verified until 2026-08-19
Volatility-adjusted cross-sectional momentum rankings for the top-50 crypto assets and 40 US equities/sector ETFs. Multi-horizon blended returns divided by annualised volatility, ranked cross-sectionally with long/short quintile flags. Pay 0.05 USDC on Base and the transaction hash IS your API key - no signup or account needed, which is what an autonomous buyer requires. Free previews at /v1/crypto/preview and /v1/preview. Also exposes an MCP server at /mcp and an A2A agent card.
Pay from $0.05 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.
listed 2026-08-12 · no on-chain settlement recorded yet
ASSESSMENT
updated 2h agoEvidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.
reliability 100%
- uptime 24h
- 100%
- uptime 7d
- 100%
- uptime 30d
- 100%
- uptime 90d
- 100%
- response p95
- 296ms
- avg response
- 296ms
- total checks
- 1
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
compliance C (12/14): declares the current x402 version (2), EIP-712 domain parameters present on every EVM entry
12 of 14 x402 conformance checks pass; failing: declares the current x402 version (2), EIP-712 domain parameters present on every EVM entry. Full checklist below.
signability route not signable
At least one EVM route on this service returns its 402 without the EIP-712 domain parameters (extra.name and extra.version), so a standard x402 client cannot build the signature for that route.
Measured on the last 402 envelope captured from this service. It is a fact about the envelope, not a judgement on the service or its operator.
This is the only conformance check that caps the compliance grade, at C.
price $0.05 (p84 in Data)
- price (min)
- $0.05
- category percentile (min)
- p84 in Data
- endpoints / prices
- 2 / 1
- model
- flat
- stability
- 100%
risk clean
No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.
- domain age
- 24d
- registrar
- GoDaddy.com, LLC
- hosting
- custom
- domain created
- 2026-07-19
Identity facts, not a risk score.
traction $0.00 30d · 0 buyers
- volume 30d
- $0.00
- buyers 30d
- 0
- settlements 30d
- 0
- first settlement
- ---
- last settlement
- ---
- top buyer share
- -
- trend 7d vs 30d
- -
- networks
- eip155:8453
- volume all-time
- $0
- settlements all-time
- 0
- median settlement 30d
- -
- max settlement 30d
- -
- settled via
- -
Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.
Top buyer share is a concentration signal, not part of the ranking score.
WHAT IT DOES
ai-derivedNo AI synthesis has been produced for this service yet.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET | 402 CHANNEL |
|---|---|---|---|---|---|---|
| GET | /v1/crypto | 0.05 USDC on Base buys 25 calls. | $0.05 | Base | USDC | body (v1 style) |
| GET | /v1/momentum | 0.05 USDC on Base buys 25 calls. | $0.05 | Base | USDC | body (v1 style) |
REQUEST / RESPONSE EXAMPLE
An unpaid request to GET /v1/crypto returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i 'https://smeltworks.com/momentumsignals/v1/crypto'
// 402 response (captured by monitor) · 2 payloads · click to expand
[
{
"error": "payment required",
"accepts": [
{
"asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"payTo": "0x298830dcC5844867Ba011bceEa3DB2E37104EeD0",
"scheme": "exact",
"chainId": 8453,
"network": "base",
"mimeType": "application/json",
"resource": "http://smeltworks.com/momentumsignals/v1/crypto",
"amountUsdc": 0.05,
"assetSymbol": "USDC",
"description": "0.05 USDC on Base buys 25 calls.",
"maxAmountRequired": "50000"
}
],
"howToPay": [
"1. Send at least 0.05 USDC (Base, chainId 8453) to 0x298830dcC5844867Ba011bceEa3DB2E37104EeD0.",
"2. Retry this request with header 'X-PAYMENT-TX: <your tx hash>'.",
"3. That hash is your API key for 25 calls. Reuse it until spent.",
"Payment is verified on-chain by this server. No signup, no key, no account."
],
"x402Version": 1
},
{
"error": "payment required",
"accepts": [
{
"asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"payTo": "0x298830dcC5844867Ba011bceEa3DB2E37104EeD0",
"scheme": "exact",
"chainId": 8453,
"network": "base",
"mimeType": "application/json",
"resource": "http://smeltworks.com/momentumsignals/v1/momentum",
"amountUsdc": 0.05,
"assetSymbol": "USDC",
"description": "0.05 USDC on Base buys 25 calls.",
"maxAmountRequired": "50000"
}
],
"howToPay": [
"1. Send at least 0.05 USDC (Base, chainId 8453) to 0x298830dcC5844867Ba011bceEa3DB2E37104EeD0.",
"2. Retry this request with header 'X-PAYMENT-TX: <your tx hash>'.",
"3. That hash is your API key for 25 calls. Reuse it until spent.",
"Payment is verified on-chain by this server. No signup, no key, no account."
],
"x402Version": 1
}
] OVER TIME
All charts use the 30d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/momentum-signals/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.
Median across 2 endpoints. Use the selector to isolate one.
checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression
COMPLIANCE
12/14 checks pass · grade C · failing: declares the current x402 version (2), EIP-712 domain parameters present on every EVM entrylast 402 captured 2026-08-12 · last up 2026-08-12
- 402 payload captured
- accepts[] array present
- payTo address recoverable
- payTo at accepts[0].payTo (conformant shape)
- payTo is a valid on-chain address
- atomic price declared
- atomic price in a sane range
- asset (token) address declared
- network resolves to CAIP-2
- payment scheme declared
- served over HTTPS
- declares the current x402 version (2)
- EIP-712 domain parameters present on every EVM entry
- x402 v2 envelope delivered in the payment-required header
SITE PILLARS
- homepage reachable
- openapi doc
- pricing page
- llms.txt
- robots.txt
- terms page
recent checks (7) live · click to expand
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