offset; or chain, block and block time for on-chain reads). Charged only if >=2 claims are confirmed (2 publishers, 2 nodes, or 2 x402 spec documents) and every quote verifies; otherwise unpaid. Contract: horizonpulse.dev/contracts/brief-verified. Not advice. No personal data in q.",
"serviceName": "Horizon Pulse"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": "How much USDC is in circulation"
}
},
"output": {
"type": "json",
"example": {
"answer": "USDC totalSupply() read on-chain: 47,835,740,440 USDC on Ethereum (block 26231180, 2026-10-20T03:42:59Z) and 4,267,723,904 USDC on Base (block 52839227, 2026-10-20T03:43:21Z). Other chains are not included.",
"claims": [
{
"text": "USDC totalSupply() on Ethereum was 47,835,740,440 USDC at block 26231180 (2026-10-20T03:42:59Z).",
"tier": "onchain-confirmed",
"match": {
"date": "2026-10-20",
"unit": "USDC",
"topic": "totalSupply()",
"value": "47,835,740,440"
},
"status": "confirmed",
"onchain": {
"unit": "USDC",
"block": 26231180,
"chain": "ethereum",
"nodes": [
"ethereum.publicnode.com",
"eth.drpc.org"
],
"value": "47,835,740,440",
"observed_at": "2026-10-20T03:42:59Z"
},
"primary": null,
"evidence": [
{
"kind": "onchain",
"node": "ethereum.publicnode.com",
"unit": "USDC",
"block": 26231180,
"chain": "ethereum",
"value": "47,835,740,440",
"method": "totalSupply()",
"contract": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
"retrieved_at": "2026-10-20T03:43:25.430Z",
"block_timestamp": "2026-10-20T03:42:59Z"
},
{
"kind": "onchain",
"node": "eth.drpc.org",
"unit": "USDC",
"block": 26231180,
"chain": "ethereum",
"value": "47,835,740,440",
"method": "totalSupply()",
"contract": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
"retrieved_at": "2026-10-20T03:43:25.430Z",
"block_timestamp": "2026-10-20T03:42:59Z"
}
],
"secondary": null
}
],
"counts": {
"confirmed": 2,
"consistent": 0,
"unconfirmed": 0
},
"status": "pass",
"question": "How much USDC is in circulation",
"answer_by": "template"
}
}
},
"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"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"q"
],
"properties": {
"q": {
"type": "string",
"description": "Question (required). Accepted: Base or Ethereum gas (on-chain read), USDC supply on Ethereum and Base (on-chain totalSupply), or an x402 spec fact. Anything else is refused with 422 before payment. No personal data."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"description": "Verified brief (schema brief-verified/1): answer plus 2-8 claims, each with an evidence array. Charged only if at least 2 claims are confirmed in two independent sources as defined at /contracts/brief-verified; otherwise 422, unpaid. The example is a trimmed real passing brief recorded at 2026-10-20T03:43:25Z (GET /api/demo/brief-verified); live values differ on every call. Claims per question type: Base gas and Ethereum gas, 2 (base fee and gas limit, each read from two independent nodes); USDC supply, 2 (totalSupply() on Ethereum and on Base, each from two independent nodes); x402 spec facts, 2-8 (each in two separate specification documents). Optional type=base_gas|eth_gas|usdc_supply|x402_spec skips phrase matching."
}
}
}
}
}
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
1USDC≈ $1 USD
on Base · exact scheme
Pay 1 USDC on Base to 0x5b32…be0e9. The signed payment is good for 5 minutes.
- Paid to
- 0x5b32…be0e9
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 1000000 smallest units
902350units
on Base · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0x5b32…be0e9
- Token contract
- 0x60a3…adb42
- Payment window
- 5 minutes
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x5b32c973596078a967562ca652761404f19be0e9",
"amount": "1000000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
},
{
"asset": "0x60a3e35cc302bfa44cb288bc5a4f316fdb1adb42",
"extra": {
"name": "EURC",
"buffer": "1.01",
"pricing": "EURC amount = ceil(USD price / eurUsdRate * buffer), 6 decimals; fixed rate, no live FX",
"version": "2",
"rateDate": "2026-10-23",
"eurUsdRate": "1.1193",
"rateSource": "ECB euro reference rate"
},
"payTo": "0x5b32c973596078a967562ca652761404f19be0e9",
"amount": "902350",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": "How much USDC is in circulation"
}
},
"output": {
"type": "json",
"example": {
"answer": "USDC totalSupply() read on-chain: 47,835,740,440 USDC on Ethereum (block 26231180, 2026-10-20T03:42:59Z) and 4,267,723,904 USDC on Base (block 52839227, 2026-10-20T03:43:21Z). Other chains are not included.",
"claims": [
{
"text": "USDC totalSupply() on Ethereum was 47,835,740,440 USDC at block 26231180 (2026-10-20T03:42:59Z).",
"tier": "onchain-confirmed",
"match": {
"date": "2026-10-20",
"unit": "USDC",
"topic": "totalSupply()",
"value": "47,835,740,440"
},
"status": "confirmed",
"onchain": {
"unit": "USDC",
"block": 26231180,
"chain": "ethereum",
"nodes": [
"ethereum.publicnode.com",
"eth.drpc.org"
],
"value": "47,835,740,440",
"observed_at": "2026-10-20T03:42:59Z"
},
"primary": null,
"evidence": [
{
"kind": "onchain",
"node": "ethereum.publicnode.com",
"unit": "USDC",
"block": 26231180,
"chain": "ethereum",
"value": "47,835,740,440",
"method": "totalSupply()",
"contract": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
"retrieved_at": "2026-10-20T03:43:25.430Z",
"block_timestamp": "2026-10-20T03:42:59Z"
},
{
"kind": "onchain",
"node": "eth.drpc.org",
"unit": "USDC",
"block": 26231180,
"chain": "ethereum",
"value": "47,835,740,440",
"method": "totalSupply()",
"contract": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
"retrieved_at": "2026-10-20T03:43:25.430Z",
"block_timestamp": "2026-10-20T03:42:59Z"
}
],
"secondary": null
}
],
"counts": {
"confirmed": 2,
"consistent": 0,
"unconfirmed": 0
},
"status": "pass",
"question": "How much USDC is in circulation",
"answer_by": "template"
}
}
},
"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"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"q"
],
"properties": {
"q": {
"type": "string",
"description": "Question (required). Accepted: Base or Ethereum gas (on-chain read), USDC supply on Ethereum and Base (on-chain totalSupply), or an x402 spec fact. Anything else is refused with 422 before payment. No personal data."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"description": "Verified brief (schema brief-verified/1): answer plus 2-8 claims, each with an evidence array. Charged only if at least 2 claims are confirmed in two independent sources as defined at /contracts/brief-verified; otherwise 422, unpaid. The example is a trimmed real passing brief recorded at 2026-10-20T03:43:25Z (GET /api/demo/brief-verified); live values differ on every call. Claims per question type: Base gas and Ethereum gas, 2 (base fee and gas limit, each read from two independent nodes); USDC supply, 2 (totalSupply() on Ethereum and on Base, each from two independent nodes); x402 spec facts, 2-8 (each in two separate specification documents). Optional type=base_gas|eth_gas|usdc_supply|x402_spec skips phrase matching."
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-24 14:42Z
- Last indexed by Roundhouse
- 2026-10-26 20:00Z
- Last enriched (probe, favicon, geo)
- 2026-10-20 16:15Z
- 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. 6 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 Horizon Pulse 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=Horizon%20Pulse' 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://horizonpulse.dev/api/research/report/brief, 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.