Accelerometer
Use this when the question is what moved in AI progress between two dates: the acceleration between two readings of 129 series (benchmarks, compute, AGI odds, model pricing, AI stocks and crypto, energy, space, robotics, research output). Per series: from/to value and date, absolute and % change, and whether a new observation landed. Dates are YYYY-MM-DD ids from the free menu at /.
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.
{
"how": "Pick two ids from GET / (free), then retry GET /ai-progress/what-changed/<from>/<to> with an x402 `payment` header.",
"menu": "https://x402-accelerometer-feed.fly.dev/",
"error": "payment_required",
"price": "$0.01",
"health": "https://x402-accelerometer-feed.fly.dev/health",
"preview": "https://x402-accelerometer-feed.fly.dev/preview",
"networks": [
"eip155:8453",
"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
]
}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 0.01 USDC on Base to 0xbC3A…713C4. The signed payment is good for 5 minutes.
- Paid to
- 0xbC3A…713C4
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 10000 smallest units
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
- 5dBE1v…F9cc4
- Token contract
- EPjFWd…TDt1v
- Payment window
- 5 minutes
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xbC3A8eAc0601F717E803935cABEDeE8EDB7713C4",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP"
},
"payTo": "5dBE1vqMVJCbxpBv9kw9nQJguUhYXk5mRGVfsxEF9cc4",
"amount": "10000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"pathParams": {
"to": ":to",
"from": ":from"
},
"queryParams": {}
},
"output": {
"type": "json",
"example": {
"to": {
"run_at": "2026-09-16T12:25:28.530204+00:00",
"snapshot_id": "2026-09-16"
},
"from": {
"run_at": "2026-07-12T14:00:05.754191+00:00",
"snapshot_id": "2026-07-12"
},
"kind": "delta",
"n_moved": 76,
"sources": [
{
"id": "agents.x402_services_count",
"to": {
"date": "2026-09-16",
"value": 2865
},
"from": {
"date": "2026-07-12",
"value": 1779
},
"unit": "count",
"domain": "agents",
"metric": "x402 pay-per-request services (agentic.market)",
"delta_abs": 1086,
"delta_pct": 61.0455,
"new_observation": true
},
{
"id": "autonomy.metr_time_horizon_50",
"to": {
"date": "2025-04-16",
"value": 112.230447
},
"from": {
"date": "2025-04-16",
"value": 112.230447
},
"unit": "minutes",
"domain": "autonomy",
"metric": "METR frontier task-completion horizon @50% (minutes)",
"delta_abs": 0,
"delta_pct": 0,
"new_observation": false
}
],
"composite": null,
"n_sources": 129,
"schema_version": "0.2"
}
}
},
"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"
},
"pathParams": {
"type": "object",
"required": [
"from",
"to"
],
"properties": {
"to": {
"type": "string",
"description": "later reading id"
},
"from": {
"type": "string",
"description": "earlier reading id"
}
}
},
"queryParams": {
"type": "object",
"properties": {}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"kind",
"from",
"to",
"sources"
],
"properties": {
"to": {
"type": "object"
},
"from": {
"type": "object"
},
"kind": {
"type": "string",
"const": "delta"
},
"n_moved": {
"type": "integer",
"description": "sources with a newer observation in `to`"
},
"sources": {
"type": "array",
"items": {
"type": "object",
"properties": {
"id": {
"type": "string"
},
"to": {
"type": "object"
},
"from": {
"type": [
"object",
"null"
]
},
"unit": {
"type": "string"
},
"domain": {
"type": "string"
},
"metric": {
"type": "string"
},
"delta_abs": {
"type": [
"number",
"null"
]
},
"delta_pct": {
"type": [
"number",
"null"
]
},
"new_observation": {
"type": "boolean"
}
}
}
},
"composite": {
"type": "null"
},
"n_sources": {
"type": "integer"
}
}
}
}
}
}
},
"routeTemplate": "/ai-progress/what-changed/:from/:to"
}
}Provenance
- Seen in the source catalog
- 2026-09-17 09:47Z
- Last indexed by Roundhouse
- 2026-09-24 13:40Z
- Last enriched (probe, favicon, geo)
- 2026-09-17 18:15Z
- 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. 7 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 Accelerometer 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=Accelerometer' 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-accelerometer-feed.fly.dev/ai-progress/what-changed/:from/:to, 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.