api.axiomworks.co.uk
Use this for cheap research search over open sources: Wikipedia + OpenAlex (250M scholarly works) + arXiv + Crossref, merged, deduplicated (DOI/title) and ranked, with snippets, authors, dates, DOIs and citation counts. Not a general web index. Example: {q:"x402 agent payments"}. $0.003.
SearchLiveeip155:8453Exactvia cdp
Calls · 30d
3
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far.
$4.05
Verified settled volume
115 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0030
Listed price
As published in the catalog. Always read the live 402 before paying.
3
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-11-05 15:38Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x88b1c747c33A5868A34057D8C57318E5602b3ff6The 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.
{
"error": "X-PAYMENT header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x88b1c747c33A5868A34057D8C57318E5602b3ff6",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://api.axiomworks.co.uk/search",
"description": "Use this for cheap research search over open sources: Wikipedia + OpenAlex (250M scholarly works) + arXiv + Crossref, merged, deduplicated (DOI/title) and ranked, with snippets, authors, dates, DOIs and citation counts. Not a general web index. Example: {q:\"x402 agent payments\"}. $0.003.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": {
"type": "string",
"description": "Search query (2-300 chars)"
},
"lang": {
"type": "string",
"description": "Wikipedia language code, default en"
},
"limit": {
"type": "string",
"description": "Max results 1-30 (default 15)"
},
"sources": {
"type": "string",
"description": "Optional comma list: wikipedia,openalex,arxiv,crossref (default all)"
}
},
"discoverable": true
},
"output": {
"schema": {
"type": "object",
"properties": {
"count": {
"type": "integer"
},
"query": {
"type": "string"
},
"results": {
"type": "array",
"items": {
"type": "object",
"properties": {
"doi": {
"type": [
"string",
"null"
]
},
"url": {
"type": "string"
},
"date": {
"type": [
"string",
"null"
]
},
"type": {
"type": "string"
},
"score": {
"type": "number"
},
"title": {
"type": "string"
},
"source": {
"type": "string"
},
"snippet": {
"type": "string"
}
}
}
},
"sources": {
"type": "object"
}
}
},
"example": {
"count": 13,
"query": "x402 agent payments",
"results": [
{
"doi": null,
"url": "http://arxiv.org/abs/2605.11781v1",
"date": "2026-05-12",
"type": "preprint",
"score": 0.85,
"title": "Five Attacks on x402 Agentic Payment Protocol",
"source": "arxiv",
"also_in": [],
"authors": [
"Zelin Li",
"Qin Wang"
],
"snippet": "The x402 protocol revives the HTTP 402 Payment Required status code to enable web-native micropayments across APIs, content, and agents. It combines synchronous"
},
{
"doi": null,
"url": "http://arxiv.org/abs/2604.11430v2",
"date": "2026-04-13",
"type": "preprint",
"score": 0.85,
"title": "Hardening x402: PII-Safe Agentic Payments via Pre-Execution Metadata Filtering",
"source": "arxiv",
"also_in": [],
"authors": [
"Vladimir Stantchev"
],
"snippet": "AI agents that pay for resources via the x402 protocol embed payment metadata - resource URLs, descriptions, and reason strings - in every HTTP payment request."
}
],
"sources": {
"arxiv": {
"ok": true,
"count": 6
},
"crossref": {
"ok": true,
"count": 6
},
"openalex": {
"ok": false,
"error": "openalex 429"
},
"wikipedia": {
"ok": true,
"count": 1
}
},
"deduped_from": 13
}
}
},
"maxAmountRequired": "3000",
"maxTimeoutSeconds": 120
}
],
"x402_v2": "see PAYMENT-REQUIRED header (base64 JSON)",
"x402Version": 1,
"example_call": "https://api.axiomworks.co.uk/search?q=x402+agent+payments",
"free_preview": "https://api.axiomworks.co.uk/search?q=x402+agent+payments&preview=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.
0.003USDC≈ $0.003 USD
on Base · exact scheme
Pay 0.003 USDC on Base to 0x88b1…b3ff6. The signed payment is good for 2 minutes.
- Paid to
- 0x88b1…b3ff6
- USD Coin contract
- 0x8335…02913
- Payment window
- 2 minutes
- As published
- 3000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x88b1c747c33A5868A34057D8C57318E5602b3ff6",
"amount": "3000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 120
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": "x402 agent payments"
}
},
"output": {
"type": "json",
"example": {
"count": 13,
"query": "x402 agent payments",
"results": [
{
"doi": null,
"url": "http://arxiv.org/abs/2605.11781v1",
"date": "2026-05-12",
"type": "preprint",
"score": 0.85,
"title": "Five Attacks on x402 Agentic Payment Protocol",
"source": "arxiv",
"also_in": [],
"authors": [
"Zelin Li",
"Qin Wang"
],
"snippet": "The x402 protocol revives the HTTP 402 Payment Required status code to enable web-native micropayments across APIs, content, and agents. It combines synchronous"
},
{
"doi": null,
"url": "http://arxiv.org/abs/2604.11430v2",
"date": "2026-04-13",
"type": "preprint",
"score": 0.85,
"title": "Hardening x402: PII-Safe Agentic Payments via Pre-Execution Metadata Filtering",
"source": "arxiv",
"also_in": [],
"authors": [
"Vladimir Stantchev"
],
"snippet": "AI agents that pay for resources via the x402 protocol embed payment metadata - resource URLs, descriptions, and reason strings - in every HTTP payment request."
}
],
"sources": {
"arxiv": {
"ok": true,
"count": 6
},
"crossref": {
"ok": true,
"count": 6
},
"openalex": {
"ok": false,
"error": "openalex 429"
},
"wikipedia": {
"ok": true,
"count": 1
}
},
"deduped_from": 13
}
}
},
"schema": {
"type": "object",
"$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": "Search query (2-300 chars)"
},
"lang": {
"type": "string",
"description": "Wikipedia language code, default en"
},
"limit": {
"type": "string",
"description": "Max results 1-30 (default 15)"
},
"sources": {
"type": "string",
"description": "Optional comma list: wikipedia,openalex,arxiv,crossref (default all)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"count": {
"type": "integer"
},
"query": {
"type": "string"
},
"results": {
"type": "array",
"items": {
"type": "object",
"properties": {
"doi": {
"type": [
"string",
"null"
]
},
"url": {
"type": "string"
},
"date": {
"type": [
"string",
"null"
]
},
"type": {
"type": "string"
},
"score": {
"type": "number"
},
"title": {
"type": "string"
},
"source": {
"type": "string"
},
"snippet": {
"type": "string"
}
}
}
},
"sources": {
"type": "object"
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-11-05 15:38Z
- Last indexed by Roundhouse
- 2026-11-10 08:20Z
- Last enriched (probe, favicon, geo)
- 2026-11-06 06:45Z
- x402 version
- 2
- Max timeout
- 120s
- 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. 4 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.axiomworks.co.uk 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.axiomworks.co.uk' 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.axiomworks.co.uk/search, 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.