payment-ready until 2026-09-04
Agents buy per-signal bundles via x402 and get pushed (Telegram) the instant a city's daily-high temperature crosses into a new Polymarket bucket — market URL, old/new reading, and live odds for every bucket. 37 cities.
Pay from $0.10 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.
VERDICT
ranking generation 3solid 89/100 #138 of 252 in Data by measured score
What the score read on this service: status online, 100% uptime 30d, 1614ms response p95, x402 compliance 14 of 14, $0.1 price against the category. Each of those is measured, and each is published in full below.
The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.
It is a score inside Data, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 252 listings, this one among them. That set is wider than the 252 the position above is counted against, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.
Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.
ALTERNATIVES IN DATA
Other Data services in this directory, ordered by the same measured score. The figures are ours: 30-day uptime from our own probes, 30-day settlement volume read on-chain (a conservative undercount, and null where we cannot measure it, never a zero).
| SERVICE | BAND | SCORE | UPTIME 30D | VOL 30D |
|---|---|---|---|---|
| WebberSites x402 Data API | strong | 99 | 100% | --- |
| API Acre | strong | 99 | 99.6% | --- |
| MicroTap | strong | 99 | 100% | --- |
| ForgeMesh Utility APIs | strong | 99 | 100% | --- |
| AgentToll | strong | 99 | 100% | --- |
ASSESSMENT
updated 5h agoThe parts the verdict above is computed from, each with its proof. Click any chip. Measured values stay read-only; unknown is honest, and an unknown is never counted as a zero.
reliability 100%
- uptime 24h
- 100%
- uptime 7d
- 100%
- uptime 30d
- 100%
- uptime 90d
- 100%
- response p95
- 1614ms
- avg response
- 471ms
- total checks
- 2,748
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
compliance A (14/14)
14 of 14 x402 conformance checks pass. Full checklist below.
price $0.10 (p93 in Data)
- price (min)
- $0.10
- category percentile (min)
- p93 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
- 54d
- registrar
- Namecheap Inc.
- hosting
- custom
- domain created
- 2026-07-03
Identity facts, not a risk score.
traction ---
This service settles on a network x402-list does not measure yet, so on-chain volume is not counted here. Shown as unmeasured, not zero.
WHAT IT DOES
ai-derivedProvides weather-based market signals for temperature thresholds across different cities.
- category
- weather-market-data
- in
- query params
- auth
- api key
AI-generated summary. The measured data is never altered by it.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET | 402 CHANNEL |
|---|---|---|---|---|---|---|
| GET | /v1/signals | $0.10 | Base | USDC | header | |
| POST | /v1/subscribe | $0.10 | Base | USDC | header |
REQUEST / RESPONSE EXAMPLE
An unpaid request to GET /v1/signals returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i 'https://api.isocast.dev/v1/signals'
// 402 response (captured by monitor) · 2 payloads · click to expand
[
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x44b16952484b6dbea40ede12927ee03a5ea6cdd3",
"amount": "100000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.isocast.dev/v1/subscribe",
"mimeType": "application/json",
"description": "Buy the next N Polymarket weather-signal(s) for a city (bundle prepay, count ≥ 2, $0.01–$7.00). Returns a Bearer receipt for /v1/signals. Nonce binds (payer, citySlug, count)."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"city": "istanbul",
"count": 20
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"ok": true,
"city": "istanbul",
"count": 20,
"amountUsd": 0.1,
"idempotent": false,
"receiptToken": "ic_rcpt_…",
"unitPriceUsd": 0.005,
"paidThroughSeq": 24
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"required": [
"city",
"count"
],
"properties": {
"city": {
"type": "string",
"description": "City slug (see GET /v1/cities), e.g. istanbul, nyc, los-angeles"
},
"count": {
"type": "integer",
"minimum": 2,
"description": "Number of signals to buy (integer ≥ 2, and total ≥ 0.01 USDC min spend)"
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x44b16952484b6dbea40ede12927ee03a5ea6cdd3",
"amount": "100000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.isocast.dev/v1/signals",
"mimeType": "application/json",
"description": "Read entitled Polymarket weather signals for a city; pay inline (x402) or present the Bearer receipt from /v1/subscribe. Each signal: market URL + conditionId, old/new temperature bucket, live odds for every bucket. 402 on exhaustion."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"city": "istanbul"
}
},
"output": {
"type": "json",
"example": {
"more": false,
"latest": 12,
"signals": [
{
"new": {
"unit": "C",
"bucket": "29-30°C",
"reading": 30.1
},
"old": {
"unit": "C",
"bucket": "28-29°C",
"reading": 28.9
},
"seq": 1,
"city": "istanbul",
"buckets": [
{
"no": 0.45,
"yes": 0.55,
"label": "29-30°C"
}
],
"marketUrl": "https://polymarket.com/event/highest-temperature-in-istanbul-on-july-3-2026",
"targetDate": "2026-07-03",
"conditionId": "0x…"
}
],
"next_cursor": 1,
"paid_through": 24
}
}
},
"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": [
"city"
],
"properties": {
"city": {
"type": "string",
"description": "City slug (see GET /v1/cities)"
},
"count": {
"type": "integer",
"default": 20,
"minimum": 2,
"description": "Bundle size proposed in the 402 challenge if payment is required"
},
"since": {
"type": "integer",
"default": 0,
"minimum": 0,
"description": "Return signals with seq strictly greater than this (cursor)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}
] OVER TIME
All charts use the 7d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/isocast/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
Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.
COMPLIANCE
14/14 checks pass · grade Alast 402 captured 2026-07-14 · last up 2026-08-28
- 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 (18) live · click to expand
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