Fiber
Fiber · Ranked #11 of 19 in Data Enrichment APIs
Y Combinator-backed API-first B2B data platform (40M+ companies, 850M+ people) with agent-native docs, Node and Python SDKs and three MCP servers, but a $300/month minimum, a card-required trial and thin public track record.
Agent-native sales and recruiting data pipelines
Overview
Fiber (fiber.ai, YC S23) sells search, live enrichment, contact reveal and reverse lookup APIs over a database it claims at 40M+ companies, 850M+ professionals and 30-35M jobs. The API (api.fiber.ai) offers filter and natural-language search (companySearch, peopleSearch, jobPostingSearch, nlpSearchParse), reverse email and phone lookup, quick and exhaustive contact enrichment, live LinkedIn profile and company enrich, bulk audience workflows with cost estimation, and Tracker rules with webhooks. Official SDKs exist for Node (@fiberai/sdk) and Python (fiberai), and MCP servers come in v3 (OAuth), v2 (API key) and a lite variant, plus a first-party plugin.
Docs are notably agent-oriented: interactive docs, per-operation markdown at /ai-docs/<operationId>.md, llms.txt, an openapi.json and per-call cost metadata for spend confirmation. Pricing is public: one credit is $0.02, Prospector $300/month for 15,000 credits, Growth $900/month for 50,000, Enterprise $2,400/month for 150,000, 17% off annually, all with full API access, plus separate bulk-search and dataset subscriptions. Search costs 1 credit per result and contact reveals 2-5 credits.
Weaknesses are access and evidence. There is no free tier, only a 7-day trial; the pricing page says a payment method is required while the homepage advertises a cardless terminal quickstart, an unresolved conflict. The entry price is high for individual developers. Reliability evidence is thin: the company was founded in 2023, no official status page or SLA was confirmed, and only a third-party monitor reported 100% availability on one component as of July 2026. Review coverage is also thin: no verifiable G2 or Trustpilot profile for this product was found (G2 hits were for the unrelated Fibr AI), so sentiment is unscored.
How this score is derived
The APIbenchmarks Index is a weighted sum of four dimensions, each scored on an absolute 0–100 reference scale. See the methodology for every mapping.
| Dimension | Score | Weight | Contribution |
|---|---|---|---|
| Documentation & DXInteractive docs, per-operation markdown, llms.txt, openapi.json, a one-line quickstart, explicit credit-cost rules and agent-oriented guidance; numeric rate limits and long-term changelog were not confirmed, and the vendor is young. | 80 | 30% | 24.0 |
| ReliabilityThin evidence: no official status page or SLA was confirmed, the company dates from 2023, and only one third-party monitor (StatusField, July 2026) reported 100% availability on a single component with no incident history; scored conservatively at the lowest tier here. | 60 | 25% | 15.0 |
| Ecosystem & SDKsOfficial Node and Python SDKs, three MCP servers (OAuth, API key, lite), a first-party plugin, webhooks and an OpenAPI schema are strong for agent builders, but there are few confirmed third-party integrations or CRM connectors. | 74 | 25% | 18.5 |
| AccessibilityPricing is public with full API access on every plan, but there is no free tier, the entry plan is $300/month, and the trial conflicts (card required on the pricing page, cardless quickstart on the homepage), so scored mid-range. | 62 | 20% | 12.4 |
| APIbenchmarks Index (ABI) | 69.9 | ||
Table 1. Derivation of the ABI for Fiber. Contribution = score × weight; the index is their sum.
At a glance
- Vendor
- Fiber
- Pricing model
- Credit-based ($0.02/credit) on monthly plans
- Free tier
- No
- Official SDKs
- 5 languages
Pricing
| Prospector | $300/mo | 15,000 credits; full API access; 17% off annually. |
| Growth | $900/mo | 50,000 credits. |
| Enterprise | $2,400/mo | 150,000 credits. |
| Bulk / datasets | From $1,000/mo (datasets) | High-volume search (500K-unlimited credits) and pre-built datasets from 500K entities. |
| Trial | $0 for 7 days | Full product access; payment method required per pricing page, not charged until day 8. |
Key features
- •Company search and people search (filter-based)
- •Natural-language search (slushieRun, nlpSearchParse)
- •Job posting search
- •Quick and exhaustive contact enrichment
- •Live LinkedIn profile and company enrichment
- •Reverse email and reverse phone lookup
- •Bulk audience workflow with cost estimate
- •Tracker rules and webhooks
- •Node and Python SDKs; MCP servers
Official SDKs
Strengths & trade-offs
- +Official Node (@fiberai/sdk) and Python (fiberai) SDKs
- +Three MCP servers (v3 OAuth, v2 API key, lite) and a first-party plugin
- +Agent-native docs: per-operation markdown, llms.txt and openapi.json
- +Per-call cost metadata and cost estimation before bulk enrichment
- +Public pricing with full API access on all plans
- +Natural-language search and reverse email/phone lookup
- –No free tier; entry plan $300/month
- –Trial requirements conflict between homepage and pricing page
- –No confirmed official status page or SLA
- –Young vendor (founded 2023) with limited public review history
- –Database size figures are vendor claims
- –Contact reveals cost 2-5 credits each
What developers say
No verified G2/Trustpilot profile found
Public reviews for this product could not be located; evidence comes from vendor docs and third-party listings, so sentiment is not scored.
“Fiber positions its docs as agent-native (llms.txt, per-operation markdown, MCP) instead of PDF exports (vendor claim).”
Key figures
| Credit price | $0.02 per credit | Fiber pricing ↗ |
| Entry plan | $300/mo for 15,000 credits | Fiber pricing ↗ |
| Database size (vendor claim) | 40M+ companies, 850M+ people | Fiber homepage ↗ |
| SDKs | Node (@fiberai/sdk), Python (fiberai) | Fiber docs and PyPI ↗ |
| Trial | 7 days, card required per pricing page | Fiber pricing ↗ |
| Third-party availability (single component) | 100% as of July 22, 2026 | StatusField ↗ |
Compare Fiber head to head
Sources
- https://www.fiber.ai/
- https://www.fiber.ai/pricing
- https://api.fiber.ai/docs
- https://api.fiber.ai/llms.txt
- https://pypi.org/project/fiberai/
- https://docs.fiber.ai/article/developing-with-ai-agents
- https://statusfield.com/services/fiber-ai
Figures last verified 2026-10-07. Spotted an error? corrections@apibenchmarks.com